We (the -stable team) are announcing the release of the 2.6.26.2
kernel.
It contains lots of bugfixes, all over the map. Any users of the 2.6.26
kernel series should upgrade to this version. For details on the fixes,
see the changelog entries and the diffstat below.
I'll also be replying to this message with a copy of the patch between
2.6.26.1 and 2.6.26.2
The updated 2.6.26.y git tree can be found at:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-2.6.26.y.git
and can be browsed at the normal kernel.org git web browser:
http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.26.y.git;a=summary
thanks,
greg k-h
-------------
Documentation/ftrace.txt | 1353 ----------------------------------
Makefile | 2
arch/powerpc/kernel/ppc32.h | 2
arch/powerpc/kernel/ptrace32.c | 27
arch/x86/kernel/io_delay.c | 3
arch/x86/kernel/kprobes.c | 1
arch/x86/kernel/process.c | 3
block/bsg.c | 9
drivers/input/serio/i8042-x86ia64io.h | 43 -
drivers/md/linear.c | 2
drivers/md/md.c | 2
drivers/net/wireless/ath5k/base.c | 35
drivers/net/wireless/ath5k/base.h | 2
drivers/scsi/ch.c | 1
fs/jbd/transaction.c | 57 +
fs/namei.c | 19
fs/nfs/inode.c | 4
fs/nfs/internal.h | 1
fs/nfs/nfs3acl.c | 9
fs/nfs/nfs4proc.c | 5
fs/romfs/inode.c | 37
include/sound/emu10k1.h | 1
mm/filemap.c | 3
net/bluetooth/bnep/core.c | 5
net/bluetooth/hidp/core.c | 10
net/ipv4/netfilter/nf_nat_sip.c | 38
net/netfilter/xt_time.c | 2
sound/core/seq/oss/seq_oss_synth.c | 3
sound/pci/emu10k1/emu10k1_main.c | 1
sound/pci/emu10k1/emumixer.c | 13
sound/pci/hda/hda_intel.c | 124 ++-
sound/pci/hda/patch_analog.c | 33
32 files changed, 398 insertions(+), 1452 deletions(-)
Andreas Schwab (1):
Add compat handler for PTRACE_GETSIGINFO
Cyrill Gorcunov (2):
x86: idle process - add checking for NULL early param
x86: io delay - add checking for NULL early param
David Howells (1):
netfilter: xt_time: fix time's time_mt()'s use of do_div()
FUJITA Tomonori (2):
SCSI: bsg: fix bsg_mutex hang with device removal
SCSI: ch: fix ch_remove oops
Greg Kroah-Hartman (2):
ftrace: remove unneeded documentation
Linux 2.6.26.2
Herbert Xu (1):
netfilter: nf_nat_sip: c= is optional for session
Jiri Kosina (3):
Input: i8042 - add Intel D845PESV to nopnp list
Input: i8042 - add Gericom Bellagio to nomux blacklist
Input: i8042 - add Acer Aspire 1360 to nomux blacklist
Jiri Slaby (2):
Ath5k: fix memory corruption
Ath5k: kill tasklets on shutdown
Linus Torvalds (1):
romfs_readpage: don't report errors for pages beyond i_size
Marcel Holtmann (1):
Bluetooth: Signal user-space for HIDP and BNEP socket errors
Miklos Szeredi (1):
vfs: fix lookup on deleted directory
Mingming Cao (1):
jbd: fix race between free buffer and commit transaction
Neil Brown (1):
Close race in md_probe
Nikanth Karthikesan (1):
linear: correct disk numbering error check
Peter Zijlstra (1):
Kprobe smoke test lockdep warning
Takashi Iwai (4):
ALSA: hda - Fix wrong volumes in AD1988 auto-probe mode
ALSA: hda - Fix DMA position inaccuracy
ALSA: hda - Add missing Thinkpad Z60m support
ALSA: emu10k1 - Fix inverted Analog/Digital mixer switch on Audigy2
Trond Myklebust (1):
NFS: Ensure we zap only the access and acl caches when setting new acls
Willy Tarreau (1):
sound: ensure device number is valid in snd_seq_oss_synth_make_info
diff --git a/Documentation/ftrace.txt b/Documentation/ftrace.txt
deleted file mode 100644
index 13e4bf0..0000000
--- a/Documentation/ftrace.txt
+++ /dev/null
@@ -1,1353 +0,0 @@
- ftrace - Function Tracer
- ========================
-
-Copyright 2008 Red Hat Inc.
-Author: Steven Rostedt <[email protected]>
-
-
-Introduction
-------------
-
-Ftrace is an internal tracer designed to help out developers and
-designers of systems to find what is going on inside the kernel.
-It can be used for debugging or analyzing latencies and performance
-issues that take place outside of user-space.
-
-Although ftrace is the function tracer, it also includes an
-infrastructure that allows for other types of tracing. Some of the
-tracers that are currently in ftrace is a tracer to trace
-context switches, the time it takes for a high priority task to
-run after it was woken up, the time interrupts are disabled, and
-more.
-
-
-The File System
----------------
-
-Ftrace uses the debugfs file system to hold the control files as well
-as the files to display output.
-
-To mount the debugfs system:
-
- # mkdir /debug
- # mount -t debugfs nodev /debug
-
-
-That's it! (assuming that you have ftrace configured into your kernel)
-
-After mounting the debugfs, you can see a directory called
-"tracing". This directory contains the control and output files
-of ftrace. Here is a list of some of the key files:
-
-
- Note: all time values are in microseconds.
-
- current_tracer : This is used to set or display the current tracer
- that is configured.
-
- available_tracers : This holds the different types of tracers that
- has been compiled into the kernel. The tracers
- listed here can be configured by echoing in their
- name into current_tracer.
-
- tracing_enabled : This sets or displays whether the current_tracer
- is activated and tracing or not. Echo 0 into this
- file to disable the tracer or 1 (or non-zero) to
- enable it.
-
- trace : This file holds the output of the trace in a human readable
- format.
-
- latency_trace : This file shows the same trace but the information
- is organized more to display possible latencies
- in the system.
-
- trace_pipe : The output is the same as the "trace" file but this
- file is meant to be streamed with live tracing.
- Reads from this file will block until new data
- is retrieved. Unlike the "trace" and "latency_trace"
- files, this file is a consumer. This means reading
- from this file causes sequential reads to display
- more current data. Once data is read from this
- file, it is consumed, and will not be read
- again with a sequential read. The "trace" and
- "latency_trace" files are static, and if the
- tracer isn't adding more data, they will display
- the same information every time they are read.
-
- iter_ctrl : This file lets the user control the amount of data
- that is displayed in one of the above output
- files.
-
- trace_max_latency : Some of the tracers record the max latency.
- For example, the time interrupts are disabled.
- This time is saved in this file. The max trace
- will also be stored, and displayed by either
- "trace" or "latency_trace". A new max trace will
- only be recorded if the latency is greater than
- the value in this file. (in microseconds)
-
- trace_entries : This sets or displays the number of trace
- entries each CPU buffer can hold. The tracer buffers
- are the same size for each CPU, so care must be
- taken when modifying the trace_entries. The number
- of actually entries will be the number given
- times the number of possible CPUS. The buffers
- are saved as individual pages, and the actual entries
- will always be rounded up to entries per page.
-
- This can only be updated when the current_tracer
- is set to "none".
-
- NOTE: It is planned on changing the allocated buffers
- from being the number of possible CPUS to
- the number of online CPUS.
-
- tracing_cpumask : This is a mask that lets the user only trace
- on specified CPUS. The format is a hex string
- representing the CPUS.
-
- set_ftrace_filter : When dynamic ftrace is configured in, the
- code is dynamically modified to disable calling
- of the function profiler (mcount). This lets
- tracing be configured in with practically no overhead
- in performance. This also has a side effect of
- enabling or disabling specific functions to be
- traced. Echoing in names of functions into this
- file will limit the trace to only those files.
-
- set_ftrace_notrace: This has the opposite effect that
- set_ftrace_filter has. Any function that is added
- here will not be traced. If a function exists
- in both set_ftrace_filter and set_ftrace_notrace
- the function will _not_ bet traced.
-
- available_filter_functions : When a function is encountered the first
- time by the dynamic tracer, it is recorded and
- later the call is converted into a nop. This file
- lists the functions that have been recorded
- by the dynamic tracer and these functions can
- be used to set the ftrace filter by the above
- "set_ftrace_filter" file.
-
-
-The Tracers
------------
-
-Here are the list of current tracers that can be configured.
-
- ftrace - function tracer that uses mcount to trace all functions.
- It is possible to filter out which functions that are
- traced when dynamic ftrace is configured in.
-
- sched_switch - traces the context switches between tasks.
-
- irqsoff - traces the areas that disable interrupts and saves off
- the trace with the longest max latency.
- See tracing_max_latency. When a new max is recorded,
- it replaces the old trace. It is best to view this
- trace with the latency_trace file.
-
- preemptoff - Similar to irqsoff but traces and records the time
- preemption is disabled.
-
- preemptirqsoff - Similar to irqsoff and preemptoff, but traces and
- records the largest time irqs and/or preemption is
- disabled.
-
- wakeup - Traces and records the max latency that it takes for
- the highest priority task to get scheduled after
- it has been woken up.
-
- none - This is not a tracer. To remove all tracers from tracing
- simply echo "none" into current_tracer.
-
-
-Examples of using the tracer
-----------------------------
-
-Here are typical examples of using the tracers with only controlling
-them with the debugfs interface (without using any user-land utilities).
-
-Output format:
---------------
-
-Here's an example of the output format of the file "trace"
-
- --------
-# tracer: ftrace
-#
-# TASK-PID CPU# TIMESTAMP FUNCTION
-# | | | | |
- bash-4251 [01] 10152.583854: path_put <-path_walk
- bash-4251 [01] 10152.583855: dput <-path_put
- bash-4251 [01] 10152.583855: _atomic_dec_and_lock <-dput
- --------
-
-A header is printed with the trace that is represented. In this case
-the tracer is "ftrace". Then a header showing the format. Task name
-"bash", the task PID "4251", the CPU that it was running on
-"01", the timestamp in <secs>.<usecs> format, the function name that was
-traced "path_put" and the parent function that called this function
-"path_walk".
-
-The sched_switch tracer also includes tracing of task wake ups and
-context switches.
-
- ksoftirqd/1-7 [01] 1453.070013: 7:115:R + 2916:115:S
- ksoftirqd/1-7 [01] 1453.070013: 7:115:R + 10:115:S
- ksoftirqd/1-7 [01] 1453.070013: 7:115:R ==> 10:115:R
- events/1-10 [01] 1453.070013: 10:115:S ==> 2916:115:R
- kondemand/1-2916 [01] 1453.070013: 2916:115:S ==> 7:115:R
- ksoftirqd/1-7 [01] 1453.070013: 7:115:S ==> 0:140:R
-
-Wake ups are represented by a "+" and the context switches show
-"==>". The format is:
-
- Context switches:
-
- Previous task Next Task
-
- <pid>:<prio>:<state> ==> <pid>:<prio>:<state>
-
- Wake ups:
-
- Current task Task waking up
-
- <pid>:<prio>:<state> + <pid>:<prio>:<state>
-
-The prio is the internal kernel priority, which is inverse to the
-priority that is usually displayed by user-space tools. Zero represents
-the highest priority (99). Prio 100 starts the "nice" priorities with
-100 being equal to nice -20 and 139 being nice 19. The prio "140" is
-reserved for the idle task which is the lowest priority thread (pid 0).
-
-
-Latency trace format
---------------------
-
-For traces that display latency times, the latency_trace file gives
-a bit more information to see why a latency happened. Here's a typical
-trace.
-
-# tracer: irqsoff
-#
-irqsoff latency trace v1.1.5 on 2.6.26-rc8
---------------------------------------------------------------------
- latency: 97 us, #3/3, CPU#0 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:2)
- -----------------
- | task: swapper-0 (uid:0 nice:0 policy:0 rt_prio:0)
- -----------------
- => started at: apic_timer_interrupt
- => ended at: do_softirq
-
-# _------=> CPU#
-# / _-----=> irqs-off
-# | / _----=> need-resched
-# || / _---=> hardirq/softirq
-# ||| / _--=> preempt-depth
-# |||| /
-# ||||| delay
-# cmd pid ||||| time | caller
-# \ / ||||| \ | /
- <idle>-0 0d..1 0us+: trace_hardirqs_off_thunk (apic_timer_interrupt)
- <idle>-0 0d.s. 97us : __do_softirq (do_softirq)
- <idle>-0 0d.s1 98us : trace_hardirqs_on (do_softirq)
-
-
-vim:ft=help
-
-
-This shows that the current tracer is "irqsoff" tracing the time
-interrupts are disabled. It gives the trace version and the kernel
-this was executed on (2.6.26-rc8). Then it displays the max latency
-in microsecs (97 us). The number of trace entries displayed
-by the total number recorded (both are three: #3/3). The type of
-preemption that was used (PREEMPT). VP, KP, SP, and HP are always zero
-and reserved for later use. #P is the number of online CPUS (#P:2).
-
-The task is the process that was running when the latency happened.
-(swapper pid: 0).
-
-The start and stop that caused the latencies:
-
- apic_timer_interrupt is where the interrupts were disabled.
- do_softirq is where they were enabled again.
-
-The next lines after the header are the trace itself. The header
-explains which is which.
-
- cmd: The name of the process in the trace.
-
- pid: The PID of that process.
-
- CPU#: The CPU that the process was running on.
-
- irqs-off: 'd' interrupts are disabled. '.' otherwise.
-
- need-resched: 'N' task need_resched is set, '.' otherwise.
-
- hardirq/softirq:
- 'H' - hard irq happened inside a softirq.
- 'h' - hard irq is running
- 's' - soft irq is running
- '.' - normal context.
-
- preempt-depth: The level of preempt_disabled
-
-The above is mostly meaningful for kernel developers.
-
- time: This differs from the trace output where as the trace output
- contained a absolute timestamp. This timestamp is relative
- to the start of the first entry in the the trace.
-
- delay: This is just to help catch your eye a bit better. And
- needs to be fixed to be only relative to the same CPU.
- The marks is determined by the difference between this
- current trace and the next trace.
- '!' - greater than preempt_mark_thresh (default 100)
- '+' - greater than 1 microsecond
- ' ' - less than or equal to 1 microsecond.
-
- The rest is the same as the 'trace' file.
-
-
-iter_ctrl
----------
-
-The iter_ctrl file is used to control what gets printed in the trace
-output. To see what is available, simply cat the file:
-
- cat /debug/tracing/iter_ctrl
- print-parent nosym-offset nosym-addr noverbose noraw nohex nobin \
- noblock nostacktrace nosched-tree
-
-To disable one of the options, echo in the option appended with "no".
-
- echo noprint-parent > /debug/tracing/iter_ctrl
-
-To enable an option, leave off the "no".
-
- echo sym-offest > /debug/tracing/iter_ctrl
-
-Here are the available options:
-
- print-parent - On function traces, display the calling function
- as well as the function being traced.
-
- print-parent:
- bash-4000 [01] 1477.606694: simple_strtoul <-strict_strtoul
-
- noprint-parent:
- bash-4000 [01] 1477.606694: simple_strtoul
-
-
- sym-offset - Display not only the function name, but also the offset
- in the function. For example, instead of seeing just
- "ktime_get" you will see "ktime_get+0xb/0x20"
-
- sym-offset:
- bash-4000 [01] 1477.606694: simple_strtoul+0x6/0xa0
-
- sym-addr - this will also display the function address as well as
- the function name.
-
- sym-addr:
- bash-4000 [01] 1477.606694: simple_strtoul <c0339346>
-
- verbose - This deals with the latency_trace file.
-
- bash 4000 1 0 00000000 00010a95 [58127d26] 1720.415ms \
- (+0.000ms): simple_strtoul (strict_strtoul)
-
- raw - This will display raw numbers. This option is best for use with
- user applications that can translate the raw numbers better than
- having it done in the kernel.
-
- hex - similar to raw, but the numbers will be in a hexadecimal format.
-
- bin - This will print out the formats in raw binary.
-
- block - TBD (needs update)
-
- stacktrace - This is one of the options that changes the trace itself.
- When a trace is recorded, so is the stack of functions.
- This allows for back traces of trace sites.
-
- sched-tree - TBD (any users??)
-
-
-sched_switch
-------------
-
-This tracer simply records schedule switches. Here's an example
-on how to implement it.
-
- # echo sched_switch > /debug/tracing/current_tracer
- # echo 1 > /debug/tracing/tracing_enabled
- # sleep 1
- # echo 0 > /debug/tracing/tracing_enabled
- # cat /debug/tracing/trace
-
-# tracer: sched_switch
-#
-# TASK-PID CPU# TIMESTAMP FUNCTION
-# | | | | |
- bash-3997 [01] 240.132281: 3997:120:R + 4055:120:R
- bash-3997 [01] 240.132284: 3997:120:R ==> 4055:120:R
- sleep-4055 [01] 240.132371: 4055:120:S ==> 3997:120:R
- bash-3997 [01] 240.132454: 3997:120:R + 4055:120:S
- bash-3997 [01] 240.132457: 3997:120:R ==> 4055:120:R
- sleep-4055 [01] 240.132460: 4055:120:D ==> 3997:120:R
- bash-3997 [01] 240.132463: 3997:120:R + 4055:120:D
- bash-3997 [01] 240.132465: 3997:120:R ==> 4055:120:R
- <idle>-0 [00] 240.132589: 0:140:R + 4:115:S
- <idle>-0 [00] 240.132591: 0:140:R ==> 4:115:R
- ksoftirqd/0-4 [00] 240.132595: 4:115:S ==> 0:140:R
- <idle>-0 [00] 240.132598: 0:140:R + 4:115:S
- <idle>-0 [00] 240.132599: 0:140:R ==> 4:115:R
- ksoftirqd/0-4 [00] 240.132603: 4:115:S ==> 0:140:R
- sleep-4055 [01] 240.133058: 4055:120:S ==> 3997:120:R
- [...]
-
-
-As we have discussed previously about this format, the header shows
-the name of the trace and points to the options. The "FUNCTION"
-is a misnomer since here it represents the wake ups and context
-switches.
-
-The sched_switch only lists the wake ups (represented with '+')
-and context switches ('==>') with the previous task or current
-first followed by the next task or task waking up. The format for both
-of these is PID:KERNEL-PRIO:TASK-STATE. Remember that the KERNEL-PRIO
-is the inverse of the actual priority with zero (0) being the highest
-priority and the nice values starting at 100 (nice -20). Below is
-a quick chart to map the kernel priority to user land priorities.
-
- Kernel priority: 0 to 99 ==> user RT priority 99 to 0
- Kernel priority: 100 to 139 ==> user nice -20 to 19
- Kernel priority: 140 ==> idle task priority
-
-The task states are:
-
- R - running : wants to run, may not actually be running
- S - sleep : process is waiting to be woken up (handles signals)
- D - deep sleep : process must be woken up (ignores signals)
- T - stopped : process suspended
- t - traced : process is being traced (with something like gdb)
- Z - zombie : process waiting to be cleaned up
- X - unknown
-
-
-ftrace_enabled
---------------
-
-The following tracers give different output depending on whether
-or not the sysctl ftrace_enabled is set. To set ftrace_enabled,
-one can either use the sysctl function or set it via the proc
-file system interface.
-
- sysctl kernel.ftrace_enabled=1
-
- or
-
- echo 1 > /proc/sys/kernel/ftrace_enabled
-
-To disable ftrace_enabled simply replace the '1' with '0' in
-the above commands.
-
-When ftrace_enabled is set the tracers will also record the functions
-that are within the trace. The descriptions of the tracers
-will also show an example with ftrace enabled.
-
-
-irqsoff
--------
-
-When interrupts are disabled, the CPU can not react to any other
-external event (besides NMIs and SMIs). This prevents the timer
-interrupt from triggering or the mouse interrupt from letting the
-kernel know of a new mouse event. The result is a latency with the
-reaction time.
-
-The irqsoff tracer tracks the time interrupts are disabled and when
-they are re-enabled. When a new maximum latency is hit, it saves off
-the trace so that it may be retrieved at a later time. Every time a
-new maximum in reached, the old saved trace is discarded and the new
-trace is saved.
-
-To reset the maximum, echo 0 into tracing_max_latency. Here's an
-example:
-
- # echo irqsoff > /debug/tracing/current_tracer
- # echo 0 > /debug/tracing/tracing_max_latency
- # echo 1 > /debug/tracing/tracing_enabled
- # ls -ltr
- [...]
- # echo 0 > /debug/tracing/tracing_enabled
- # cat /debug/tracing/latency_trace
-# tracer: irqsoff
-#
-irqsoff latency trace v1.1.5 on 2.6.26-rc8
---------------------------------------------------------------------
- latency: 6 us, #3/3, CPU#1 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:2)
- -----------------
- | task: bash-4269 (uid:0 nice:0 policy:0 rt_prio:0)
- -----------------
- => started at: copy_page_range
- => ended at: copy_page_range
-
-# _------=> CPU#
-# / _-----=> irqs-off
-# | / _----=> need-resched
-# || / _---=> hardirq/softirq
-# ||| / _--=> preempt-depth
-# |||| /
-# ||||| delay
-# cmd pid ||||| time | caller
-# \ / ||||| \ | /
- bash-4269 1...1 0us+: _spin_lock (copy_page_range)
- bash-4269 1...1 7us : _spin_unlock (copy_page_range)
- bash-4269 1...2 7us : trace_preempt_on (copy_page_range)
-
-
-vim:ft=help
-
-Here we see that that we had a latency of 6 microsecs (which is
-very good). The spin_lock in copy_page_range disabled interrupts.
-The difference between the 6 and the displayed timestamp 7us is
-because the clock must have incremented between the time of recording
-the max latency and recording the function that had that latency.
-
-Note the above had ftrace_enabled not set. If we set the ftrace_enabled
-we get a much larger output:
-
-# tracer: irqsoff
-#
-irqsoff latency trace v1.1.5 on 2.6.26-rc8
---------------------------------------------------------------------
- latency: 50 us, #101/101, CPU#0 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:2)
- -----------------
- | task: ls-4339 (uid:0 nice:0 policy:0 rt_prio:0)
- -----------------
- => started at: __alloc_pages_internal
- => ended at: __alloc_pages_internal
-
-# _------=> CPU#
-# / _-----=> irqs-off
-# | / _----=> need-resched
-# || / _---=> hardirq/softirq
-# ||| / _--=> preempt-depth
-# |||| /
-# ||||| delay
-# cmd pid ||||| time | caller
-# \ / ||||| \ | /
- ls-4339 0...1 0us+: get_page_from_freelist (__alloc_pages_internal)
- ls-4339 0d..1 3us : rmqueue_bulk (get_page_from_freelist)
- ls-4339 0d..1 3us : _spin_lock (rmqueue_bulk)
- ls-4339 0d..1 4us : add_preempt_count (_spin_lock)
- ls-4339 0d..2 4us : __rmqueue (rmqueue_bulk)
- ls-4339 0d..2 5us : __rmqueue_smallest (__rmqueue)
- ls-4339 0d..2 5us : __mod_zone_page_state (__rmqueue_smallest)
- ls-4339 0d..2 6us : __rmqueue (rmqueue_bulk)
- ls-4339 0d..2 6us : __rmqueue_smallest (__rmqueue)
- ls-4339 0d..2 7us : __mod_zone_page_state (__rmqueue_smallest)
- ls-4339 0d..2 7us : __rmqueue (rmqueue_bulk)
- ls-4339 0d..2 8us : __rmqueue_smallest (__rmqueue)
-[...]
- ls-4339 0d..2 46us : __rmqueue_smallest (__rmqueue)
- ls-4339 0d..2 47us : __mod_zone_page_state (__rmqueue_smallest)
- ls-4339 0d..2 47us : __rmqueue (rmqueue_bulk)
- ls-4339 0d..2 48us : __rmqueue_smallest (__rmqueue)
- ls-4339 0d..2 48us : __mod_zone_page_state (__rmqueue_smallest)
- ls-4339 0d..2 49us : _spin_unlock (rmqueue_bulk)
- ls-4339 0d..2 49us : sub_preempt_count (_spin_unlock)
- ls-4339 0d..1 50us : get_page_from_freelist (__alloc_pages_internal)
- ls-4339 0d..2 51us : trace_hardirqs_on (__alloc_pages_internal)
-
-
-vim:ft=help
-
-
-Here we traced a 50 microsecond latency. But we also see all the
-functions that were called during that time. Note that enabling
-function tracing we endure an added overhead. This overhead may
-extend the latency times. But never the less, this trace has provided
-some very helpful debugging.
-
-
-preemptoff
-----------
-
-When preemption is disabled we may be able to receive interrupts but
-the task can not be preempted and a higher priority task must wait
-for preemption to be enabled again before it can preempt a lower
-priority task.
-
-The preemptoff tracer traces the places that disables preemption.
-Like the irqsoff, it records the maximum latency that preemption
-was disabled. The control of preemptoff is much like the irqsoff.
-
- # echo preemptoff > /debug/tracing/current_tracer
- # echo 0 > /debug/tracing/tracing_max_latency
- # echo 1 > /debug/tracing/tracing_enabled
- # ls -ltr
- [...]
- # echo 0 > /debug/tracing/tracing_enabled
- # cat /debug/tracing/latency_trace
-# tracer: preemptoff
-#
-preemptoff latency trace v1.1.5 on 2.6.26-rc8
---------------------------------------------------------------------
- latency: 29 us, #3/3, CPU#0 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:2)
- -----------------
- | task: sshd-4261 (uid:0 nice:0 policy:0 rt_prio:0)
- -----------------
- => started at: do_IRQ
- => ended at: __do_softirq
-
-# _------=> CPU#
-# / _-----=> irqs-off
-# | / _----=> need-resched
-# || / _---=> hardirq/softirq
-# ||| / _--=> preempt-depth
-# |||| /
-# ||||| delay
-# cmd pid ||||| time | caller
-# \ / ||||| \ | /
- sshd-4261 0d.h. 0us+: irq_enter (do_IRQ)
- sshd-4261 0d.s. 29us : _local_bh_enable (__do_softirq)
- sshd-4261 0d.s1 30us : trace_preempt_on (__do_softirq)
-
-
-vim:ft=help
-
-This has some more changes. Preemption was disabled when an interrupt
-came in (notice the 'h'), and was enabled while doing a softirq.
-(notice the 's'). But we also see that interrupts have been disabled
-when entering the preempt off section and leaving it (the 'd').
-We do not know if interrupts were enabled in the mean time.
-
-# tracer: preemptoff
-#
-preemptoff latency trace v1.1.5 on 2.6.26-rc8
---------------------------------------------------------------------
- latency: 63 us, #87/87, CPU#0 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:2)
- -----------------
- | task: sshd-4261 (uid:0 nice:0 policy:0 rt_prio:0)
- -----------------
- => started at: remove_wait_queue
- => ended at: __do_softirq
-
-# _------=> CPU#
-# / _-----=> irqs-off
-# | / _----=> need-resched
-# || / _---=> hardirq/softirq
-# ||| / _--=> preempt-depth
-# |||| /
-# ||||| delay
-# cmd pid ||||| time | caller
-# \ / ||||| \ | /
- sshd-4261 0d..1 0us : _spin_lock_irqsave (remove_wait_queue)
- sshd-4261 0d..1 1us : _spin_unlock_irqrestore (remove_wait_queue)
- sshd-4261 0d..1 2us : do_IRQ (common_interrupt)
- sshd-4261 0d..1 2us : irq_enter (do_IRQ)
- sshd-4261 0d..1 2us : idle_cpu (irq_enter)
- sshd-4261 0d..1 3us : add_preempt_count (irq_enter)
- sshd-4261 0d.h1 3us : idle_cpu (irq_enter)
- sshd-4261 0d.h. 4us : handle_fasteoi_irq (do_IRQ)
-[...]
- sshd-4261 0d.h. 12us : add_preempt_count (_spin_lock)
- sshd-4261 0d.h1 12us : ack_ioapic_quirk_irq (handle_fasteoi_irq)
- sshd-4261 0d.h1 13us : move_native_irq (ack_ioapic_quirk_irq)
- sshd-4261 0d.h1 13us : _spin_unlock (handle_fasteoi_irq)
- sshd-4261 0d.h1 14us : sub_preempt_count (_spin_unlock)
- sshd-4261 0d.h1 14us : irq_exit (do_IRQ)
- sshd-4261 0d.h1 15us : sub_preempt_count (irq_exit)
- sshd-4261 0d..2 15us : do_softirq (irq_exit)
- sshd-4261 0d... 15us : __do_softirq (do_softirq)
- sshd-4261 0d... 16us : __local_bh_disable (__do_softirq)
- sshd-4261 0d... 16us+: add_preempt_count (__local_bh_disable)
- sshd-4261 0d.s4 20us : add_preempt_count (__local_bh_disable)
- sshd-4261 0d.s4 21us : sub_preempt_count (local_bh_enable)
- sshd-4261 0d.s5 21us : sub_preempt_count (local_bh_enable)
-[...]
- sshd-4261 0d.s6 41us : add_preempt_count (__local_bh_disable)
- sshd-4261 0d.s6 42us : sub_preempt_count (local_bh_enable)
- sshd-4261 0d.s7 42us : sub_preempt_count (local_bh_enable)
- sshd-4261 0d.s5 43us : add_preempt_count (__local_bh_disable)
- sshd-4261 0d.s5 43us : sub_preempt_count (local_bh_enable_ip)
- sshd-4261 0d.s6 44us : sub_preempt_count (local_bh_enable_ip)
- sshd-4261 0d.s5 44us : add_preempt_count (__local_bh_disable)
- sshd-4261 0d.s5 45us : sub_preempt_count (local_bh_enable)
-[...]
- sshd-4261 0d.s. 63us : _local_bh_enable (__do_softirq)
- sshd-4261 0d.s1 64us : trace_preempt_on (__do_softirq)
-
-
-The above is an example of the preemptoff trace with ftrace_enabled
-set. Here we see that interrupts were disabled the entire time.
-The irq_enter code lets us know that we entered an interrupt 'h'.
-Before that, the functions being traced still show that it is not
-in an interrupt, but we can see by the functions themselves that
-this is not the case.
-
-Notice that the __do_softirq when called doesn't have a preempt_count.
-It may seem that we missed a preempt enabled. What really happened
-is that the preempt count is held on the threads stack and we
-switched to the softirq stack (4K stacks in effect). The code
-does not copy the preempt count, but because interrupts are disabled
-we don't need to worry about it. Having a tracer like this is good
-to let people know what really happens inside the kernel.
-
-
-preemptirqsoff
---------------
-
-Knowing the locations that have interrupts disabled or preemption
-disabled for the longest times is helpful. But sometimes we would
-like to know when either preemption and/or interrupts are disabled.
-
-The following code:
-
- local_irq_disable();
- call_function_with_irqs_off();
- preempt_disable();
- call_function_with_irqs_and_preemption_off();
- local_irq_enable();
- call_function_with_preemption_off();
- preempt_enable();
-
-The irqsoff tracer will record the total length of
-call_function_with_irqs_off() and
-call_function_with_irqs_and_preemption_off().
-
-The preemptoff tracer will record the total length of
-call_function_with_irqs_and_preemption_off() and
-call_function_with_preemption_off().
-
-But neither will trace the time that interrupts and/or preemption
-is disabled. This total time is the time that we can not schedule.
-To record this time, use the preemptirqsoff tracer.
-
-Again, using this trace is much like the irqsoff and preemptoff tracers.
-
- # echo preemptoff > /debug/tracing/current_tracer
- # echo 0 > /debug/tracing/tracing_max_latency
- # echo 1 > /debug/tracing/tracing_enabled
- # ls -ltr
- [...]
- # echo 0 > /debug/tracing/tracing_enabled
- # cat /debug/tracing/latency_trace
-# tracer: preemptirqsoff
-#
-preemptirqsoff latency trace v1.1.5 on 2.6.26-rc8
---------------------------------------------------------------------
- latency: 293 us, #3/3, CPU#0 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:2)
- -----------------
- | task: ls-4860 (uid:0 nice:0 policy:0 rt_prio:0)
- -----------------
- => started at: apic_timer_interrupt
- => ended at: __do_softirq
-
-# _------=> CPU#
-# / _-----=> irqs-off
-# | / _----=> need-resched
-# || / _---=> hardirq/softirq
-# ||| / _--=> preempt-depth
-# |||| /
-# ||||| delay
-# cmd pid ||||| time | caller
-# \ / ||||| \ | /
- ls-4860 0d... 0us!: trace_hardirqs_off_thunk (apic_timer_interrupt)
- ls-4860 0d.s. 294us : _local_bh_enable (__do_softirq)
- ls-4860 0d.s1 294us : trace_preempt_on (__do_softirq)
-
-
-vim:ft=help
-
-
-The trace_hardirqs_off_thunk is called from assembly on x86 when
-interrupts are disabled in the assembly code. Without the function
-tracing, we don't know if interrupts were enabled within the preemption
-points. We do see that it started with preemption enabled.
-
-Here is a trace with ftrace_enabled set:
-
-
-# tracer: preemptirqsoff
-#
-preemptirqsoff latency trace v1.1.5 on 2.6.26-rc8
---------------------------------------------------------------------
- latency: 105 us, #183/183, CPU#0 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:2)
- -----------------
- | task: sshd-4261 (uid:0 nice:0 policy:0 rt_prio:0)
- -----------------
- => started at: write_chan
- => ended at: __do_softirq
-
-# _------=> CPU#
-# / _-----=> irqs-off
-# | / _----=> need-resched
-# || / _---=> hardirq/softirq
-# ||| / _--=> preempt-depth
-# |||| /
-# ||||| delay
-# cmd pid ||||| time | caller
-# \ / ||||| \ | /
- ls-4473 0.N.. 0us : preempt_schedule (write_chan)
- ls-4473 0dN.1 1us : _spin_lock (schedule)
- ls-4473 0dN.1 2us : add_preempt_count (_spin_lock)
- ls-4473 0d..2 2us : put_prev_task_fair (schedule)
-[...]
- ls-4473 0d..2 13us : set_normalized_timespec (ktime_get_ts)
- ls-4473 0d..2 13us : __switch_to (schedule)
- sshd-4261 0d..2 14us : finish_task_switch (schedule)
- sshd-4261 0d..2 14us : _spin_unlock_irq (finish_task_switch)
- sshd-4261 0d..1 15us : add_preempt_count (_spin_lock_irqsave)
- sshd-4261 0d..2 16us : _spin_unlock_irqrestore (hrtick_set)
- sshd-4261 0d..2 16us : do_IRQ (common_interrupt)
- sshd-4261 0d..2 17us : irq_enter (do_IRQ)
- sshd-4261 0d..2 17us : idle_cpu (irq_enter)
- sshd-4261 0d..2 18us : add_preempt_count (irq_enter)
- sshd-4261 0d.h2 18us : idle_cpu (irq_enter)
- sshd-4261 0d.h. 18us : handle_fasteoi_irq (do_IRQ)
- sshd-4261 0d.h. 19us : _spin_lock (handle_fasteoi_irq)
- sshd-4261 0d.h. 19us : add_preempt_count (_spin_lock)
- sshd-4261 0d.h1 20us : _spin_unlock (handle_fasteoi_irq)
- sshd-4261 0d.h1 20us : sub_preempt_count (_spin_unlock)
-[...]
- sshd-4261 0d.h1 28us : _spin_unlock (handle_fasteoi_irq)
- sshd-4261 0d.h1 29us : sub_preempt_count (_spin_unlock)
- sshd-4261 0d.h2 29us : irq_exit (do_IRQ)
- sshd-4261 0d.h2 29us : sub_preempt_count (irq_exit)
- sshd-4261 0d..3 30us : do_softirq (irq_exit)
- sshd-4261 0d... 30us : __do_softirq (do_softirq)
- sshd-4261 0d... 31us : __local_bh_disable (__do_softirq)
- sshd-4261 0d... 31us+: add_preempt_count (__local_bh_disable)
- sshd-4261 0d.s4 34us : add_preempt_count (__local_bh_disable)
-[...]
- sshd-4261 0d.s3 43us : sub_preempt_count (local_bh_enable_ip)
- sshd-4261 0d.s4 44us : sub_preempt_count (local_bh_enable_ip)
- sshd-4261 0d.s3 44us : smp_apic_timer_interrupt (apic_timer_interrupt)
- sshd-4261 0d.s3 45us : irq_enter (smp_apic_timer_interrupt)
- sshd-4261 0d.s3 45us : idle_cpu (irq_enter)
- sshd-4261 0d.s3 46us : add_preempt_count (irq_enter)
- sshd-4261 0d.H3 46us : idle_cpu (irq_enter)
- sshd-4261 0d.H3 47us : hrtimer_interrupt (smp_apic_timer_interrupt)
- sshd-4261 0d.H3 47us : ktime_get (hrtimer_interrupt)
-[...]
- sshd-4261 0d.H3 81us : tick_program_event (hrtimer_interrupt)
- sshd-4261 0d.H3 82us : ktime_get (tick_program_event)
- sshd-4261 0d.H3 82us : ktime_get_ts (ktime_get)
- sshd-4261 0d.H3 83us : getnstimeofday (ktime_get_ts)
- sshd-4261 0d.H3 83us : set_normalized_timespec (ktime_get_ts)
- sshd-4261 0d.H3 84us : clockevents_program_event (tick_program_event)
- sshd-4261 0d.H3 84us : lapic_next_event (clockevents_program_event)
- sshd-4261 0d.H3 85us : irq_exit (smp_apic_timer_interrupt)
- sshd-4261 0d.H3 85us : sub_preempt_count (irq_exit)
- sshd-4261 0d.s4 86us : sub_preempt_count (irq_exit)
- sshd-4261 0d.s3 86us : add_preempt_count (__local_bh_disable)
-[...]
- sshd-4261 0d.s1 98us : sub_preempt_count (net_rx_action)
- sshd-4261 0d.s. 99us : add_preempt_count (_spin_lock_irq)
- sshd-4261 0d.s1 99us+: _spin_unlock_irq (run_timer_softirq)
- sshd-4261 0d.s. 104us : _local_bh_enable (__do_softirq)
- sshd-4261 0d.s. 104us : sub_preempt_count (_local_bh_enable)
- sshd-4261 0d.s. 105us : _local_bh_enable (__do_softirq)
- sshd-4261 0d.s1 105us : trace_preempt_on (__do_softirq)
-
-
-This is a very interesting trace. It started with the preemption of
-the ls task. We see that the task had the "need_resched" bit set
-with the 'N' in the trace. Interrupts are disabled in the spin_lock
-and the trace started. We see that a schedule took place to run
-sshd. When the interrupts were enabled we took an interrupt.
-On return of the interrupt the softirq ran. We took another interrupt
-while running the softirq as we see with the capital 'H'.
-
-
-wakeup
-------
-
-In Real-Time environment it is very important to know the wakeup
-time it takes for the highest priority task that wakes up to the
-time it executes. This is also known as "schedule latency".
-I stress the point that this is about RT tasks. It is also important
-to know the scheduling latency of non-RT tasks, but the average
-schedule latency is better for non-RT tasks. Tools like
-LatencyTop is more appropriate for such measurements.
-
-Real-Time environments is interested in the worst case latency.
-That is the longest latency it takes for something to happen, and
-not the average. We can have a very fast scheduler that may only
-have a large latency once in a while, but that would not work well
-with Real-Time tasks. The wakeup tracer was designed to record
-the worst case wakeups of RT tasks. Non-RT tasks are not recorded
-because the tracer only records one worst case and tracing non-RT
-tasks that are unpredictable will overwrite the worst case latency
-of RT tasks.
-
-Since this tracer only deals with RT tasks, we will run this slightly
-different than we did with the previous tracers. Instead of performing
-an 'ls' we will run 'sleep 1' under 'chrt' which changes the
-priority of the task.
-
- # echo wakeup > /debug/tracing/current_tracer
- # echo 0 > /debug/tracing/tracing_max_latency
- # echo 1 > /debug/tracing/tracing_enabled
- # chrt -f 5 sleep 1
- # echo 0 > /debug/tracing/tracing_enabled
- # cat /debug/tracing/latency_trace
-# tracer: wakeup
-#
-wakeup latency trace v1.1.5 on 2.6.26-rc8
---------------------------------------------------------------------
- latency: 4 us, #2/2, CPU#1 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:2)
- -----------------
- | task: sleep-4901 (uid:0 nice:0 policy:1 rt_prio:5)
- -----------------
-
-# _------=> CPU#
-# / _-----=> irqs-off
-# | / _----=> need-resched
-# || / _---=> hardirq/softirq
-# ||| / _--=> preempt-depth
-# |||| /
-# ||||| delay
-# cmd pid ||||| time | caller
-# \ / ||||| \ | /
- <idle>-0 1d.h4 0us+: try_to_wake_up (wake_up_process)
- <idle>-0 1d..4 4us : schedule (cpu_idle)
-
-
-vim:ft=help
-
-
-Running this on an idle system we see that it only took 4 microseconds
-to perform the task switch. Note, since the trace marker in the
-schedule is before the actual "switch" we stop the tracing when
-the recorded task is about to schedule in. This may change if
-we add a new marker at the end of the scheduler.
-
-Notice that the recorded task is 'sleep' with the PID of 4901 and it
-has an rt_prio of 5. This priority is user-space priority and not
-the internal kernel priority. The policy is 1 for SCHED_FIFO and 2
-for SCHED_RR.
-
-Doing the same with chrt -r 5 and ftrace_enabled set.
-
-# tracer: wakeup
-#
-wakeup latency trace v1.1.5 on 2.6.26-rc8
---------------------------------------------------------------------
- latency: 50 us, #60/60, CPU#1 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:2)
- -----------------
- | task: sleep-4068 (uid:0 nice:0 policy:2 rt_prio:5)
- -----------------
-
-# _------=> CPU#
-# / _-----=> irqs-off
-# | / _----=> need-resched
-# || / _---=> hardirq/softirq
-# ||| / _--=> preempt-depth
-# |||| /
-# ||||| delay
-# cmd pid ||||| time | caller
-# \ / ||||| \ | /
-ksoftirq-7 1d.H3 0us : try_to_wake_up (wake_up_process)
-ksoftirq-7 1d.H4 1us : sub_preempt_count (marker_probe_cb)
-ksoftirq-7 1d.H3 2us : check_preempt_wakeup (try_to_wake_up)
-ksoftirq-7 1d.H3 3us : update_curr (check_preempt_wakeup)
-ksoftirq-7 1d.H3 4us : calc_delta_mine (update_curr)
-ksoftirq-7 1d.H3 5us : __resched_task (check_preempt_wakeup)
-ksoftirq-7 1d.H3 6us : task_wake_up_rt (try_to_wake_up)
-ksoftirq-7 1d.H3 7us : _spin_unlock_irqrestore (try_to_wake_up)
-[...]
-ksoftirq-7 1d.H2 17us : irq_exit (smp_apic_timer_interrupt)
-ksoftirq-7 1d.H2 18us : sub_preempt_count (irq_exit)
-ksoftirq-7 1d.s3 19us : sub_preempt_count (irq_exit)
-ksoftirq-7 1..s2 20us : rcu_process_callbacks (__do_softirq)
-[...]
-ksoftirq-7 1..s2 26us : __rcu_process_callbacks (rcu_process_callbacks)
-ksoftirq-7 1d.s2 27us : _local_bh_enable (__do_softirq)
-ksoftirq-7 1d.s2 28us : sub_preempt_count (_local_bh_enable)
-ksoftirq-7 1.N.3 29us : sub_preempt_count (ksoftirqd)
-ksoftirq-7 1.N.2 30us : _cond_resched (ksoftirqd)
-ksoftirq-7 1.N.2 31us : __cond_resched (_cond_resched)
-ksoftirq-7 1.N.2 32us : add_preempt_count (__cond_resched)
-ksoftirq-7 1.N.2 33us : schedule (__cond_resched)
-ksoftirq-7 1.N.2 33us : add_preempt_count (schedule)
-ksoftirq-7 1.N.3 34us : hrtick_clear (schedule)
-ksoftirq-7 1dN.3 35us : _spin_lock (schedule)
-ksoftirq-7 1dN.3 36us : add_preempt_count (_spin_lock)
-ksoftirq-7 1d..4 37us : put_prev_task_fair (schedule)
-ksoftirq-7 1d..4 38us : update_curr (put_prev_task_fair)
-[...]
-ksoftirq-7 1d..5 47us : _spin_trylock (tracing_record_cmdline)
-ksoftirq-7 1d..5 48us : add_preempt_count (_spin_trylock)
-ksoftirq-7 1d..6 49us : _spin_unlock (tracing_record_cmdline)
-ksoftirq-7 1d..6 49us : sub_preempt_count (_spin_unlock)
-ksoftirq-7 1d..4 50us : schedule (__cond_resched)
-
-The interrupt went off while running ksoftirqd. This task runs at
-SCHED_OTHER. Why didn't we see the 'N' set early? This may be
-a harmless bug with x86_32 and 4K stacks. The need_reched() function
-that tests if we need to reschedule looks on the actual stack.
-Where as the setting of the NEED_RESCHED bit happens on the
-task's stack. But because we are in a hard interrupt, the test
-is with the interrupts stack which has that to be false. We don't
-see the 'N' until we switch back to the task's stack.
-
-ftrace
-------
-
-ftrace is not only the name of the tracing infrastructure, but it
-is also a name of one of the tracers. The tracer is the function
-tracer. Enabling the function tracer can be done from the
-debug file system. Make sure the ftrace_enabled is set otherwise
-this tracer is a nop.
-
- # sysctl kernel.ftrace_enabled=1
- # echo ftrace > /debug/tracing/current_tracer
- # echo 1 > /debug/tracing/tracing_enabled
- # usleep 1
- # echo 0 > /debug/tracing/tracing_enabled
- # cat /debug/tracing/trace
-# tracer: ftrace
-#
-# TASK-PID CPU# TIMESTAMP FUNCTION
-# | | | | |
- bash-4003 [00] 123.638713: finish_task_switch <-schedule
- bash-4003 [00] 123.638714: _spin_unlock_irq <-finish_task_switch
- bash-4003 [00] 123.638714: sub_preempt_count <-_spin_unlock_irq
- bash-4003 [00] 123.638715: hrtick_set <-schedule
- bash-4003 [00] 123.638715: _spin_lock_irqsave <-hrtick_set
- bash-4003 [00] 123.638716: add_preempt_count <-_spin_lock_irqsave
- bash-4003 [00] 123.638716: _spin_unlock_irqrestore <-hrtick_set
- bash-4003 [00] 123.638717: sub_preempt_count <-_spin_unlock_irqrestore
- bash-4003 [00] 123.638717: hrtick_clear <-hrtick_set
- bash-4003 [00] 123.638718: sub_preempt_count <-schedule
- bash-4003 [00] 123.638718: sub_preempt_count <-preempt_schedule
- bash-4003 [00] 123.638719: wait_for_completion <-__stop_machine_run
- bash-4003 [00] 123.638719: wait_for_common <-wait_for_completion
- bash-4003 [00] 123.638720: _spin_lock_irq <-wait_for_common
- bash-4003 [00] 123.638720: add_preempt_count <-_spin_lock_irq
-[...]
-
-
-Note: It is sometimes better to enable or disable tracing directly from
-a program, because the buffer may be overflowed by the echo commands
-before you get to the point you want to trace. It is also easier to
-stop the tracing at the point that you hit the part that you are
-interested in. Since the ftrace buffer is a ring buffer with the
-oldest data being overwritten, usually it is sufficient to start the
-tracer with an echo command but have you code stop it. Something
-like the following is usually appropriate for this.
-
-int trace_fd;
-[...]
-int main(int argc, char *argv[]) {
- [...]
- trace_fd = open("/debug/tracing/tracing_enabled", O_WRONLY);
- [...]
- if (condition_hit()) {
- write(trace_fd, "0", 1);
- }
- [...]
-}
-
-
-dynamic ftrace
---------------
-
-If CONFIG_DYNAMIC_FTRACE is set, then the system will run with
-virtually no overhead when function tracing is disabled. The way
-this works is the mcount function call (placed at the start of
-every kernel function, produced by the -pg switch in gcc), starts
-of pointing to a simple return.
-
-When dynamic ftrace is initialized, it calls kstop_machine to make it
-act like a uniprocessor so that it can freely modify code without
-worrying about other processors executing that same code. At
-initialization, the mcount calls are change to call a "record_ip"
-function. After this, the first time a kernel function is called,
-it has the calling address saved in a hash table.
-
-Later on the ftraced kernel thread is awoken and will again call
-kstop_machine if new functions have been recorded. The ftraced thread
-will change all calls to mcount to "nop". Just calling mcount
-and having mcount return has shown a 10% overhead. By converting
-it to a nop, there is no recordable overhead to the system.
-
-One special side-effect to the recording of the functions being
-traced, is that we can now selectively choose which functions we
-want to trace and which ones we want the mcount calls to remain as
-nops.
-
-Two files that contain to the enabling and disabling of recorded
-functions are:
-
- set_ftrace_filter
-
-and
-
- set_ftrace_notrace
-
-A list of available functions that you can add to this files is listed
-in:
-
- available_filter_functions
-
- # cat /debug/tracing/available_filter_functions
-put_prev_task_idle
-kmem_cache_create
-pick_next_task_rt
-get_online_cpus
-pick_next_task_fair
-mutex_lock
-[...]
-
-If I'm only interested in sys_nanosleep and hrtimer_interrupt:
-
- # echo sys_nanosleep hrtimer_interrupt \
- > /debug/tracing/set_ftrace_filter
- # echo ftrace > /debug/tracing/current_tracer
- # echo 1 > /debug/tracing/tracing_enabled
- # usleep 1
- # echo 0 > /debug/tracing/tracing_enabled
- # cat /debug/tracing/trace
-# tracer: ftrace
-#
-# TASK-PID CPU# TIMESTAMP FUNCTION
-# | | | | |
- usleep-4134 [00] 1317.070017: hrtimer_interrupt <-smp_apic_timer_interrupt
- usleep-4134 [00] 1317.070111: sys_nanosleep <-syscall_call
- <idle>-0 [00] 1317.070115: hrtimer_interrupt <-smp_apic_timer_interrupt
-
-To see what functions are being traced, you can cat the file:
-
- # cat /debug/tracing/set_ftrace_filter
-hrtimer_interrupt
-sys_nanosleep
-
-
-Perhaps this isn't enough. The filters also allow simple wild cards.
-Only the following is currently available
-
- <match>* - will match functions that begins with <match>
- *<match> - will match functions that end with <match>
- *<match>* - will match functions that have <match> in it
-
-Thats all the wild cards that are allowed.
-
- <match>*<match> will not work.
-
- # echo hrtimer_* > /debug/tracing/set_ftrace_filter
-
-Produces:
-
-# tracer: ftrace
-#
-# TASK-PID CPU# TIMESTAMP FUNCTION
-# | | | | |
- bash-4003 [00] 1480.611794: hrtimer_init <-copy_process
- bash-4003 [00] 1480.611941: hrtimer_start <-hrtick_set
- bash-4003 [00] 1480.611956: hrtimer_cancel <-hrtick_clear
- bash-4003 [00] 1480.611956: hrtimer_try_to_cancel <-hrtimer_cancel
- <idle>-0 [00] 1480.612019: hrtimer_get_next_event <-get_next_timer_interrupt
- <idle>-0 [00] 1480.612025: hrtimer_get_next_event <-get_next_timer_interrupt
- <idle>-0 [00] 1480.612032: hrtimer_get_next_event <-get_next_timer_interrupt
- <idle>-0 [00] 1480.612037: hrtimer_get_next_event <-get_next_timer_interrupt
- <idle>-0 [00] 1480.612382: hrtimer_get_next_event <-get_next_timer_interrupt
-
-
-Notice that we lost the sys_nanosleep.
-
- # cat /debug/tracing/set_ftrace_filter
-hrtimer_run_queues
-hrtimer_run_pending
-hrtimer_init
-hrtimer_cancel
-hrtimer_try_to_cancel
-hrtimer_forward
-hrtimer_start
-hrtimer_reprogram
-hrtimer_force_reprogram
-hrtimer_get_next_event
-hrtimer_interrupt
-hrtimer_nanosleep
-hrtimer_wakeup
-hrtimer_get_remaining
-hrtimer_get_res
-hrtimer_init_sleeper
-
-
-This is because the '>' and '>>' act just like they do in bash.
-To rewrite the filters, use '>'
-To append to the filters, use '>>'
-
-To clear out a filter so that all functions will be recorded again.
-
- # echo > /debug/tracing/set_ftrace_filter
- # cat /debug/tracing/set_ftrace_filter
- #
-
-Again, now we want to append.
-
- # echo sys_nanosleep > /debug/tracing/set_ftrace_filter
- # cat /debug/tracing/set_ftrace_filter
-sys_nanosleep
- # echo hrtimer_* >> /debug/tracing/set_ftrace_filter
- # cat /debug/tracing/set_ftrace_filter
-hrtimer_run_queues
-hrtimer_run_pending
-hrtimer_init
-hrtimer_cancel
-hrtimer_try_to_cancel
-hrtimer_forward
-hrtimer_start
-hrtimer_reprogram
-hrtimer_force_reprogram
-hrtimer_get_next_event
-hrtimer_interrupt
-sys_nanosleep
-hrtimer_nanosleep
-hrtimer_wakeup
-hrtimer_get_remaining
-hrtimer_get_res
-hrtimer_init_sleeper
-
-
-The set_ftrace_notrace prevents those functions from being traced.
-
- # echo '*preempt*' '*lock*' > /debug/tracing/set_ftrace_notrace
-
-Produces:
-
-# tracer: ftrace
-#
-# TASK-PID CPU# TIMESTAMP FUNCTION
-# | | | | |
- bash-4043 [01] 115.281644: finish_task_switch <-schedule
- bash-4043 [01] 115.281645: hrtick_set <-schedule
- bash-4043 [01] 115.281645: hrtick_clear <-hrtick_set
- bash-4043 [01] 115.281646: wait_for_completion <-__stop_machine_run
- bash-4043 [01] 115.281647: wait_for_common <-wait_for_completion
- bash-4043 [01] 115.281647: kthread_stop <-stop_machine_run
- bash-4043 [01] 115.281648: init_waitqueue_head <-kthread_stop
- bash-4043 [01] 115.281648: wake_up_process <-kthread_stop
- bash-4043 [01] 115.281649: try_to_wake_up <-wake_up_process
-
-We can see that there's no more lock or preempt tracing.
-
-ftraced
--------
-
-As mentioned above, when dynamic ftrace is configured in, a kernel
-thread wakes up once a second and checks to see if there are mcount
-calls that need to be converted into nops. If there is not, then
-it simply goes back to sleep. But if there is, it will call
-kstop_machine to convert the calls to nops.
-
-There may be a case that you do not want this added latency.
-Perhaps you are doing some audio recording and this activity might
-cause skips in the playback. There is an interface to disable
-and enable the ftraced kernel thread.
-
- # echo 0 > /debug/tracing/ftraced_enabled
-
-This will disable the calling of the kstop_machine to update the
-mcount calls to nops. Remember that there's a large overhead
-to calling mcount. Without this kernel thread, that overhead will
-exist.
-
-Any write to the ftraced_enabled file will cause the kstop_machine
-to run if there are recorded calls to mcount. This means that a
-user can manually perform the updates when they want to by simply
-echoing a '0' into the ftraced_enabled file.
-
-The updates are also done at the beginning of enabling a tracer
-that uses ftrace function recording.
-
-
-trace_pipe
-----------
-
-The trace_pipe outputs the same as trace, but the effect on the
-tracing is different. Every read from trace_pipe is consumed.
-This means that subsequent reads will be different. The trace
-is live.
-
- # echo ftrace > /debug/tracing/current_tracer
- # cat /debug/tracing/trace_pipe > /tmp/trace.out &
-[1] 4153
- # echo 1 > /debug/tracing/tracing_enabled
- # usleep 1
- # echo 0 > /debug/tracing/tracing_enabled
- # cat /debug/tracing/trace
-# tracer: ftrace
-#
-# TASK-PID CPU# TIMESTAMP FUNCTION
-# | | | | |
-
- #
- # cat /tmp/trace.out
- bash-4043 [00] 41.267106: finish_task_switch <-schedule
- bash-4043 [00] 41.267106: hrtick_set <-schedule
- bash-4043 [00] 41.267107: hrtick_clear <-hrtick_set
- bash-4043 [00] 41.267108: wait_for_completion <-__stop_machine_run
- bash-4043 [00] 41.267108: wait_for_common <-wait_for_completion
- bash-4043 [00] 41.267109: kthread_stop <-stop_machine_run
- bash-4043 [00] 41.267109: init_waitqueue_head <-kthread_stop
- bash-4043 [00] 41.267110: wake_up_process <-kthread_stop
- bash-4043 [00] 41.267110: try_to_wake_up <-wake_up_process
- bash-4043 [00] 41.267111: select_task_rq_rt <-try_to_wake_up
-
-
-Note, reading the trace_pipe will block until more input is added.
-By changing the tracer, trace_pipe will issue an EOF. We needed
-to set the ftrace tracer _before_ cating the trace_pipe file.
-
-
-trace entries
--------------
-
-Having too much or not enough data can be troublesome in diagnosing
-some issue in the kernel. The file trace_entries is used to modify
-the size of the internal trace buffers. The numbers listed
-is the number of entries that can be recorded per CPU. To know
-the full size, multiply the number of possible CPUS with the
-number of entries.
-
- # cat /debug/tracing/trace_entries
-65620
-
-Note, to modify this you must have tracing fulling disabled. To do that,
-echo "none" into the current_tracer.
-
- # echo none > /debug/tracing/current_tracer
- # echo 100000 > /debug/tracing/trace_entries
- # cat /debug/tracing/trace_entries
-100045
-
-
-Notice that we echoed in 100,000 but the size is 100,045. The entries
-are held by individual pages. It allocates the number of pages it takes
-to fulfill the request. If more entries may fit on the last page
-it will add them.
-
- # echo 1 > /debug/tracing/trace_entries
- # cat /debug/tracing/trace_entries
-85
-
-This shows us that 85 entries can fit on a single page.
-
-The number of pages that will be allocated is a percentage of available
-memory. Allocating too much will produces an error.
-
- # echo 1000000000000 > /debug/tracing/trace_entries
--bash: echo: write error: Cannot allocate memory
- # cat /debug/tracing/trace_entries
-85
-
diff --git a/Makefile b/Makefile
index c536d7b..5599044 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
VERSION = 2
PATCHLEVEL = 6
SUBLEVEL = 26
-EXTRAVERSION = .1
+EXTRAVERSION = .2
NAME = Rotary Wombat
# *DOCUMENTATION*
diff --git a/arch/powerpc/kernel/ppc32.h b/arch/powerpc/kernel/ppc32.h
index 90e5627..fda05e2 100644
--- a/arch/powerpc/kernel/ppc32.h
+++ b/arch/powerpc/kernel/ppc32.h
@@ -135,4 +135,6 @@ struct ucontext32 {
struct mcontext32 uc_mcontext;
};
+extern int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s);
+
#endif /* _PPC64_PPC32_H */
diff --git a/arch/powerpc/kernel/ptrace32.c b/arch/powerpc/kernel/ptrace32.c
index 4c1de6a..9d30e10 100644
--- a/arch/powerpc/kernel/ptrace32.c
+++ b/arch/powerpc/kernel/ptrace32.c
@@ -29,12 +29,15 @@
#include <linux/security.h>
#include <linux/signal.h>
#include <linux/compat.h>
+#include <linux/elf.h>
#include <asm/uaccess.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/system.h>
+#include "ppc32.h"
+
/*
* does not yet catch signals sent when the child dies.
* in exit.c or in signal.c.
@@ -64,6 +67,27 @@ static long compat_ptrace_old(struct task_struct *child, long request,
return -EPERM;
}
+static int compat_ptrace_getsiginfo(struct task_struct *child, compat_siginfo_t __user *data)
+{
+ siginfo_t lastinfo;
+ int error = -ESRCH;
+
+ read_lock(&tasklist_lock);
+ if (likely(child->sighand != NULL)) {
+ error = -EINVAL;
+ spin_lock_irq(&child->sighand->siglock);
+ if (likely(child->last_siginfo != NULL)) {
+ lastinfo = *child->last_siginfo;
+ error = 0;
+ }
+ spin_unlock_irq(&child->sighand->siglock);
+ }
+ read_unlock(&tasklist_lock);
+ if (!error)
+ return copy_siginfo_to_user32(data, &lastinfo);
+ return error;
+}
+
long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
compat_ulong_t caddr, compat_ulong_t cdata)
{
@@ -282,6 +306,9 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
0, PT_REGS_COUNT * sizeof(compat_long_t),
compat_ptr(data));
+ case PTRACE_GETSIGINFO:
+ return compat_ptrace_getsiginfo(child, compat_ptr(data));
+
case PTRACE_GETFPREGS:
case PTRACE_SETFPREGS:
case PTRACE_GETVRREGS:
diff --git a/arch/x86/kernel/io_delay.c b/arch/x86/kernel/io_delay.c
index 5921e5f..1c3a66a 100644
--- a/arch/x86/kernel/io_delay.c
+++ b/arch/x86/kernel/io_delay.c
@@ -103,6 +103,9 @@ void __init io_delay_init(void)
static int __init io_delay_param(char *s)
{
+ if (!s)
+ return -EINVAL;
+
if (!strcmp(s, "0x80"))
io_delay_type = CONFIG_IO_DELAY_TYPE_0X80;
else if (!strcmp(s, "0xed"))
diff --git a/arch/x86/kernel/kprobes.c b/arch/x86/kernel/kprobes.c
index b8c6743..43c019f 100644
--- a/arch/x86/kernel/kprobes.c
+++ b/arch/x86/kernel/kprobes.c
@@ -860,7 +860,6 @@ static int __kprobes post_kprobe_handler(struct pt_regs *regs)
resume_execution(cur, regs, kcb);
regs->flags |= kcb->kprobe_saved_flags;
- trace_hardirqs_fixup_flags(regs->flags);
if ((kcb->kprobe_status != KPROBE_REENTER) && cur->post_handler) {
kcb->kprobe_status = KPROBE_HIT_SSDONE;
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index ba370dc..58325a6 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -164,6 +164,9 @@ void __cpuinit select_idle_routine(const struct cpuinfo_x86 *c)
static int __init idle_setup(char *str)
{
+ if (!str)
+ return -EINVAL;
+
if (!strcmp(str, "poll")) {
printk("using polling idle threads.\n");
pm_idle = poll_idle;
diff --git a/block/bsg.c b/block/bsg.c
index 54d617f..0526471 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -725,8 +725,13 @@ static int bsg_put_device(struct bsg_device *bd)
mutex_lock(&bsg_mutex);
do_free = atomic_dec_and_test(&bd->ref_count);
- if (!do_free)
+ if (!do_free) {
+ mutex_unlock(&bsg_mutex);
goto out;
+ }
+
+ hlist_del(&bd->dev_list);
+ mutex_unlock(&bsg_mutex);
dprintk("%s: tearing down\n", bd->name);
@@ -742,10 +747,8 @@ static int bsg_put_device(struct bsg_device *bd)
*/
ret = bsg_complete_all_commands(bd);
- hlist_del(&bd->dev_list);
kfree(bd);
out:
- mutex_unlock(&bsg_mutex);
kref_put(&q->bsg_dev.ref, bsg_kref_release_function);
if (do_free)
blk_put_queue(q);
diff --git a/drivers/input/serio/i8042-x86ia64io.h b/drivers/input/serio/i8042-x86ia64io.h
index 78eb784..7828ef2 100644
--- a/drivers/input/serio/i8042-x86ia64io.h
+++ b/drivers/input/serio/i8042-x86ia64io.h
@@ -63,7 +63,7 @@ static inline void i8042_write_command(int val)
outb(val, I8042_COMMAND_REG);
}
-#if defined(__i386__) || defined(__x86_64__)
+#ifdef CONFIG_X86
#include <linux/dmi.h>
@@ -291,17 +291,36 @@ static struct dmi_system_id __initdata i8042_dmi_nomux_table[] = {
DMI_MATCH(DMI_PRODUCT_VERSION, "3000 N100"),
},
},
+ {
+ .ident = "Acer Aspire 1360",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 1360"),
+ },
+ },
{ }
};
-
-
+#ifdef CONFIG_PNP
+static struct dmi_system_id __initdata i8042_dmi_nopnp_table[] = {
+ {
+ .ident = "Intel MBO Desktop D845PESV",
+ .matches = {
+ DMI_MATCH(DMI_BOARD_NAME, "D845PESV"),
+ DMI_MATCH(DMI_BOARD_VENDOR, "Intel Corporation"),
+ },
+ },
+ {
+ .ident = "Gericom Bellagio",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Gericom"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "N34AS6"),
+ },
+ },
+ { }
+};
#endif
-#ifdef CONFIG_X86
-
-#include <linux/dmi.h>
-
/*
* Some Wistron based laptops need us to explicitly enable the 'Dritek
* keyboard extension' to make their extra keys start generating scancodes.
@@ -356,7 +375,6 @@ static struct dmi_system_id __initdata i8042_dmi_dritek_table[] = {
#endif /* CONFIG_X86 */
-
#ifdef CONFIG_PNP
#include <linux/pnp.h>
@@ -466,6 +484,11 @@ static int __init i8042_pnp_init(void)
int pnp_data_busted = 0;
int err;
+#ifdef CONFIG_X86
+ if (dmi_check_system(i8042_dmi_nopnp_table))
+ i8042_nopnp = 1;
+#endif
+
if (i8042_nopnp) {
printk(KERN_INFO "i8042: PNP detection disabled\n");
return 0;
@@ -591,15 +614,13 @@ static int __init i8042_platform_init(void)
i8042_reset = 1;
#endif
-#if defined(__i386__) || defined(__x86_64__)
+#ifdef CONFIG_X86
if (dmi_check_system(i8042_dmi_noloop_table))
i8042_noloop = 1;
if (dmi_check_system(i8042_dmi_nomux_table))
i8042_nomux = 1;
-#endif
-#ifdef CONFIG_X86
if (dmi_check_system(i8042_dmi_dritek_table))
i8042_dritek = 1;
#endif /* CONFIG_X86 */
diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index 1074824..ec921f5 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -126,7 +126,7 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
int j = rdev->raid_disk;
dev_info_t *disk = conf->disks + j;
- if (j < 0 || j > raid_disks || disk->rdev) {
+ if (j < 0 || j >= raid_disks || disk->rdev) {
printk("linear: disk numbering problem. Aborting!\n");
goto out;
}
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 2580ac1..9664511 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3326,9 +3326,9 @@ static struct kobject *md_probe(dev_t dev, int *part, void *data)
disk->queue = mddev->queue;
add_disk(disk);
mddev->gendisk = disk;
- mutex_unlock(&disks_mutex);
error = kobject_init_and_add(&mddev->kobj, &md_ktype, &disk->dev.kobj,
"%s", "md");
+ mutex_unlock(&disks_mutex);
if (error)
printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
disk->disk_name);
diff --git a/drivers/net/wireless/ath5k/base.c b/drivers/net/wireless/ath5k/base.c
index e57905c..bc3ea09 100644
--- a/drivers/net/wireless/ath5k/base.c
+++ b/drivers/net/wireless/ath5k/base.c
@@ -1774,20 +1774,21 @@ ath5k_tasklet_rx(unsigned long data)
struct ath5k_rx_status rs = {};
struct sk_buff *skb;
struct ath5k_softc *sc = (void *)data;
- struct ath5k_buf *bf;
+ struct ath5k_buf *bf, *bf_last;
struct ath5k_desc *ds;
int ret;
int hdrlen;
int pad;
spin_lock(&sc->rxbuflock);
+ if (list_empty(&sc->rxbuf)) {
+ ATH5K_WARN(sc, "empty rx buf pool\n");
+ goto unlock;
+ }
+ bf_last = list_entry(sc->rxbuf.prev, struct ath5k_buf, list);
do {
rxs.flag = 0;
- if (unlikely(list_empty(&sc->rxbuf))) {
- ATH5K_WARN(sc, "empty rx buf pool\n");
- break;
- }
bf = list_first_entry(&sc->rxbuf, struct ath5k_buf, list);
BUG_ON(bf->skb == NULL);
skb = bf->skb;
@@ -1797,8 +1798,24 @@ ath5k_tasklet_rx(unsigned long data)
pci_dma_sync_single_for_cpu(sc->pdev, sc->desc_daddr,
sc->desc_len, PCI_DMA_FROMDEVICE);
- if (unlikely(ds->ds_link == bf->daddr)) /* this is the end */
- break;
+ /*
+ * last buffer must not be freed to ensure proper hardware
+ * function. When the hardware finishes also a packet next to
+ * it, we are sure, it doesn't use it anymore and we can go on.
+ */
+ if (bf_last == bf)
+ bf->flags |= 1;
+ if (bf->flags) {
+ struct ath5k_buf *bf_next = list_entry(bf->list.next,
+ struct ath5k_buf, list);
+ ret = sc->ah->ah_proc_rx_desc(sc->ah, bf_next->desc,
+ &rs);
+ if (ret)
+ break;
+ bf->flags &= ~1;
+ /* skip the overwritten one (even status is martian) */
+ goto next;
+ }
ret = sc->ah->ah_proc_rx_desc(sc->ah, ds, &rs);
if (unlikely(ret == -EINPROGRESS))
@@ -1921,6 +1938,7 @@ accept:
next:
list_move_tail(&bf->list, &sc->rxbuf);
} while (ath5k_rxbuf_setup(sc, bf) == 0);
+unlock:
spin_unlock(&sc->rxbuflock);
}
@@ -2435,6 +2453,9 @@ ath5k_stop_hw(struct ath5k_softc *sc)
mutex_unlock(&sc->lock);
del_timer_sync(&sc->calib_tim);
+ tasklet_kill(&sc->rxtq);
+ tasklet_kill(&sc->txtq);
+ tasklet_kill(&sc->restq);
return ret;
}
diff --git a/drivers/net/wireless/ath5k/base.h b/drivers/net/wireless/ath5k/base.h
index 3a97558..4badca7 100644
--- a/drivers/net/wireless/ath5k/base.h
+++ b/drivers/net/wireless/ath5k/base.h
@@ -55,7 +55,7 @@
struct ath5k_buf {
struct list_head list;
- unsigned int flags; /* tx descriptor flags */
+ unsigned int flags; /* rx descriptor flags */
struct ath5k_desc *desc; /* virtual addr of desc */
dma_addr_t daddr; /* physical addr of desc */
struct sk_buff *skb; /* skbuff for buf */
diff --git a/drivers/scsi/ch.c b/drivers/scsi/ch.c
index c4b938b..2be2da6 100644
--- a/drivers/scsi/ch.c
+++ b/drivers/scsi/ch.c
@@ -926,6 +926,7 @@ static int ch_probe(struct device *dev)
if (init)
ch_init_elem(ch);
+ dev_set_drvdata(dev, ch);
sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
return 0;
diff --git a/fs/jbd/transaction.c b/fs/jbd/transaction.c
index 67ff202..8dee320 100644
--- a/fs/jbd/transaction.c
+++ b/fs/jbd/transaction.c
@@ -1648,12 +1648,42 @@ out:
return;
}
+/*
+ * journal_try_to_free_buffers() could race with journal_commit_transaction()
+ * The latter might still hold the a count on buffers when inspecting
+ * them on t_syncdata_list or t_locked_list.
+ *
+ * journal_try_to_free_buffers() will call this function to
+ * wait for the current transaction to finish syncing data buffers, before
+ * tryinf to free that buffer.
+ *
+ * Called with journal->j_state_lock held.
+ */
+static void journal_wait_for_transaction_sync_data(journal_t *journal)
+{
+ transaction_t *transaction = NULL;
+ tid_t tid;
+
+ spin_lock(&journal->j_state_lock);
+ transaction = journal->j_committing_transaction;
+
+ if (!transaction) {
+ spin_unlock(&journal->j_state_lock);
+ return;
+ }
+
+ tid = transaction->t_tid;
+ spin_unlock(&journal->j_state_lock);
+ log_wait_commit(journal, tid);
+}
/**
* int journal_try_to_free_buffers() - try to free page buffers.
* @journal: journal for operation
* @page: to try and free
- * @unused_gfp_mask: unused
+ * @gfp_mask: we use the mask to detect how hard should we try to release
+ * buffers. If __GFP_WAIT and __GFP_FS is set, we wait for commit code to
+ * release the buffers.
*
*
* For all the buffers on this page,
@@ -1682,9 +1712,11 @@ out:
* journal_try_to_free_buffer() is changing its state. But that
* cannot happen because we never reallocate freed data as metadata
* while the data is part of a transaction. Yes?
+ *
+ * Return 0 on failure, 1 on success
*/
int journal_try_to_free_buffers(journal_t *journal,
- struct page *page, gfp_t unused_gfp_mask)
+ struct page *page, gfp_t gfp_mask)
{
struct buffer_head *head;
struct buffer_head *bh;
@@ -1713,7 +1745,28 @@ int journal_try_to_free_buffers(journal_t *journal,
if (buffer_jbd(bh))
goto busy;
} while ((bh = bh->b_this_page) != head);
+
ret = try_to_free_buffers(page);
+
+ /*
+ * There are a number of places where journal_try_to_free_buffers()
+ * could race with journal_commit_transaction(), the later still
+ * holds the reference to the buffers to free while processing them.
+ * try_to_free_buffers() failed to free those buffers. Some of the
+ * caller of releasepage() request page buffers to be dropped, otherwise
+ * treat the fail-to-free as errors (such as generic_file_direct_IO())
+ *
+ * So, if the caller of try_to_release_page() wants the synchronous
+ * behaviour(i.e make sure buffers are dropped upon return),
+ * let's wait for the current transaction to finish flush of
+ * dirty data buffers, then try to free those buffers again,
+ * with the journal locked.
+ */
+ if (ret == 0 && (gfp_mask & __GFP_WAIT) && (gfp_mask & __GFP_FS)) {
+ journal_wait_for_transaction_sync_data(journal);
+ ret = try_to_free_buffers(page);
+ }
+
busy:
return ret;
}
diff --git a/fs/namei.c b/fs/namei.c
index 01e67dd..3b26a24 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -519,7 +519,14 @@ static struct dentry * real_lookup(struct dentry * parent, struct qstr * name, s
*/
result = d_lookup(parent, name);
if (!result) {
- struct dentry * dentry = d_alloc(parent, name);
+ struct dentry *dentry;
+
+ /* Don't create child dentry for a dead directory. */
+ result = ERR_PTR(-ENOENT);
+ if (IS_DEADDIR(dir))
+ goto out_unlock;
+
+ dentry = d_alloc(parent, name);
result = ERR_PTR(-ENOMEM);
if (dentry) {
result = dir->i_op->lookup(dir, dentry, nd);
@@ -528,6 +535,7 @@ static struct dentry * real_lookup(struct dentry * parent, struct qstr * name, s
else
result = dentry;
}
+out_unlock:
mutex_unlock(&dir->i_mutex);
return result;
}
@@ -1317,7 +1325,14 @@ static struct dentry *__lookup_hash(struct qstr *name,
dentry = cached_lookup(base, name, nd);
if (!dentry) {
- struct dentry *new = d_alloc(base, name);
+ struct dentry *new;
+
+ /* Don't create child dentry for a dead directory. */
+ dentry = ERR_PTR(-ENOENT);
+ if (IS_DEADDIR(inode))
+ goto out;
+
+ new = d_alloc(base, name);
dentry = ERR_PTR(-ENOMEM);
if (!new)
goto out;
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 596c5d8..1d7ac64 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -57,8 +57,6 @@ static int enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
static void nfs_invalidate_inode(struct inode *);
static int nfs_update_inode(struct inode *, struct nfs_fattr *);
-static void nfs_zap_acl_cache(struct inode *);
-
static struct kmem_cache * nfs_inode_cachep;
static inline unsigned long
@@ -167,7 +165,7 @@ void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
}
}
-static void nfs_zap_acl_cache(struct inode *inode)
+void nfs_zap_acl_cache(struct inode *inode)
{
void (*clear_acl_cache)(struct inode *);
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 04ae867..24241fc 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -150,6 +150,7 @@ extern void nfs_clear_inode(struct inode *);
#ifdef CONFIG_NFS_V4
extern void nfs4_clear_inode(struct inode *);
#endif
+void nfs_zap_acl_cache(struct inode *inode);
/* super.c */
extern struct file_system_type nfs_xdev_fs_type;
diff --git a/fs/nfs/nfs3acl.c b/fs/nfs/nfs3acl.c
index 9b73625..423842f 100644
--- a/fs/nfs/nfs3acl.c
+++ b/fs/nfs/nfs3acl.c
@@ -5,6 +5,8 @@
#include <linux/posix_acl_xattr.h>
#include <linux/nfsacl.h>
+#include "internal.h"
+
#define NFSDBG_FACILITY NFSDBG_PROC
ssize_t nfs3_listxattr(struct dentry *dentry, char *buffer, size_t size)
@@ -205,6 +207,8 @@ struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type)
status = nfs_revalidate_inode(server, inode);
if (status < 0)
return ERR_PTR(status);
+ if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
+ nfs_zap_acl_cache(inode);
acl = nfs3_get_cached_acl(inode, type);
if (acl != ERR_PTR(-EAGAIN))
return acl;
@@ -319,9 +323,8 @@ static int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
dprintk("NFS call setacl\n");
msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
status = rpc_call_sync(server->client_acl, &msg, 0);
- spin_lock(&inode->i_lock);
- NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS;
- spin_unlock(&inode->i_lock);
+ nfs_access_zap_cache(inode);
+ nfs_zap_acl_cache(inode);
dprintk("NFS reply setacl: %d\n", status);
/* pages may have been allocated at the xdr layer. */
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 1293e0a..806d17f 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2706,6 +2706,8 @@ static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
ret = nfs_revalidate_inode(server, inode);
if (ret < 0)
return ret;
+ if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
+ nfs_zap_acl_cache(inode);
ret = nfs4_read_cached_acl(inode, buf, buflen);
if (ret != -ENOENT)
return ret;
@@ -2733,7 +2735,8 @@ static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t bufl
nfs_inode_return_delegation(inode);
buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
- nfs_zap_caches(inode);
+ nfs_access_zap_cache(inode);
+ nfs_zap_acl_cache(inode);
return ret;
}
diff --git a/fs/romfs/inode.c b/fs/romfs/inode.c
index 3f13d49..35e5c6e 100644
--- a/fs/romfs/inode.c
+++ b/fs/romfs/inode.c
@@ -418,7 +418,8 @@ static int
romfs_readpage(struct file *file, struct page * page)
{
struct inode *inode = page->mapping->host;
- loff_t offset, avail, readlen;
+ loff_t offset, size;
+ unsigned long filled;
void *buf;
int result = -EIO;
@@ -430,21 +431,29 @@ romfs_readpage(struct file *file, struct page * page)
/* 32 bit warning -- but not for us :) */
offset = page_offset(page);
- if (offset < i_size_read(inode)) {
- avail = inode->i_size-offset;
- readlen = min_t(unsigned long, avail, PAGE_SIZE);
- if (romfs_copyfrom(inode, buf, ROMFS_I(inode)->i_dataoffset+offset, readlen) == readlen) {
- if (readlen < PAGE_SIZE) {
- memset(buf + readlen,0,PAGE_SIZE-readlen);
- }
- SetPageUptodate(page);
- result = 0;
+ size = i_size_read(inode);
+ filled = 0;
+ result = 0;
+ if (offset < size) {
+ unsigned long readlen;
+
+ size -= offset;
+ readlen = size > PAGE_SIZE ? PAGE_SIZE : size;
+
+ filled = romfs_copyfrom(inode, buf, ROMFS_I(inode)->i_dataoffset+offset, readlen);
+
+ if (filled != readlen) {
+ SetPageError(page);
+ filled = 0;
+ result = -EIO;
}
}
- if (result) {
- memset(buf, 0, PAGE_SIZE);
- SetPageError(page);
- }
+
+ if (filled < PAGE_SIZE)
+ memset(buf + filled, 0, PAGE_SIZE-filled);
+
+ if (!result)
+ SetPageUptodate(page);
flush_dcache_page(page);
unlock_page(page);
diff --git a/include/sound/emu10k1.h b/include/sound/emu10k1.h
index 7b7b9b1..10ee28e 100644
--- a/include/sound/emu10k1.h
+++ b/include/sound/emu10k1.h
@@ -1670,6 +1670,7 @@ struct snd_emu_chip_details {
unsigned char spi_dac; /* SPI interface for DAC */
unsigned char i2c_adc; /* I2C interface for ADC */
unsigned char adc_1361t; /* Use Philips 1361T ADC */
+ unsigned char invert_shared_spdif; /* analog/digital switch inverted */
const char *driver;
const char *name;
const char *id; /* for backward compatibility - can be NULL if not needed */
diff --git a/mm/filemap.c b/mm/filemap.c
index 4f32423..afb991a 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2581,9 +2581,8 @@ out:
* Otherwise return zero.
*
* The @gfp_mask argument specifies whether I/O may be performed to release
- * this page (__GFP_IO), and whether the call may block (__GFP_WAIT).
+ * this page (__GFP_IO), and whether the call may block (__GFP_WAIT & __GFP_FS).
*
- * NOTE: @gfp_mask may go away, and this function may become non-blocking.
*/
int try_to_release_page(struct page *page, gfp_t gfp_mask)
{
diff --git a/net/bluetooth/bnep/core.c b/net/bluetooth/bnep/core.c
index f85d946..24e91eb 100644
--- a/net/bluetooth/bnep/core.c
+++ b/net/bluetooth/bnep/core.c
@@ -507,6 +507,11 @@ static int bnep_session(void *arg)
/* Delete network device */
unregister_netdev(dev);
+ /* Wakeup user-space polling for socket errors */
+ s->sock->sk->sk_err = EUNATCH;
+
+ wake_up_interruptible(s->sock->sk->sk_sleep);
+
/* Release the socket */
fput(s->sock->file);
diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index 519cdb9..96434d7 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -581,6 +581,12 @@ static int hidp_session(void *arg)
hid_free_device(session->hid);
}
+ /* Wakeup user-space polling for socket errors */
+ session->intr_sock->sk->sk_err = EUNATCH;
+ session->ctrl_sock->sk->sk_err = EUNATCH;
+
+ hidp_schedule(session);
+
fput(session->intr_sock->file);
wait_event_timeout(*(ctrl_sk->sk_sleep),
@@ -879,6 +885,10 @@ int hidp_del_connection(struct hidp_conndel_req *req)
skb_queue_purge(&session->ctrl_transmit);
skb_queue_purge(&session->intr_transmit);
+ /* Wakeup user-space polling for socket errors */
+ session->intr_sock->sk->sk_err = EUNATCH;
+ session->ctrl_sock->sk->sk_err = EUNATCH;
+
/* Kill session thread */
atomic_inc(&session->terminate);
hidp_schedule(session);
diff --git a/net/ipv4/netfilter/nf_nat_sip.c b/net/ipv4/netfilter/nf_nat_sip.c
index 4334d5c..1454432 100644
--- a/net/ipv4/netfilter/nf_nat_sip.c
+++ b/net/ipv4/netfilter/nf_nat_sip.c
@@ -318,11 +318,11 @@ static int mangle_content_len(struct sk_buff *skb,
buffer, buflen);
}
-static unsigned mangle_sdp_packet(struct sk_buff *skb, const char **dptr,
- unsigned int dataoff, unsigned int *datalen,
- enum sdp_header_types type,
- enum sdp_header_types term,
- char *buffer, int buflen)
+static int mangle_sdp_packet(struct sk_buff *skb, const char **dptr,
+ unsigned int dataoff, unsigned int *datalen,
+ enum sdp_header_types type,
+ enum sdp_header_types term,
+ char *buffer, int buflen)
{
enum ip_conntrack_info ctinfo;
struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
@@ -330,9 +330,9 @@ static unsigned mangle_sdp_packet(struct sk_buff *skb, const char **dptr,
if (ct_sip_get_sdp_header(ct, *dptr, dataoff, *datalen, type, term,
&matchoff, &matchlen) <= 0)
- return 0;
+ return -ENOENT;
return mangle_packet(skb, dptr, datalen, matchoff, matchlen,
- buffer, buflen);
+ buffer, buflen) ? 0 : -EINVAL;
}
static unsigned int ip_nat_sdp_addr(struct sk_buff *skb, const char **dptr,
@@ -346,8 +346,8 @@ static unsigned int ip_nat_sdp_addr(struct sk_buff *skb, const char **dptr,
unsigned int buflen;
buflen = sprintf(buffer, NIPQUAD_FMT, NIPQUAD(addr->ip));
- if (!mangle_sdp_packet(skb, dptr, dataoff, datalen, type, term,
- buffer, buflen))
+ if (mangle_sdp_packet(skb, dptr, dataoff, datalen, type, term,
+ buffer, buflen))
return 0;
return mangle_content_len(skb, dptr, datalen);
@@ -381,15 +381,27 @@ static unsigned int ip_nat_sdp_session(struct sk_buff *skb, const char **dptr,
/* Mangle session description owner and contact addresses */
buflen = sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(addr->ip));
- if (!mangle_sdp_packet(skb, dptr, dataoff, datalen,
+ if (mangle_sdp_packet(skb, dptr, dataoff, datalen,
SDP_HDR_OWNER_IP4, SDP_HDR_MEDIA,
buffer, buflen))
return 0;
- if (!mangle_sdp_packet(skb, dptr, dataoff, datalen,
- SDP_HDR_CONNECTION_IP4, SDP_HDR_MEDIA,
- buffer, buflen))
+ switch (mangle_sdp_packet(skb, dptr, dataoff, datalen,
+ SDP_HDR_CONNECTION_IP4, SDP_HDR_MEDIA,
+ buffer, buflen)) {
+ case 0:
+ /*
+ * RFC 2327:
+ *
+ * Session description
+ *
+ * c=* (connection information - not required if included in all media)
+ */
+ case -ENOENT:
+ break;
+ default:
return 0;
+ }
return mangle_content_len(skb, dptr, datalen);
}
diff --git a/net/netfilter/xt_time.c b/net/netfilter/xt_time.c
index ed76baa..9f32859 100644
--- a/net/netfilter/xt_time.c
+++ b/net/netfilter/xt_time.c
@@ -173,7 +173,7 @@ time_mt(const struct sk_buff *skb, const struct net_device *in,
__net_timestamp((struct sk_buff *)skb);
stamp = ktime_to_ns(skb->tstamp);
- do_div(stamp, NSEC_PER_SEC);
+ stamp = div_s64(stamp, NSEC_PER_SEC);
if (info->flags & XT_TIME_LOCAL_TZ)
/* Adjust for local timezone */
diff --git a/sound/core/seq/oss/seq_oss_synth.c b/sound/core/seq/oss/seq_oss_synth.c
index 558dadb..e024e45 100644
--- a/sound/core/seq/oss/seq_oss_synth.c
+++ b/sound/core/seq/oss/seq_oss_synth.c
@@ -604,6 +604,9 @@ snd_seq_oss_synth_make_info(struct seq_oss_devinfo *dp, int dev, struct synth_in
{
struct seq_oss_synth *rec;
+ if (dev < 0 || dev >= dp->max_synthdev)
+ return -ENXIO;
+
if (dp->synths[dev].is_midi) {
struct midi_info minf;
snd_seq_oss_midi_make_info(dp, dp->synths[dev].midi_mapped, &minf);
diff --git a/sound/pci/emu10k1/emu10k1_main.c b/sound/pci/emu10k1/emu10k1_main.c
index 548c9cc..2f283ea 100644
--- a/sound/pci/emu10k1/emu10k1_main.c
+++ b/sound/pci/emu10k1/emu10k1_main.c
@@ -1528,6 +1528,7 @@ static struct snd_emu_chip_details emu_chip_details[] = {
.ca0151_chip = 1,
.spk71 = 1,
.spdif_bug = 1,
+ .invert_shared_spdif = 1, /* digital/analog switch swapped */
.adc_1361t = 1, /* 24 bit capture instead of 16bit. Fixes ALSA bug#324 */
.ac97_chip = 1} ,
{.vendor = 0x1102, .device = 0x0004, .revision = 0x04,
diff --git a/sound/pci/emu10k1/emumixer.c b/sound/pci/emu10k1/emumixer.c
index fd22120..9f77692 100644
--- a/sound/pci/emu10k1/emumixer.c
+++ b/sound/pci/emu10k1/emumixer.c
@@ -1578,6 +1578,10 @@ static int snd_emu10k1_shared_spdif_get(struct snd_kcontrol *kcontrol,
ucontrol->value.integer.value[0] = inl(emu->port + A_IOCFG) & A_IOCFG_GPOUT0 ? 1 : 0;
else
ucontrol->value.integer.value[0] = inl(emu->port + HCFG) & HCFG_GPOUT0 ? 1 : 0;
+ if (emu->card_capabilities->invert_shared_spdif)
+ ucontrol->value.integer.value[0] =
+ !ucontrol->value.integer.value[0];
+
return 0;
}
@@ -1586,15 +1590,18 @@ static int snd_emu10k1_shared_spdif_put(struct snd_kcontrol *kcontrol,
{
unsigned long flags;
struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
- unsigned int reg, val;
+ unsigned int reg, val, sw;
int change = 0;
+ sw = ucontrol->value.integer.value[0];
+ if (emu->card_capabilities->invert_shared_spdif)
+ sw = !sw;
spin_lock_irqsave(&emu->reg_lock, flags);
if ( emu->card_capabilities->i2c_adc) {
/* Do nothing for Audigy 2 ZS Notebook */
} else if (emu->audigy) {
reg = inl(emu->port + A_IOCFG);
- val = ucontrol->value.integer.value[0] ? A_IOCFG_GPOUT0 : 0;
+ val = sw ? A_IOCFG_GPOUT0 : 0;
change = (reg & A_IOCFG_GPOUT0) != val;
if (change) {
reg &= ~A_IOCFG_GPOUT0;
@@ -1603,7 +1610,7 @@ static int snd_emu10k1_shared_spdif_put(struct snd_kcontrol *kcontrol,
}
}
reg = inl(emu->port + HCFG);
- val = ucontrol->value.integer.value[0] ? HCFG_GPOUT0 : 0;
+ val = sw ? HCFG_GPOUT0 : 0;
change |= (reg & HCFG_GPOUT0) != val;
if (change) {
reg &= ~HCFG_GPOUT0;
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index b3a618e..6ba7ac0 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -285,6 +285,7 @@ struct azx_dev {
u32 *posbuf; /* position buffer pointer */
unsigned int bufsize; /* size of the play buffer in bytes */
+ unsigned int period_bytes; /* size of the period in bytes */
unsigned int frags; /* number for period in the play buffer */
unsigned int fifo_size; /* FIFO size */
@@ -301,11 +302,10 @@ struct azx_dev {
*/
unsigned char stream_tag; /* assigned stream */
unsigned char index; /* stream index */
- /* for sanity check of position buffer */
- unsigned int period_intr;
unsigned int opened :1;
unsigned int running :1;
+ unsigned int irq_pending: 1;
};
/* CORB/RIRB */
@@ -369,6 +369,9 @@ struct azx {
/* for debugging */
unsigned int last_cmd; /* last issued command (to sync) */
+
+ /* for pending irqs */
+ struct work_struct irq_pending_work;
};
/* driver types */
@@ -908,6 +911,8 @@ static void azx_init_pci(struct azx *chip)
}
+static int azx_position_ok(struct azx *chip, struct azx_dev *azx_dev);
+
/*
* interrupt handler
*/
@@ -930,11 +935,18 @@ static irqreturn_t azx_interrupt(int irq, void *dev_id)
azx_dev = &chip->azx_dev[i];
if (status & azx_dev->sd_int_sta_mask) {
azx_sd_writeb(azx_dev, SD_STS, SD_INT_MASK);
- if (azx_dev->substream && azx_dev->running) {
- azx_dev->period_intr++;
+ if (!azx_dev->substream || !azx_dev->running)
+ continue;
+ /* check whether this IRQ is really acceptable */
+ if (azx_position_ok(chip, azx_dev)) {
+ azx_dev->irq_pending = 0;
spin_unlock(&chip->reg_lock);
snd_pcm_period_elapsed(azx_dev->substream);
spin_lock(&chip->reg_lock);
+ } else {
+ /* bogus IRQ, process it later */
+ azx_dev->irq_pending = 1;
+ schedule_work(&chip->irq_pending_work);
}
}
}
@@ -973,6 +985,7 @@ static int azx_setup_periods(struct snd_pcm_substream *substream,
azx_sd_writel(azx_dev, SD_BDLPU, 0);
period_bytes = snd_pcm_lib_period_bytes(substream);
+ azx_dev->period_bytes = period_bytes;
periods = azx_dev->bufsize / period_bytes;
/* program the initial BDL entries */
@@ -1421,27 +1434,16 @@ static int azx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
return 0;
}
-static snd_pcm_uframes_t azx_pcm_pointer(struct snd_pcm_substream *substream)
+static unsigned int azx_get_position(struct azx *chip,
+ struct azx_dev *azx_dev)
{
- struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
- struct azx *chip = apcm->chip;
- struct azx_dev *azx_dev = get_azx_dev(substream);
unsigned int pos;
if (chip->position_fix == POS_FIX_POSBUF ||
chip->position_fix == POS_FIX_AUTO) {
/* use the position buffer */
pos = le32_to_cpu(*azx_dev->posbuf);
- if (chip->position_fix == POS_FIX_AUTO &&
- azx_dev->period_intr == 1 && !pos) {
- printk(KERN_WARNING
- "hda-intel: Invalid position buffer, "
- "using LPIB read method instead.\n");
- chip->position_fix = POS_FIX_NONE;
- goto read_lpib;
- }
} else {
- read_lpib:
/* read LPIB */
pos = azx_sd_readl(azx_dev, SD_LPIB);
if (chip->position_fix == POS_FIX_FIFO)
@@ -1449,7 +1451,90 @@ static snd_pcm_uframes_t azx_pcm_pointer(struct snd_pcm_substream *substream)
}
if (pos >= azx_dev->bufsize)
pos = 0;
- return bytes_to_frames(substream->runtime, pos);
+ return pos;
+}
+
+static snd_pcm_uframes_t azx_pcm_pointer(struct snd_pcm_substream *substream)
+{
+ struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
+ struct azx *chip = apcm->chip;
+ struct azx_dev *azx_dev = get_azx_dev(substream);
+ return bytes_to_frames(substream->runtime,
+ azx_get_position(chip, azx_dev));
+}
+
+/*
+ * Check whether the current DMA position is acceptable for updating
+ * periods. Returns non-zero if it's OK.
+ *
+ * Many HD-audio controllers appear pretty inaccurate about
+ * the update-IRQ timing. The IRQ is issued before actually the
+ * data is processed. So, we need to process it afterwords in a
+ * workqueue.
+ */
+static int azx_position_ok(struct azx *chip, struct azx_dev *azx_dev)
+{
+ unsigned int pos;
+
+ pos = azx_get_position(chip, azx_dev);
+ if (chip->position_fix == POS_FIX_AUTO) {
+ if (!pos) {
+ printk(KERN_WARNING
+ "hda-intel: Invalid position buffer, "
+ "using LPIB read method instead.\n");
+ chip->position_fix = POS_FIX_NONE;
+ pos = azx_get_position(chip, azx_dev);
+ } else
+ chip->position_fix = POS_FIX_POSBUF;
+ }
+
+ if (pos % azx_dev->period_bytes > azx_dev->period_bytes / 2)
+ return 0; /* NG - it's below the period boundary */
+ return 1; /* OK, it's fine */
+}
+
+/*
+ * The work for pending PCM period updates.
+ */
+static void azx_irq_pending_work(struct work_struct *work)
+{
+ struct azx *chip = container_of(work, struct azx, irq_pending_work);
+ int i, pending;
+
+ for (;;) {
+ pending = 0;
+ spin_lock_irq(&chip->reg_lock);
+ for (i = 0; i < chip->num_streams; i++) {
+ struct azx_dev *azx_dev = &chip->azx_dev[i];
+ if (!azx_dev->irq_pending ||
+ !azx_dev->substream ||
+ !azx_dev->running)
+ continue;
+ if (azx_position_ok(chip, azx_dev)) {
+ azx_dev->irq_pending = 0;
+ spin_unlock(&chip->reg_lock);
+ snd_pcm_period_elapsed(azx_dev->substream);
+ spin_lock(&chip->reg_lock);
+ } else
+ pending++;
+ }
+ spin_unlock_irq(&chip->reg_lock);
+ if (!pending)
+ return;
+ cond_resched();
+ }
+}
+
+/* clear irq_pending flags and assure no on-going workq */
+static void azx_clear_irq_pending(struct azx *chip)
+{
+ int i;
+
+ spin_lock_irq(&chip->reg_lock);
+ for (i = 0; i < chip->num_streams; i++)
+ chip->azx_dev[i].irq_pending = 0;
+ spin_unlock_irq(&chip->reg_lock);
+ flush_scheduled_work();
}
static struct snd_pcm_ops azx_pcm_ops = {
@@ -1676,6 +1761,7 @@ static int azx_suspend(struct pci_dev *pci, pm_message_t state)
int i;
snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
+ azx_clear_irq_pending(chip);
for (i = 0; i < AZX_MAX_PCMS; i++)
snd_pcm_suspend_all(chip->pcm[i]);
if (chip->initialized)
@@ -1732,6 +1818,7 @@ static int azx_free(struct azx *chip)
int i;
if (chip->initialized) {
+ azx_clear_irq_pending(chip);
for (i = 0; i < chip->num_streams; i++)
azx_stream_stop(chip, &chip->azx_dev[i]);
azx_stop_chip(chip);
@@ -1857,6 +1944,7 @@ static int __devinit azx_create(struct snd_card *card, struct pci_dev *pci,
chip->irq = -1;
chip->driver_type = driver_type;
chip->msi = enable_msi;
+ INIT_WORK(&chip->irq_pending_work, azx_irq_pending_work);
chip->position_fix = check_position_fix(chip, position_fix[dev]);
check_probe_mask(chip, dev);
diff --git a/sound/pci/hda/patch_analog.c b/sound/pci/hda/patch_analog.c
index a99e86d..b5f655d 100644
--- a/sound/pci/hda/patch_analog.c
+++ b/sound/pci/hda/patch_analog.c
@@ -1618,6 +1618,7 @@ static const char *ad1981_models[AD1981_MODELS] = {
static struct snd_pci_quirk ad1981_cfg_tbl[] = {
SND_PCI_QUIRK(0x1014, 0x0597, "Lenovo Z60", AD1981_THINKPAD),
+ SND_PCI_QUIRK(0x1014, 0x05b7, "Lenovo Z60m", AD1981_THINKPAD),
/* All HP models */
SND_PCI_QUIRK(0x103c, 0, "HP nx", AD1981_HP),
SND_PCI_QUIRK(0x1179, 0x0001, "Toshiba U205", AD1981_TOSHIBA),
@@ -2623,7 +2624,7 @@ static int ad1988_auto_create_extra_out(struct hda_codec *codec, hda_nid_t pin,
{
struct ad198x_spec *spec = codec->spec;
hda_nid_t nid;
- int idx, err;
+ int i, idx, err;
char name[32];
if (! pin)
@@ -2631,16 +2632,26 @@ static int ad1988_auto_create_extra_out(struct hda_codec *codec, hda_nid_t pin,
idx = ad1988_pin_idx(pin);
nid = ad1988_idx_to_dac(codec, idx);
- /* specify the DAC as the extra output */
- if (! spec->multiout.hp_nid)
- spec->multiout.hp_nid = nid;
- else
- spec->multiout.extra_out_nid[0] = nid;
- /* control HP volume/switch on the output mixer amp */
- sprintf(name, "%s Playback Volume", pfx);
- if ((err = add_control(spec, AD_CTL_WIDGET_VOL, name,
- HDA_COMPOSE_AMP_VAL(nid, 3, 0, HDA_OUTPUT))) < 0)
- return err;
+ /* check whether the corresponding DAC was already taken */
+ for (i = 0; i < spec->autocfg.line_outs; i++) {
+ hda_nid_t pin = spec->autocfg.line_out_pins[i];
+ hda_nid_t dac = ad1988_idx_to_dac(codec, ad1988_pin_idx(pin));
+ if (dac == nid)
+ break;
+ }
+ if (i >= spec->autocfg.line_outs) {
+ /* specify the DAC as the extra output */
+ if (!spec->multiout.hp_nid)
+ spec->multiout.hp_nid = nid;
+ else
+ spec->multiout.extra_out_nid[0] = nid;
+ /* control HP volume/switch on the output mixer amp */
+ sprintf(name, "%s Playback Volume", pfx);
+ err = add_control(spec, AD_CTL_WIDGET_VOL, name,
+ HDA_COMPOSE_AMP_VAL(nid, 3, 0, HDA_OUTPUT));
+ if (err < 0)
+ return err;
+ }
nid = ad1988_mixer_nids[idx];
sprintf(name, "%s Playback Switch", pfx);
if ((err = add_control(spec, AD_CTL_BIND_MUTE, name,
On Wed, 6 Aug 2008 10:55:29 -0700, Greg KH <[email protected]> wrote:
> The updated 2.6.26.y git tree can be found at:
> git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-2.6.26.y.git
> and can be browsed at the normal kernel.org git web browser:
> http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.26.y.git;a=summary
I cannot clone the tree via http protocol.
$ git-clone --reference linux-2.6 http://www.kernel.org/pub/scm/linux/kernel/git/stable/linux-2.6.26.y.git
Initialized empty Git repository in /home/git/linux-2.6.26.y/.git/
Cannot get remote repository information.
Perhaps git-update-server-info needs to be run there?
I can clone 2.6.25.y tree vit http.
---
Atsushi Nemoto
On Fri, Aug 08, 2008 at 12:27:49AM +0900, Atsushi Nemoto wrote:
> On Wed, 6 Aug 2008 10:55:29 -0700, Greg KH <[email protected]> wrote:
> > The updated 2.6.26.y git tree can be found at:
> > git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-2.6.26.y.git
> > and can be browsed at the normal kernel.org git web browser:
> > http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.26.y.git;a=summary
>
> I cannot clone the tree via http protocol.
>
> $ git-clone --reference linux-2.6 http://www.kernel.org/pub/scm/linux/kernel/git/stable/linux-2.6.26.y.git
> Initialized empty Git repository in /home/git/linux-2.6.26.y/.git/
> Cannot get remote repository information.
> Perhaps git-update-server-info needs to be run there?
>
> I can clone 2.6.25.y tree vit http.
Bah, sorry, my fault, it should be fixed now, and I've enabled the hook
to run this for any future pushes.
thanks,
greg k-h