(Ingo, I apologize for the duplicate emails. I did not have my email config
set up properly and was thus getting rejected by lkml.)
I have attached a patch to add realtime support for PowerPC (32 bit
only). The patch applies over Ingo's real-time preempt patch:
http://people.redhat.com/mingo/realtime-preempt/realtime-preempt-2.6.11-rc4-V0.7.39-02
This patch has been tested on the IBM PPC 405GP eval board only.
You might notice that this board is not an SMP board. A few small
changes were required to build an SMP kernel, even though only one cpu
is actually active. I can supply a patch of the SMP related changes if
anyone desires it.
The testing has included a short (~ten minute) stress test for eight
configuration permutations. The permutations are:
SMP=n SMP=y
------- -------
PREEMPT_NONE pn pn_smp
PREEMPT_VOLUNTARY pv pv_smp
PREEMPT_DESKTOP pd pd_smp
PREEMPT_RT pr pr_smp
Any comments, suggestions, needed changes, etc are welcome.
Thanks,
-Frank
Frank Rowand <[email protected]>
MontaVista Software, Inc
Source: MontaVista Software, Inc.
Signed-off-by: Frank Rowand <[email protected]>
Index: linux-2.6.10/arch/ppc/Kconfig
===================================================================
--- linux-2.6.10.orig/arch/ppc/Kconfig
+++ linux-2.6.10/arch/ppc/Kconfig
@@ -17,9 +17,16 @@ config GENERIC_HARDIRQS
config RWSEM_GENERIC_SPINLOCK
bool
+ depends on !PREEMPT_RT
+
+config ASM_SEMAPHORES
+ bool
+ depends on !PREEMPT_RT
+ default y
config RWSEM_XCHGADD_ALGORITHM
bool
+ depends on !RWSEM_GENERIC_SPINLOCK && !PREEMPT_RT
default y
config GENERIC_CALIBRATE_DELAY
@@ -862,15 +869,7 @@ config NR_CPUS
depends on SMP
default "4"
-config PREEMPT
- bool "Preemptible Kernel"
- help
- This option reduces the latency of the kernel when reacting to
- real-time or interactive events by allowing a low priority process to
- be preempted even if it is in kernel mode executing a system call.
-
- Say Y here if you are building a kernel for a desktop, embedded
- or real-time system. Say N if you are unsure.
+source "lib/Kconfig.RT"
config HIGHMEM
bool "High memory support"
Index: linux-2.6.10/arch/ppc/platforms/prpmc800.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/platforms/prpmc800.c
+++ linux-2.6.10/arch/ppc/platforms/prpmc800.c
@@ -331,6 +331,7 @@ static void __init prpmc800_calibrate_de
tb_ticks_per_second = 100000000 / 4;
tb_ticks_per_jiffy = tb_ticks_per_second / HZ;
tb_to_us = mulhwu_scale_factor(tb_ticks_per_second, 1000000);
+ us_to_tb = tb_ticks_per_second / 1000000;
return;
}
@@ -371,6 +372,7 @@ static void __init prpmc800_calibrate_de
tb_ticks_per_second = (tbl_end - tbl_start) * 2;
tb_ticks_per_jiffy = tb_ticks_per_second / HZ;
tb_to_us = mulhwu_scale_factor(tb_ticks_per_second, 1000000);
+ us_to_tb = tb_ticks_per_second / 1000000;
}
static void prpmc800_restart(char *cmd)
Index: linux-2.6.10/arch/ppc/syslib/m8xx_setup.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/syslib/m8xx_setup.c
+++ linux-2.6.10/arch/ppc/syslib/m8xx_setup.c
@@ -163,6 +163,7 @@ void __init m8xx_calibrate_decr(void)
printk("Decrementer Frequency = %d/%d\n", freq, divisor);
tb_ticks_per_jiffy = freq / HZ / divisor;
tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
+ us_to_tb = (freq / divisor) / 1000000;
/* Perform some more timer/timebase initialization. This used
* to be done elsewhere, but other changes caused it to get
Index: linux-2.6.10/arch/ppc/platforms/chrp_time.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/platforms/chrp_time.c
+++ linux-2.6.10/arch/ppc/platforms/chrp_time.c
@@ -191,4 +191,5 @@ void __init chrp_calibrate_decr(void)
freq/1000000, freq%1000000);
tb_ticks_per_jiffy = freq / HZ;
tb_to_us = mulhwu_scale_factor(freq, 1000000);
+ us_to_tb = freq / 1000000;
}
Index: linux-2.6.10/arch/ppc/platforms/gemini_setup.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/platforms/gemini_setup.c
+++ linux-2.6.10/arch/ppc/platforms/gemini_setup.c
@@ -465,6 +465,7 @@ void __init gemini_calibrate_decr(void)
divisor = 4;
tb_ticks_per_jiffy = freq / HZ / divisor;
tb_to_us = mulhwu_scale_factor(freq/divisor, 1000000);
+ us_to_tb = (freq / divisor) / 1000000;
}
unsigned long __init gemini_find_end_of_memory(void)
Index: linux-2.6.10/include/asm-ppc/time.h
===================================================================
--- linux-2.6.10.orig/include/asm-ppc/time.h
+++ linux-2.6.10/include/asm-ppc/time.h
@@ -20,6 +20,7 @@
extern unsigned tb_ticks_per_jiffy;
extern unsigned tb_to_us;
extern unsigned tb_last_stamp;
+extern unsigned us_to_tb;
extern unsigned long disarm_decr[NR_CPUS];
extern void to_tm(int tim, struct rtc_time * tm);
Index: linux-2.6.10/arch/ppc/platforms/pmac_time.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/platforms/pmac_time.c
+++ linux-2.6.10/arch/ppc/platforms/pmac_time.c
@@ -198,6 +198,7 @@ via_calibrate_decr(void)
tb_ticks_per_jiffy = (dstart - dend) / (6 * (HZ/100));
tb_to_us = mulhwu_scale_factor(dstart - dend, 60000);
+ us_to_tb = (dstart - dend) / 60000;
printk(KERN_INFO "via_calibrate_decr: ticks per jiffy = %u (%u ticks)\n",
tb_ticks_per_jiffy, dstart - dend);
@@ -289,4 +290,5 @@ pmac_calibrate_decr(void)
freq/1000000, freq%1000000);
tb_ticks_per_jiffy = freq / HZ;
tb_to_us = mulhwu_scale_factor(freq, 1000000);
+ us_to_tb = freq / 1000000;
}
Index: linux-2.6.10/arch/ppc/platforms/apus_setup.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/platforms/apus_setup.c
+++ linux-2.6.10/arch/ppc/platforms/apus_setup.c
@@ -282,6 +282,7 @@ void apus_calibrate_decr(void)
freq/1000000, freq%1000000);
tb_ticks_per_jiffy = freq / HZ;
tb_to_us = mulhwu_scale_factor(freq, 1000000);
+ us_to_tb = freq / 1000000;
__bus_speed = bus_speed;
__speed_test_failed = speed_test_failed;
Index: linux-2.6.10/arch/ppc/platforms/k2.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/platforms/k2.c
+++ linux-2.6.10/arch/ppc/platforms/k2.c
@@ -411,6 +411,7 @@ static void __init k2_calibrate_decr(voi
freq = k2_get_bus_speed();
tb_ticks_per_jiffy = freq / HZ / divisor;
tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
+ us_to_tb = (freq / divisor) / 1000000;
}
static int k2_show_cpuinfo(struct seq_file *m)
Index: linux-2.6.10/arch/ppc/platforms/powerpmc250.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/platforms/powerpmc250.c
+++ linux-2.6.10/arch/ppc/platforms/powerpmc250.c
@@ -167,6 +167,7 @@ powerpmc250_calibrate_decr(void)
tb_ticks_per_jiffy = freq / (HZ * divisor);
tb_to_us = mulhwu_scale_factor(freq/divisor, 1000000);
+ us_to_tb = (freq / divisor) / 1000000;
}
static void
Index: linux-2.6.10/arch/ppc/syslib/m8260_setup.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/syslib/m8260_setup.c
+++ linux-2.6.10/arch/ppc/syslib/m8260_setup.c
@@ -78,6 +78,7 @@ m8260_calibrate_decr(void)
divisor = 4;
tb_ticks_per_jiffy = freq / HZ / divisor;
tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
+ us_to_tb = (freq / divisor) / 1000000;
}
/* The 8260 has an internal 1-second timer update register that
Index: linux-2.6.10/arch/ppc/syslib/ibm44x_common.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/syslib/ibm44x_common.c
+++ linux-2.6.10/arch/ppc/syslib/ibm44x_common.c
@@ -60,6 +60,7 @@ void __init ibm44x_calibrate_decr(unsign
{
tb_ticks_per_jiffy = freq / HZ;
tb_to_us = mulhwu_scale_factor(freq, 1000000);
+ us_to_tb = freq / 1000000;
/* Set the time base to zero */
mtspr(SPRN_TBWL, 0);
Index: linux-2.6.10/arch/ppc/platforms/prpmc750.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/platforms/prpmc750.c
+++ linux-2.6.10/arch/ppc/platforms/prpmc750.c
@@ -271,6 +271,7 @@ static void __init prpmc750_calibrate_de
tb_ticks_per_jiffy = freq / (HZ * divisor);
tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
+ us_to_tb = (freq / divisor) / 1000000;
}
static void prpmc750_restart(char *cmd)
Index: linux-2.6.10/arch/ppc/platforms/prep_setup.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/platforms/prep_setup.c
+++ linux-2.6.10/arch/ppc/platforms/prep_setup.c
@@ -938,6 +938,7 @@ prep_calibrate_decr(void)
(freq/divisor)/1000000,
(freq/divisor)%1000000);
tb_to_us = mulhwu_scale_factor(freq/divisor, 1000000);
+ us_to_tb = (freq / divisor) / 1000000;
tb_ticks_per_jiffy = freq / HZ / divisor;
}
}
Index: linux-2.6.10/arch/ppc/platforms/spruce.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/platforms/spruce.c
+++ linux-2.6.10/arch/ppc/platforms/spruce.c
@@ -150,6 +150,7 @@ spruce_calibrate_decr(void)
freq = SPRUCE_BUS_SPEED;
tb_ticks_per_jiffy = freq / HZ / divisor;
tb_to_us = mulhwu_scale_factor(freq/divisor, 1000000);
+ us_to_tb = (freq / divisor) / 1000000;
}
static int
Index: linux-2.6.10/arch/ppc/syslib/mpc52xx_setup.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/syslib/mpc52xx_setup.c
+++ linux-2.6.10/arch/ppc/syslib/mpc52xx_setup.c
@@ -220,6 +220,7 @@ mpc52xx_calibrate_decr(void)
tb_ticks_per_jiffy = xlbfreq / HZ / divisor;
tb_to_us = mulhwu_scale_factor(xlbfreq / divisor, 1000000);
+ us_to_tb = (xlbfreq / divisor) / 1000000;
}
Index: linux-2.6.10/arch/ppc/kernel/smp.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/kernel/smp.c
+++ linux-2.6.10/arch/ppc/kernel/smp.c
@@ -139,6 +139,11 @@ void smp_send_reschedule(int cpu)
smp_message_pass(cpu, PPC_MSG_RESCHEDULE, 0, 0);
}
+void smp_send_reschedule_allbutself(void)
+{
+ smp_message_pass(MSG_ALL_BUT_SELF, PPC_MSG_RESCHEDULE, 0, 0);
+}
+
#ifdef CONFIG_XMON
void smp_send_xmon_break(int cpu)
{
@@ -163,7 +168,7 @@ void smp_send_stop(void)
* static memory requirements. It also looks cleaner.
* Stolen from the i386 version.
*/
-static DEFINE_SPINLOCK(call_lock);
+static DEFINE_RAW_SPINLOCK(call_lock);
static struct call_data_struct {
void (*func) (void *info);
Index: linux-2.6.10/arch/ppc/kernel/time.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/kernel/time.c
+++ linux-2.6.10/arch/ppc/kernel/time.c
@@ -86,12 +86,13 @@ unsigned tb_ticks_per_jiffy;
unsigned tb_to_us;
unsigned tb_last_stamp;
unsigned long tb_to_ns_scale;
+unsigned us_to_tb;
extern unsigned long wall_jiffies;
static long time_offset;
-DEFINE_SPINLOCK(rtc_lock);
+DEFINE_RAW_SPINLOCK(rtc_lock);
EXPORT_SYMBOL(rtc_lock);
@@ -296,6 +297,7 @@ void __init time_init(void)
tb_ticks_per_jiffy = DECREMENTER_COUNT_601;
/* mulhwu_scale_factor(1000000000, 1000000) is 0x418937 */
tb_to_us = 0x418937;
+ us_to_tb = 1000000000 / 1000000;
} else {
ppc_md.calibrate_decr();
tb_to_ns_scale = mulhwu(tb_to_us, 1000 << 10);
Index: linux-2.6.10/arch/ppc/platforms/ev64260.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/platforms/ev64260.c
+++ linux-2.6.10/arch/ppc/platforms/ev64260.c
@@ -552,6 +552,7 @@ ev64260_calibrate_decr(void)
tb_ticks_per_jiffy = freq / HZ;
tb_to_us = mulhwu_scale_factor(freq, 1000000);
+ us_to_tb = freq / 1000000;
return;
}
Index: linux-2.6.10/arch/ppc/syslib/ppc85xx_setup.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/syslib/ppc85xx_setup.c
+++ linux-2.6.10/arch/ppc/syslib/ppc85xx_setup.c
@@ -58,6 +58,7 @@ mpc85xx_calibrate_decr(void)
divisor = 8;
tb_ticks_per_jiffy = freq / divisor / HZ;
tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
+ us_to_tb = (freq / divisor) / 1000000;
/* Set the time base to zero */
mtspr(SPRN_TBWL, 0);
Index: linux-2.6.10/arch/ppc/syslib/todc_time.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/syslib/todc_time.c
+++ linux-2.6.10/arch/ppc/syslib/todc_time.c
@@ -504,6 +504,7 @@ todc_calibrate_decr(void)
tb_ticks_per_jiffy = freq / HZ;
tb_to_us = mulhwu_scale_factor(freq, 1000000);
+ us_to_tb = freq / 1000000;
return;
}
Index: linux-2.6.10/arch/ppc/platforms/adir_setup.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/platforms/adir_setup.c
+++ linux-2.6.10/arch/ppc/platforms/adir_setup.c
@@ -77,6 +77,7 @@ adir_calibrate_decr(void)
freq = adir_get_bus_speed();
tb_ticks_per_jiffy = freq / HZ / divisor;
tb_to_us = mulhwu_scale_factor(freq/divisor, 1000000);
+ us_to_tb = (freq / divisor) / 1000000;
}
static int
Index: linux-2.6.10/arch/ppc/syslib/ppc4xx_setup.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/syslib/ppc4xx_setup.c
+++ linux-2.6.10/arch/ppc/syslib/ppc4xx_setup.c
@@ -178,6 +178,7 @@ ppc4xx_calibrate_decr(void)
freq = bip->bi_tbfreq;
tb_ticks_per_jiffy = freq / HZ;
tb_to_us = mulhwu_scale_factor(freq, 1000000);
+ us_to_tb = freq / 1000000;
/* Set the time base to zero.
** At 200 Mhz, time base will rollover in ~2925 years.
Index: linux-2.6.10/include/linux/rt_lock.h
===================================================================
--- linux-2.6.10.orig/include/linux/rt_lock.h
+++ linux-2.6.10/include/linux/rt_lock.h
@@ -13,8 +13,13 @@
typedef struct {
volatile unsigned long lock;
# ifdef CONFIG_DEBUG_SPINLOCK
+# ifdef CONFIG_PPC32
+ volatile unsigned long owner_pc;
+ volatile unsigned long owner_cpu;
+# else
unsigned int magic;
# endif
+# endif
# ifdef CONFIG_PREEMPT
unsigned int break_lock;
# endif
Index: linux-2.6.10/arch/ppc/syslib/cpm2_common.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/syslib/cpm2_common.c
+++ linux-2.6.10/arch/ppc/syslib/cpm2_common.c
@@ -115,7 +115,7 @@ cpm2_fastbrg(uint brg, uint rate, int di
/*
* dpalloc / dpfree bits.
*/
-static spinlock_t cpm_dpmem_lock;
+static raw_spinlock_t cpm_dpmem_lock;
/* 16 blocks should be enough to satisfy all requests
* until the memory subsystem goes up... */
static rh_block_t cpm_boot_dpmem_rh_block[16];
Index: linux-2.6.10/arch/ppc/kernel/Makefile
===================================================================
--- linux-2.6.10.orig/arch/ppc/kernel/Makefile
+++ linux-2.6.10/arch/ppc/kernel/Makefile
@@ -13,8 +13,9 @@ extra-y += vmlinux.lds
obj-y := entry.o traps.o irq.o idle.o time.o misc.o \
process.o signal.o ptrace.o align.o \
- semaphore.o syscalls.o setup.o \
+ syscalls.o setup.o \
cputable.o ppc_htab.o perfmon.o
+obj-$(CONFIG_ASM_SEMAPHORES) += semaphore.o
obj-$(CONFIG_6xx) += l2cr.o cpu_setup_6xx.o
obj-$(CONFIG_POWER4) += cpu_setup_power4.o
obj-$(CONFIG_MODULES) += module.o ppc_ksyms.o
Index: linux-2.6.10/include/asm-ppc/rwsem.h
===================================================================
--- linux-2.6.10.orig/include/asm-ppc/rwsem.h
+++ linux-2.6.10/include/asm-ppc/rwsem.h
@@ -25,7 +25,7 @@ struct rw_semaphore {
#define RWSEM_WAITING_BIAS (-0x00010000)
#define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS
#define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)
- spinlock_t wait_lock;
+ raw_spinlock_t wait_lock;
struct list_head wait_list;
#if RWSEM_DEBUG
int debug;
@@ -42,7 +42,7 @@ struct rw_semaphore {
#endif
#define __RWSEM_INITIALIZER(name) \
- { RWSEM_UNLOCKED_VALUE, SPIN_LOCK_UNLOCKED, \
+ { RWSEM_UNLOCKED_VALUE, RAW_SPIN_LOCK_UNLOCKED, \
LIST_HEAD_INIT((name).wait_list) \
__RWSEM_DEBUG_INIT }
Index: linux-2.6.10/arch/ppc/lib/dec_and_lock.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/lib/dec_and_lock.c
+++ linux-2.6.10/arch/ppc/lib/dec_and_lock.c
@@ -19,7 +19,7 @@
*/
#ifndef ATOMIC_DEC_AND_LOCK
-int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock)
+int _atomic_dec_and_raw_spin_lock(atomic_t *atomic, raw_spinlock_t *lock)
{
int counter;
int newcount;
@@ -35,12 +35,12 @@ int _atomic_dec_and_lock(atomic_t *atomi
return 0;
}
- spin_lock(lock);
+ _raw_spin_lock(lock);
if (atomic_dec_and_test(atomic))
return 1;
- spin_unlock(lock);
+ _raw_spin_unlock(lock);
return 0;
}
-EXPORT_SYMBOL(_atomic_dec_and_lock);
+EXPORT_SYMBOL(_atomic_dec_and_raw_spin_lock);
#endif /* ATOMIC_DEC_AND_LOCK */
Index: linux-2.6.10/arch/ppc/8260_io/enet.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/8260_io/enet.c
+++ linux-2.6.10/arch/ppc/8260_io/enet.c
@@ -116,7 +116,7 @@ struct scc_enet_private {
scc_t *sccp;
struct net_device_stats stats;
uint tx_full;
- spinlock_t lock;
+ raw_spinlock_t lock;
};
static int scc_enet_open(struct net_device *dev);
Index: linux-2.6.10/arch/ppc/syslib/prom.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/syslib/prom.c
+++ linux-2.6.10/arch/ppc/syslib/prom.c
@@ -1397,7 +1397,7 @@ print_properties(struct device_node *np)
}
#endif
-static DEFINE_SPINLOCK(rtas_lock);
+static DEFINE_RAW_SPINLOCK(rtas_lock);
/* this can be called after setup -- Cort */
int __openfirmware
Index: linux-2.6.10/include/asm-ppc/semaphore.h
===================================================================
--- linux-2.6.10.orig/include/asm-ppc/semaphore.h
+++ linux-2.6.10/include/asm-ppc/semaphore.h
@@ -16,6 +16,10 @@
#ifdef __KERNEL__
+#ifdef CONFIG_PREEMPT_RT
+# include <linux/rt_lock.h>
+#else
+
#include <asm/atomic.h>
#include <asm/system.h>
#include <linux/wait.h>
@@ -106,6 +110,7 @@ extern inline void up(struct semaphore *
__up(sem);
}
+#endif /* CONFIG_PREEMPT_RT */
#endif /* __KERNEL__ */
#endif /* !(_PPC_SEMAPHORE_H) */
Index: linux-2.6.10/arch/ppc/8260_io/fcc_enet.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/8260_io/fcc_enet.c
+++ linux-2.6.10/arch/ppc/8260_io/fcc_enet.c
@@ -322,7 +322,7 @@ struct fcc_enet_private {
volatile fcc_enet_t *ep;
struct net_device_stats stats;
uint tx_full;
- spinlock_t lock;
+ raw_spinlock_t lock;
#ifdef CONFIG_USE_MDIO
uint phy_id;
Index: linux-2.6.10/include/asm-ppc/ocp.h
===================================================================
--- linux-2.6.10.orig/include/asm-ppc/ocp.h
+++ linux-2.6.10/include/asm-ppc/ocp.h
@@ -29,10 +29,10 @@
#include <linux/config.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/device.h>
+#include <linux/rwsem.h>
#include <asm/mmu.h>
#include <asm/ocp_ids.h>
-#include <asm/rwsem.h>
#include <asm/semaphore.h>
#ifdef CONFIG_PPC_OCP
Index: linux-2.6.10/arch/ppc/8xx_io/enet.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/8xx_io/enet.c
+++ linux-2.6.10/arch/ppc/8xx_io/enet.c
@@ -144,7 +144,7 @@ struct scc_enet_private {
unsigned char *rx_vaddr[RX_RING_SIZE];
struct net_device_stats stats;
uint tx_full;
- spinlock_t lock;
+ raw_spinlock_t lock;
};
static int scc_enet_open(struct net_device *dev);
Index: linux-2.6.10/arch/ppc/syslib/open_pic.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/syslib/open_pic.c
+++ linux-2.6.10/arch/ppc/syslib/open_pic.c
@@ -531,7 +531,7 @@ void openpic_reset_processor_phys(u_int
}
#if defined(CONFIG_SMP) || defined(CONFIG_PM)
-static DEFINE_SPINLOCK(openpic_setup_lock);
+static DEFINE_RAW_SPINLOCK(openpic_setup_lock);
#endif
#ifdef CONFIG_SMP
Index: linux-2.6.10/arch/ppc/platforms/pmac_feature.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/platforms/pmac_feature.c
+++ linux-2.6.10/arch/ppc/platforms/pmac_feature.c
@@ -63,7 +63,7 @@ extern struct device_node *k2_skiplist[2
* We use a single global lock to protect accesses. Each driver has
* to take care of its own locking
*/
-static DEFINE_SPINLOCK(feature_lock __pmacdata);
+static DEFINE_RAW_SPINLOCK(feature_lock __pmacdata);
#define LOCK(flags) spin_lock_irqsave(&feature_lock, flags);
#define UNLOCK(flags) spin_unlock_irqrestore(&feature_lock, flags);
Index: linux-2.6.10/arch/ppc/8xx_io/commproc.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/8xx_io/commproc.c
+++ linux-2.6.10/arch/ppc/8xx_io/commproc.c
@@ -372,7 +372,7 @@ cpm_setbrg(uint brg, uint rate)
/*
* dpalloc / dpfree bits.
*/
-static spinlock_t cpm_dpmem_lock;
+static raw_spinlock_t cpm_dpmem_lock;
/*
* 16 blocks should be enough to satisfy all requests
* until the memory subsystem goes up...
Index: linux-2.6.10/arch/ppc/syslib/open_pic2.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/syslib/open_pic2.c
+++ linux-2.6.10/arch/ppc/syslib/open_pic2.c
@@ -386,7 +386,7 @@ static void openpic2_set_spurious(u_int
vec);
}
-static DEFINE_SPINLOCK(openpic2_setup_lock);
+static DEFINE_RAW_SPINLOCK(openpic2_setup_lock);
/*
* Initialize a timer interrupt (and disable it)
Index: linux-2.6.10/arch/ppc/platforms/pmac_nvram.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/platforms/pmac_nvram.c
+++ linux-2.6.10/arch/ppc/platforms/pmac_nvram.c
@@ -80,7 +80,7 @@ static volatile unsigned char *nvram_dat
static int nvram_mult, is_core_99;
static int core99_bank = 0;
static int nvram_partitions[3];
-static DEFINE_SPINLOCK(nv_lock);
+static DEFINE_RAW_SPINLOCK(nv_lock);
extern int pmac_newworld;
extern int system_running;
Index: linux-2.6.10/include/asm-ppc/tlb.h
===================================================================
--- linux-2.6.10.orig/include/asm-ppc/tlb.h
+++ linux-2.6.10/include/asm-ppc/tlb.h
@@ -25,7 +25,11 @@ struct mmu_gather;
extern void tlb_flush(struct mmu_gather *tlb);
/* Get the generic bits... */
+#ifdef CONFIG_PREEMPT_RT
+#include <asm-generic/tlb-simple.h>
+#else
#include <asm-generic/tlb.h>
+#endif
/* Nothing needed here in fact... */
#define tlb_start_vma(tlb, vma) do { } while (0)
@@ -50,7 +54,11 @@ static inline void __tlb_remove_tlb_entr
#define tlb_flush(tlb) flush_tlb_mm((tlb)->mm)
/* Get the generic bits... */
+#ifdef CONFIG_PREEMPT_RT
+#include <asm-generic/tlb-simple.h>
+#else
#include <asm-generic/tlb.h>
+#endif
#endif /* CONFIG_PPC_STD_MMU */
Index: linux-2.6.10/arch/ppc/kernel/traps.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/kernel/traps.c
+++ linux-2.6.10/arch/ppc/kernel/traps.c
@@ -72,7 +72,7 @@ void (*debugger_fault_handler)(struct pt
* Trap & Exception support
*/
-DEFINE_SPINLOCK(die_lock);
+DEFINE_RAW_SPINLOCK(die_lock);
void die(const char * str, struct pt_regs * fp, long err)
{
Index: linux-2.6.10/arch/ppc/platforms/sbc82xx.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/platforms/sbc82xx.c
+++ linux-2.6.10/arch/ppc/platforms/sbc82xx.c
@@ -68,7 +68,7 @@ static void sbc82xx_time_init(void)
static volatile char *sbc82xx_i8259_map;
static char sbc82xx_i8259_mask = 0xff;
-static DEFINE_SPINLOCK(sbc82xx_i8259_lock);
+static DEFINE_RAW_SPINLOCK(sbc82xx_i8259_lock);
static void sbc82xx_i8259_mask_and_ack_irq(unsigned int irq_nr)
{
Index: linux-2.6.10/arch/ppc/platforms/chrp_smp.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/platforms/chrp_smp.c
+++ linux-2.6.10/arch/ppc/platforms/chrp_smp.c
@@ -57,7 +57,7 @@ smp_chrp_setup_cpu(int cpu_nr)
do_openpic_setup_cpu();
}
-static DEFINE_SPINLOCK(timebase_lock);
+static DEFINE_RAW_SPINLOCK(timebase_lock);
static unsigned int timebase_upper = 0, timebase_lower = 0;
void __devinit
Index: linux-2.6.10/include/asm-ppc/hw_irq.h
===================================================================
--- linux-2.6.10.orig/include/asm-ppc/hw_irq.h
+++ linux-2.6.10/include/asm-ppc/hw_irq.h
@@ -13,6 +13,7 @@ extern void timer_interrupt(struct pt_re
#define INLINE_IRQS
#define irqs_disabled() ((mfmsr() & MSR_EE) == 0)
+#define irqs_disabled_flags(flags) ((flags & MSR_EE) == 0)
#ifdef INLINE_IRQS
Index: linux-2.6.10/include/asm-ppc/spinlock.h
===================================================================
--- linux-2.6.10.orig/include/asm-ppc/spinlock.h
+++ linux-2.6.10/include/asm-ppc/spinlock.h
@@ -7,17 +7,6 @@
* Simple spin lock operations.
*/
-typedef struct {
- volatile unsigned long lock;
-#ifdef CONFIG_DEBUG_SPINLOCK
- volatile unsigned long owner_pc;
- volatile unsigned long owner_cpu;
-#endif
-#ifdef CONFIG_PREEMPT
- unsigned int break_lock;
-#endif
-} spinlock_t;
-
#ifdef __KERNEL__
#ifdef CONFIG_DEBUG_SPINLOCK
#define SPINLOCK_DEBUG_INIT , 0, 0
@@ -25,16 +14,18 @@ typedef struct {
#define SPINLOCK_DEBUG_INIT /* */
#endif
-#define SPIN_LOCK_UNLOCKED (spinlock_t) { 0 SPINLOCK_DEBUG_INIT }
+#define __RAW_SPIN_LOCK_UNLOCKED { 0 SPINLOCK_DEBUG_INIT }
+#define RAW_SPIN_LOCK_UNLOCKED (raw_spinlock_t) __RAW_SPIN_LOCK_UNLOCKED
-#define spin_lock_init(x) do { *(x) = SPIN_LOCK_UNLOCKED; } while(0)
-#define spin_is_locked(x) ((x)->lock != 0)
-#define spin_unlock_wait(x) do { barrier(); } while(spin_is_locked(x))
-#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock)
+#define __raw_spin_lock_init(x) do { *(x) = RAW_SPIN_LOCK_UNLOCKED; } while(0)
+#define __raw_spin_is_locked(x) ((x)->lock != 0)
+#define __raw_spin_unlock_wait(x) \
+ do { barrier(); } while(__raw_spin_is_locked(x))
+#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock)
#ifndef CONFIG_DEBUG_SPINLOCK
-static inline void _raw_spin_lock(spinlock_t *lock)
+static inline void __raw_spin_lock(raw_spinlock_t *lock)
{
unsigned long tmp;
@@ -55,48 +46,32 @@ static inline void _raw_spin_lock(spinlo
: "cr0", "memory");
}
-static inline void _raw_spin_unlock(spinlock_t *lock)
+static inline void __raw_spin_unlock(raw_spinlock_t *lock)
{
__asm__ __volatile__("eieio # spin_unlock": : :"memory");
lock->lock = 0;
}
-#define _raw_spin_trylock(l) (!test_and_set_bit(0,&(l)->lock))
+#define __raw_spin_trylock(l) (!test_and_set_bit(0,&(l)->lock))
#else
-extern void _raw_spin_lock(spinlock_t *lock);
-extern void _raw_spin_unlock(spinlock_t *lock);
-extern int _raw_spin_trylock(spinlock_t *lock);
+extern void __raw_spin_lock(raw_spinlock_t *lock);
+extern void __raw_spin_unlock(raw_spinlock_t *lock);
+extern int __raw_spin_trylock(raw_spinlock_t *lock);
#endif
-/*
- * Read-write spinlocks, allowing multiple readers
- * but only one writer.
- *
- * NOTE! it is quite common to have readers in interrupts
- * but no interrupt writers. For those circumstances we
- * can "mix" irq-safe locks - any writer needs to get a
- * irq-safe write-lock, but readers can get non-irqsafe
- * read-locks.
- */
-typedef struct {
- volatile signed int lock;
-#ifdef CONFIG_PREEMPT
- unsigned int break_lock;
-#endif
-} rwlock_t;
-
-#define RW_LOCK_UNLOCKED (rwlock_t) { 0 }
-#define rwlock_init(lp) do { *(lp) = RW_LOCK_UNLOCKED; } while(0)
+#define __RAW_RW_LOCK_UNLOCKED { 0 }
+#define RAW_RW_LOCK_UNLOCKED (raw_rwlock_t) __RAW_RW_LOCK_UNLOCKED
+#define __raw_rwlock_init(lp) do { *(lp) = RAW_RW_LOCK_UNLOCKED; } while(0)
-#define read_can_lock(rw) ((rw)->lock >= 0)
-#define write_can_lock(rw) (!(rw)->lock)
+#define __raw_read_can_lock(rw) ((rw)->lock >= 0)
+#define __raw_write_can_lock(rw) (!(rw)->lock)
#ifndef CONFIG_DEBUG_SPINLOCK
-static __inline__ int _raw_read_trylock(rwlock_t *rw)
+static __inline__ int __raw_read_trylock(raw_rwlock_t *rw)
{
signed int tmp;
@@ -116,7 +91,7 @@ static __inline__ int _raw_read_trylock(
return tmp > 0;
}
-static __inline__ void _raw_read_lock(rwlock_t *rw)
+static __inline__ void __raw_read_lock(raw_rwlock_t *rw)
{
signed int tmp;
@@ -137,7 +112,7 @@ static __inline__ void _raw_read_lock(rw
: "cr0", "memory");
}
-static __inline__ void _raw_read_unlock(rwlock_t *rw)
+static __inline__ void __raw_read_unlock(raw_rwlock_t *rw)
{
signed int tmp;
@@ -153,7 +128,7 @@ static __inline__ void _raw_read_unlock(
: "cr0", "memory");
}
-static __inline__ int _raw_write_trylock(rwlock_t *rw)
+static __inline__ int __raw_write_trylock(raw_rwlock_t *rw)
{
signed int tmp;
@@ -173,7 +148,7 @@ static __inline__ int _raw_write_trylock
return tmp == 0;
}
-static __inline__ void _raw_write_lock(rwlock_t *rw)
+static __inline__ void __raw_write_lock(raw_rwlock_t *rw)
{
signed int tmp;
@@ -194,7 +169,7 @@ static __inline__ void _raw_write_lock(r
: "cr0", "memory");
}
-static __inline__ void _raw_write_unlock(rwlock_t *rw)
+static __inline__ void __raw_write_unlock(raw_rwlock_t *rw)
{
__asm__ __volatile__("eieio # write_unlock": : :"memory");
rw->lock = 0;
@@ -202,12 +177,12 @@ static __inline__ void _raw_write_unlock
#else
-extern void _raw_read_lock(rwlock_t *rw);
-extern void _raw_read_unlock(rwlock_t *rw);
-extern void _raw_write_lock(rwlock_t *rw);
-extern void _raw_write_unlock(rwlock_t *rw);
-extern int _raw_read_trylock(rwlock_t *rw);
-extern int _raw_write_trylock(rwlock_t *rw);
+extern void __raw_read_lock(raw_rwlock_t *rw);
+extern void __raw_read_unlock(raw_rwlock_t *rw);
+extern void __raw_write_lock(raw_rwlock_t *rw);
+extern void __raw_write_unlock(raw_rwlock_t *rw);
+extern int __raw_read_trylock(raw_rwlock_t *rw);
+extern int __raw_write_trylock(raw_rwlock_t *rw);
#endif
Index: linux-2.6.10/include/asm-ppc/dma.h
===================================================================
--- linux-2.6.10.orig/include/asm-ppc/dma.h
+++ linux-2.6.10/include/asm-ppc/dma.h
@@ -175,7 +175,7 @@ extern long ppc_cs4232_dma, ppc_cs4232_d
#define DMA_MODE_CASCADE 0xC0 /* pass thru DREQ->HRQ, DACK<-HLDA only */
#define DMA_AUTOINIT 0x10
-extern spinlock_t dma_spin_lock;
+extern raw_spinlock_t dma_spin_lock;
static __inline__ unsigned long claim_dma_lock(void)
{
Index: linux-2.6.10/arch/ppc/8xx_io/fec.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/8xx_io/fec.c
+++ linux-2.6.10/arch/ppc/8xx_io/fec.c
@@ -165,7 +165,7 @@ struct fec_enet_private {
struct net_device_stats stats;
uint tx_full;
- spinlock_t lock;
+ raw_spinlock_t lock;
#ifdef CONFIG_USE_MDIO
uint phy_id;
Index: linux-2.6.10/arch/ppc/lib/locks.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/lib/locks.c
+++ linux-2.6.10/arch/ppc/lib/locks.c
@@ -43,7 +43,7 @@ static inline unsigned long __spin_trylo
return ret;
}
-void _raw_spin_lock(spinlock_t *lock)
+void __raw_spin_lock(raw_spinlock_t *lock)
{
int cpu = smp_processor_id();
unsigned int stuck = INIT_STUCK;
@@ -63,9 +63,9 @@ void _raw_spin_lock(spinlock_t *lock)
lock->owner_pc = (unsigned long)__builtin_return_address(0);
lock->owner_cpu = cpu;
}
-EXPORT_SYMBOL(_raw_spin_lock);
+EXPORT_SYMBOL(__raw_spin_lock);
-int _raw_spin_trylock(spinlock_t *lock)
+int __raw_spin_trylock(raw_spinlock_t *lock)
{
if (__spin_trylock(&lock->lock))
return 0;
@@ -73,9 +73,9 @@ int _raw_spin_trylock(spinlock_t *lock)
lock->owner_pc = (unsigned long)__builtin_return_address(0);
return 1;
}
-EXPORT_SYMBOL(_raw_spin_trylock);
+EXPORT_SYMBOL(__raw_spin_trylock);
-void _raw_spin_unlock(spinlock_t *lp)
+void __raw_spin_unlock(raw_spinlock_t *lp)
{
if ( !lp->lock )
printk("_spin_unlock(%p): no lock cpu %d curr PC %p %s/%d\n",
@@ -89,13 +89,13 @@ void _raw_spin_unlock(spinlock_t *lp)
wmb();
lp->lock = 0;
}
-EXPORT_SYMBOL(_raw_spin_unlock);
+EXPORT_SYMBOL(__raw_spin_unlock);
/*
* For rwlocks, zero is unlocked, -1 is write-locked,
* positive is read-locked.
*/
-static __inline__ int __read_trylock(rwlock_t *rw)
+static __inline__ int __read_trylock(raw_rwlock_t *rw)
{
signed int tmp;
@@ -115,7 +115,7 @@ static __inline__ int __read_trylock(rwl
return tmp;
}
-int _raw_read_trylock(rwlock_t *rw)
+int __raw_read_trylock(raw_rwlock_t *rw)
{
return __read_trylock(rw) > 0;
}
@@ -136,9 +136,9 @@ void _raw_read_lock(rwlock_t *rw)
}
}
}
-EXPORT_SYMBOL(_raw_read_lock);
+EXPORT_SYMBOL(__raw_read_lock);
-void _raw_read_unlock(rwlock_t *rw)
+void __raw_read_unlock(raw_rwlock_t *rw)
{
if ( rw->lock == 0 )
printk("_read_unlock(): %s/%d (nip %08lX) lock %d\n",
@@ -147,9 +147,9 @@ void _raw_read_unlock(rwlock_t *rw)
wmb();
atomic_dec((atomic_t *) &(rw)->lock);
}
-EXPORT_SYMBOL(_raw_read_unlock);
+EXPORT_SYMBOL(__raw_read_unlock);
-void _raw_write_lock(rwlock_t *rw)
+void __raw_write_lock(raw_rwlock_t *rw)
{
unsigned int stuck;
@@ -165,18 +165,18 @@ void _raw_write_lock(rwlock_t *rw)
}
wmb();
}
-EXPORT_SYMBOL(_raw_write_lock);
+EXPORT_SYMBOL(__raw_write_lock);
-int _raw_write_trylock(rwlock_t *rw)
+int __raw_write_trylock(raw_rwlock_t *rw)
{
if (cmpxchg(&rw->lock, 0, -1) != 0)
return 0;
wmb();
return 1;
}
-EXPORT_SYMBOL(_raw_write_trylock);
+EXPORT_SYMBOL(__raw_write_trylock);
-void _raw_write_unlock(rwlock_t *rw)
+void __raw_write_unlock(raw_rwlock_t *rw)
{
if (rw->lock >= 0)
printk("_write_lock(): %s/%d (nip %08lX) lock %d\n",
@@ -185,6 +185,6 @@ void _raw_write_unlock(rwlock_t *rw)
wmb();
rw->lock = 0;
}
-EXPORT_SYMBOL(_raw_write_unlock);
+EXPORT_SYMBOL(__raw_write_unlock);
#endif
Index: linux-2.6.10/arch/ppc/kernel/ppc_ksyms.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/kernel/ppc_ksyms.c
+++ linux-2.6.10/arch/ppc/kernel/ppc_ksyms.c
@@ -295,9 +295,11 @@ EXPORT_SYMBOL(console_drivers);
EXPORT_SYMBOL(xmon);
EXPORT_SYMBOL(xmon_printf);
#endif
+#ifdef CONFIG_ASM_SEMAPHORES
EXPORT_SYMBOL(__up);
EXPORT_SYMBOL(__down);
EXPORT_SYMBOL(__down_interruptible);
+#endif
#if defined(CONFIG_KGDB) || defined(CONFIG_XMON)
extern void (*debugger)(struct pt_regs *regs);
Index: linux-2.6.10/arch/ppc/platforms/pmac_pic.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/platforms/pmac_pic.c
+++ linux-2.6.10/arch/ppc/platforms/pmac_pic.c
@@ -68,7 +68,7 @@ static int max_irqs __pmacdata;
static int max_real_irqs __pmacdata;
static u32 level_mask[4] __pmacdata;
-static DEFINE_SPINLOCK(pmac_pic_lock __pmacdata);
+static DEFINE_RAW_SPINLOCK(pmac_pic_lock __pmacdata);
#define GATWICK_IRQ_POOL_SIZE 10
Index: linux-2.6.10/arch/ppc/kernel/dma-mapping.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/kernel/dma-mapping.c
+++ linux-2.6.10/arch/ppc/kernel/dma-mapping.c
@@ -71,7 +71,7 @@ int map_page(unsigned long va, phys_addr
* This is the page table (2MB) covering uncached, DMA consistent allocations
*/
static pte_t *consistent_pte;
-static DEFINE_SPINLOCK(consistent_lock);
+static DEFINE_RAW_SPINLOCK(consistent_lock);
/*
* VM region handling support.
Index: linux-2.6.10/arch/ppc/syslib/ocp.c
===================================================================
--- linux-2.6.10.orig/arch/ppc/syslib/ocp.c
+++ linux-2.6.10/arch/ppc/syslib/ocp.c
@@ -45,11 +45,11 @@
#include <linux/pm.h>
#include <linux/bootmem.h>
#include <linux/device.h>
+#include <linux/rwsem.h>
#include <asm/io.h>
#include <asm/ocp.h>
#include <asm/errno.h>
-#include <asm/rwsem.h>
#include <asm/semaphore.h>
//#define DBG(x) printk x
Index: linux-2.6.10/drivers/net/ibm_emac/ibm_emac_core.c
===================================================================
--- linux-2.6.10.orig/drivers/net/ibm_emac/ibm_emac_core.c
+++ linux-2.6.10/drivers/net/ibm_emac/ibm_emac_core.c
@@ -912,7 +912,6 @@ static int emac_start_xmit(struct sk_buf
PKT_DEBUG(("emac_start_xmit() stopping queue\n"));
netif_stop_queue(dev);
spin_unlock_irqrestore(&fep->lock, flags);
- restore_flags(flags);
return -EBUSY;
}
* Frank Rowand <[email protected]> wrote:
> I have attached a patch to add realtime support for PowerPC (32 bit
> only). [...]
two comments:
- why is us_to_tb needed? It just seems to add alot of unnecessary
clutter to the patch, while it's not used anywhere.
- could you submit the drivers/net/ibm_emac/ibm_emac_core.c patch
upstream as well?
otherwise it looks pretty clean and straightforward.
Ingo
Ingo Molnar wrote:
> * Frank Rowand <[email protected]> wrote:
>
>
>>I have attached a patch to add realtime support for PowerPC (32 bit
>>only). [...]
>
>
> two comments:
>
> - why is us_to_tb needed? It just seems to add alot of unnecessary
> clutter to the patch, while it's not used anywhere.
Sorry, the usage of us_to_tb got dropped from the patch when I moved
it from one of my development trees to another. It gets used in
usecs_to_cycles(). The patch to add that is attached below.
Even with the usage of us_to_tb by usecs_to_cycles(), there is a lot
of added clutter for what is accomplished. I considered a nasty hack
to try to derive the proper value from other sources, but adding
us_to_tb seemed a lot easier to understand.
This patch also adds the dreaded #ifdefs, so I suspect it will not be
the correct implementation long term. I'm not sure if Manish's patch
included the ARM implementation of usecs_to_cycles() - it is a third
case in the #ifdef.
Performance instrumentation is also going to need mcount() and
_mcount(), which is currently a work in progress.
>
> - could you submit the drivers/net/ibm_emac/ibm_emac_core.c patch
> upstream as well?
Yes, I will do that.
>
> otherwise it looks pretty clean and straightforward.
>
> Ingo
Source: MontaVista Software, Inc.
Signed-off-by: Frank Rowand <[email protected]>
Index: linux-2.6.10/kernel/latency.c
===================================================================
--- linux-2.6.10.orig/kernel/latency.c
+++ linux-2.6.10/kernel/latency.c
@@ -192,7 +192,11 @@ static unsigned long notrace cycles_to_u
static cycles_t notrace usecs_to_cycles(unsigned long delta)
{
+#if defined CONFIG_X86
return (cycles_t) delta * (cycles_t) (cpu_khz/1000+1);
+#elif defined(CONFIG_PPC)
+ return delta * us_to_tb;
+#endif
}
#ifdef CONFIG_LATENCY_TRACE
Thanks,
-Frank (off to vacation for a couple days)
--
Frank Rowand <[email protected]>
MontaVista Software, Inc
On Thu, Feb 17, 2005 at 05:01:39AM -0800, Frank Rowand wrote:
> Ingo Molnar wrote:
> > * Frank Rowand <[email protected]> wrote:
> > - could you submit the drivers/net/ibm_emac/ibm_emac_core.c patch
> > upstream as well?
>
> Yes, I will do that.
This one is already mainline, was posted a week or so ago.
-Matt
Ingo,
this patch turns off the preemptable BKL when
either PREEMPT_VOLUNTARY or PREEMPT_NONE is selected.
Signed-off-by: Sven-Thorsten Dietrich <[email protected]>
Index: linux-2.6.10-vaio/lib/Kconfig.RT
===================================================================
--- linux-2.6.10-vaio.orig/lib/Kconfig.RT 2005-02-18 11:13:42.050554215 +0000
+++ linux-2.6.10-vaio/lib/Kconfig.RT 2005-02-18 11:20:16.021273614 +0000
@@ -144,5 +144,6 @@
config PREEMPT_BKL
bool
depends on PREEMPT_RT || !SPINLOCK_BKL
+ default n if !PREEMPT
default y
* Sven Dietrich <[email protected]> wrote:
> Ingo,
>
> this patch turns off the preemptable BKL when
> either PREEMPT_VOLUNTARY or PREEMPT_NONE is selected.
thanks, added it to my tree.
Ingo