Hi,
Following are three hibernate patches I didn't have the time to
work on before.
[1/3] - Update comments in kernel/power/hibernate.c
[2/3] - Remove arch_prepare_suspend()
[3/3] - Update kerneldoc comments in kernel/power/hibernate.c
Since they don't make any functional changes, I don't think it makes sense
to wait with them for the next merge window, so I'd like to push them
for 2.6.40 if no one objects.
Thanks,
Rafael
From: Rafael J. Wysocki <[email protected]>
Some comments in the core hibernate code are outdated, some aren't
necessary any more and at least one of them is plain wrong. Remove
those comments or update them.
Signed-off-by: Rafael J. Wysocki <[email protected]>
---
kernel/power/hibernate.c | 21 +++++++--------------
1 file changed, 7 insertions(+), 14 deletions(-)
Index: linux-2.6/kernel/power/hibernate.c
===================================================================
--- linux-2.6.orig/kernel/power/hibernate.c
+++ linux-2.6/kernel/power/hibernate.c
@@ -248,12 +248,6 @@ static int create_image(int platform_mod
if (error)
return error;
- /* At this point, dpm_suspend_start() has been called, but *not*
- * dpm_suspend_noirq(). We *must* call dpm_suspend_noirq() now.
- * Otherwise, drivers for some devices (e.g. interrupt controllers)
- * become desynchronized with the actual state of the hardware
- * at resume time, and evil weirdness ensues.
- */
error = dpm_suspend_noirq(PMSG_FREEZE);
if (error) {
printk(KERN_ERR "PM: Some devices failed to power down, "
@@ -297,9 +291,6 @@ static int create_image(int platform_mod
Power_up:
syscore_resume();
- /* NOTE: dpm_resume_noirq() is just a resume() for devices
- * that suspended with irqs off ... no overall powerup.
- */
Enable_irqs:
local_irq_enable();
@@ -416,24 +407,26 @@ static int resume_target_kernel(bool pla
if (error)
goto Enable_irqs;
- /* We'll ignore saved state, but this gets preempt count (etc) right */
save_processor_state();
error = restore_highmem();
if (!error) {
error = swsusp_arch_resume();
/*
* The code below is only ever reached in case of a failure.
- * Otherwise execution continues at place where
- * swsusp_arch_suspend() was called
+ * Otherwise, execution continues at the place where
+ * swsusp_arch_suspend() was called.
*/
BUG_ON(!error);
- /* This call to restore_highmem() undos the previous one */
+ /*
+ * This call to restore_highmem() reverts the changes made by
+ * the previous one.
+ */
restore_highmem();
}
/*
* The only reason why swsusp_arch_resume() can fail is memory being
* very tight, so we have to free it as soon as we can to avoid
- * subsequent failures
+ * subsequent failures.
*/
swsusp_free();
restore_processor_state();
From: Rafael J. Wysocki <[email protected]>
All architectures supporting hibernation define
arch_prepare_suspend() as an empty function, so remove it.
Signed-off-by: Rafael J. Wysocki <[email protected]>
---
arch/frv/include/asm/suspend.h | 20 --------------------
arch/mips/include/asm/suspend.h | 2 --
arch/powerpc/include/asm/suspend.h | 6 ------
arch/s390/include/asm/suspend.h | 10 ----------
arch/sh/include/asm/suspend.h | 1 -
arch/unicore32/include/asm/suspend.h | 1 -
arch/x86/include/asm/suspend_32.h | 2 --
arch/x86/include/asm/suspend_64.h | 5 -----
kernel/power/hibernate.c | 4 ----
9 files changed, 51 deletions(-)
Index: linux-2.6/arch/frv/include/asm/suspend.h
===================================================================
--- linux-2.6.orig/arch/frv/include/asm/suspend.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/* suspend.h: suspension stuff
- *
- * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells ([email protected])
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#ifndef _ASM_SUSPEND_H
-#define _ASM_SUSPEND_H
-
-static inline int arch_prepare_suspend(void)
-{
- return 0;
-}
-
-#endif /* _ASM_SUSPEND_H */
Index: linux-2.6/arch/s390/include/asm/suspend.h
===================================================================
--- linux-2.6.orig/arch/s390/include/asm/suspend.h
+++ /dev/null
@@ -1,10 +0,0 @@
-#ifndef __ASM_S390_SUSPEND_H
-#define __ASM_S390_SUSPEND_H
-
-static inline int arch_prepare_suspend(void)
-{
- return 0;
-}
-
-#endif
-
Index: linux-2.6/arch/sh/include/asm/suspend.h
===================================================================
--- linux-2.6.orig/arch/sh/include/asm/suspend.h
+++ linux-2.6/arch/sh/include/asm/suspend.h
@@ -3,7 +3,6 @@
#ifndef __ASSEMBLY__
#include <linux/notifier.h>
-static inline int arch_prepare_suspend(void) { return 0; }
#include <asm/ptrace.h>
Index: linux-2.6/arch/mips/include/asm/suspend.h
===================================================================
--- linux-2.6.orig/arch/mips/include/asm/suspend.h
+++ linux-2.6/arch/mips/include/asm/suspend.h
@@ -1,8 +1,6 @@
#ifndef __ASM_SUSPEND_H
#define __ASM_SUSPEND_H
-static inline int arch_prepare_suspend(void) { return 0; }
-
/* References to section boundaries */
extern const void __nosave_begin, __nosave_end;
Index: linux-2.6/arch/powerpc/include/asm/suspend.h
===================================================================
--- linux-2.6.orig/arch/powerpc/include/asm/suspend.h
+++ /dev/null
@@ -1,6 +0,0 @@
-#ifndef __ASM_POWERPC_SUSPEND_H
-#define __ASM_POWERPC_SUSPEND_H
-
-static inline int arch_prepare_suspend(void) { return 0; }
-
-#endif /* __ASM_POWERPC_SUSPEND_H */
Index: linux-2.6/arch/unicore32/include/asm/suspend.h
===================================================================
--- linux-2.6.orig/arch/unicore32/include/asm/suspend.h
+++ linux-2.6/arch/unicore32/include/asm/suspend.h
@@ -14,7 +14,6 @@
#define __UNICORE_SUSPEND_H__
#ifndef __ASSEMBLY__
-static inline int arch_prepare_suspend(void) { return 0; }
#include <asm/ptrace.h>
Index: linux-2.6/arch/x86/include/asm/suspend_32.h
===================================================================
--- linux-2.6.orig/arch/x86/include/asm/suspend_32.h
+++ linux-2.6/arch/x86/include/asm/suspend_32.h
@@ -9,8 +9,6 @@
#include <asm/desc.h>
#include <asm/i387.h>
-static inline int arch_prepare_suspend(void) { return 0; }
-
/* image of the saved processor state */
struct saved_context {
u16 es, fs, gs, ss;
Index: linux-2.6/arch/x86/include/asm/suspend_64.h
===================================================================
--- linux-2.6.orig/arch/x86/include/asm/suspend_64.h
+++ linux-2.6/arch/x86/include/asm/suspend_64.h
@@ -9,11 +9,6 @@
#include <asm/desc.h>
#include <asm/i387.h>
-static inline int arch_prepare_suspend(void)
-{
- return 0;
-}
-
/*
* Image of the saved processor state, used by the low level ACPI suspend to
* RAM code and by the low level hibernation code.
Index: linux-2.6/kernel/power/hibernate.c
===================================================================
--- linux-2.6.orig/kernel/power/hibernate.c
+++ linux-2.6/kernel/power/hibernate.c
@@ -244,10 +244,6 @@ static int create_image(int platform_mod
{
int error;
- error = arch_prepare_suspend();
- if (error)
- return error;
-
error = dpm_suspend_noirq(PMSG_FREEZE);
if (error) {
printk(KERN_ERR "PM: Some devices failed to power down, "
From: Rafael J. Wysocki <[email protected]>
Some of the kerneldoc comments in kernel/power/hibernate.c are
outdated and some of them don't adhere to the kernel's standards.
Update them and make them look in a consistent way.
Signed-off-by: Rafael J. Wysocki <[email protected]>
---
kernel/power/hibernate.c | 184 ++++++++++++++++++++++++-----------------------
1 file changed, 94 insertions(+), 90 deletions(-)
Index: linux-2.6/kernel/power/hibernate.c
===================================================================
--- linux-2.6.orig/kernel/power/hibernate.c
+++ linux-2.6/kernel/power/hibernate.c
@@ -55,10 +55,9 @@ static int hibernation_mode = HIBERNATIO
static const struct platform_hibernation_ops *hibernation_ops;
/**
- * hibernation_set_ops - set the global hibernate operations
- * @ops: the hibernation operations to use in subsequent hibernation transitions
+ * hibernation_set_ops - Set the global hibernate operations.
+ * @ops: Hibernation operations to use in subsequent hibernation transitions.
*/
-
void hibernation_set_ops(const struct platform_hibernation_ops *ops)
{
if (ops && !(ops->begin && ops->end && ops->pre_snapshot
@@ -115,10 +114,8 @@ static int hibernation_test(int level) {
#endif /* !CONFIG_PM_DEBUG */
/**
- * platform_begin - tell the platform driver that we're starting
- * hibernation
+ * platform_begin - Use platform driver to start hibernation.
*/
-
static int platform_begin(int platform_mode)
{
return (platform_mode && hibernation_ops) ?
@@ -126,10 +123,8 @@ static int platform_begin(int platform_m
}
/**
- * platform_end - tell the platform driver that we've entered the
- * working state
+ * platform_end - Use platform driver to finish transition to the working state.
*/
-
static void platform_end(int platform_mode)
{
if (platform_mode && hibernation_ops)
@@ -137,8 +132,10 @@ static void platform_end(int platform_mo
}
/**
- * platform_pre_snapshot - prepare the machine for hibernation using the
- * platform driver if so configured and return an error code if it fails
+ * platform_pre_snapshot - Call platform to prepare the machine for hibernation.
+ *
+ * Use the platform driver to prepare the system for creating a hibernate image,
+ * if so configured, and return an error code if that fails.
*/
static int platform_pre_snapshot(int platform_mode)
@@ -148,10 +145,13 @@ static int platform_pre_snapshot(int pla
}
/**
- * platform_leave - prepare the machine for switching to the normal mode
- * of operation using the platform driver (called with interrupts disabled)
+ * platform_leave - Use platform to prepare a transition to the working state.
+ *
+ * Use the platform driver prepare to prepare the machine for switching to the
+ * normal mode of operation.
+ *
+ * This routine is called on one CPU with interrupts disabled.
*/
-
static void platform_leave(int platform_mode)
{
if (platform_mode && hibernation_ops)
@@ -159,10 +159,13 @@ static void platform_leave(int platform_
}
/**
- * platform_finish - switch the machine to the normal mode of operation
- * using the platform driver (must be called after platform_prepare())
+ * platform_finish - Use platform to switch the system to the working state.
+ *
+ * Use the platform driver to switch the machine to the normal mode of
+ * operation.
+ *
+ * This routine must be called after platform_prepare().
*/
-
static void platform_finish(int platform_mode)
{
if (platform_mode && hibernation_ops)
@@ -170,11 +173,14 @@ static void platform_finish(int platform
}
/**
- * platform_pre_restore - prepare the platform for the restoration from a
- * hibernation image. If the restore fails after this function has been
- * called, platform_restore_cleanup() must be called.
+ * platform_pre_restore - Prepare for hibernate image restoration.
+ *
+ * Use the platform driver to prepare the system for resume from a hibernation
+ * image.
+ *
+ * If the restore fails after this function has been called,
+ * platform_restore_cleanup() must be called.
*/
-
static int platform_pre_restore(int platform_mode)
{
return (platform_mode && hibernation_ops) ?
@@ -182,12 +188,15 @@ static int platform_pre_restore(int plat
}
/**
- * platform_restore_cleanup - switch the platform to the normal mode of
- * operation after a failing restore. If platform_pre_restore() has been
- * called before the failing restore, this function must be called too,
- * regardless of the result of platform_pre_restore().
+ * platform_restore_cleanup - Switch to the working state after failing restore.
+ *
+ * Use the platform driver to switch the system to the normal mode of operation
+ * after a failing restore.
+ *
+ * If platform_pre_restore() has been called before the failing restore, this
+ * function must be called too, regardless of the result of
+ * platform_pre_restore().
*/
-
static void platform_restore_cleanup(int platform_mode)
{
if (platform_mode && hibernation_ops)
@@ -195,10 +204,8 @@ static void platform_restore_cleanup(int
}
/**
- * platform_recover - recover the platform from a failure to suspend
- * devices.
+ * platform_recover - Recover the platform from a failure to suspend devices.
*/
-
static void platform_recover(int platform_mode)
{
if (platform_mode && hibernation_ops && hibernation_ops->recover)
@@ -206,13 +213,12 @@ static void platform_recover(int platfor
}
/**
- * swsusp_show_speed - print the time elapsed between two events.
- * @start: Starting event.
- * @stop: Final event.
- * @nr_pages - number of pages processed between @start and @stop
- * @msg - introductory message to print
+ * swsusp_show_speed - Print time elapsed between two events during hibernation.
+ * @start: Starting event.
+ * @stop: Final event.
+ * @nr_pages: Number of memory pages processed between @start and @stop.
+ * @msg: Additional diagnostic message to print.
*/
-
void swsusp_show_speed(struct timeval *start, struct timeval *stop,
unsigned nr_pages, char *msg)
{
@@ -235,11 +241,13 @@ void swsusp_show_speed(struct timeval *s
}
/**
- * create_image - freeze devices that need to be frozen with interrupts
- * off, create the hibernation image and thaw those devices. Control
- * reappears in this routine after a restore.
+ * create_image - Create a hibernation image.
+ *
+ * Execute device drivers' .freeze_noirq() callbacks, create a hibernation image
+ * and execute the drivers' .thaw_noirq() callbacks.
+ *
+ * Control reappears in this routine after the subsequent restore.
*/
-
static int create_image(int platform_mode)
{
int error;
@@ -304,14 +312,11 @@ static int create_image(int platform_mod
}
/**
- * hibernation_snapshot - quiesce devices and create the hibernation
- * snapshot image.
- * @platform_mode - if set, use the platform driver, if available, to
- * prepare the platform firmware for the power transition.
+ * hibernation_snapshot - Quiesce devices and create a hibernation image.
+ * @platform_mode: If set, use platform driver to prepare for the transition.
*
- * Must be called with pm_mutex held
+ * This routine must be called with pm_mutex held.
*/
-
int hibernation_snapshot(int platform_mode)
{
pm_message_t msg = PMSG_RECOVER;
@@ -371,13 +376,13 @@ int hibernation_snapshot(int platform_mo
}
/**
- * resume_target_kernel - prepare devices that need to be suspended with
- * interrupts off, restore the contents of highmem that have not been
- * restored yet from the image and run the low level code that will restore
- * the remaining contents of memory and switch to the just restored target
- * kernel.
+ * resume_target_kernel - Restore system state from a hibernation image.
+ *
+ * Execute device drivers' .freeze_noirq() callbacks, restore the contents of
+ * highmem that have not been restored yet from the image and run the low-level
+ * code that will restore the remaining contents of memory and switch to the
+ * just restored target kernel.
*/
-
static int resume_target_kernel(bool platform_mode)
{
int error;
@@ -445,14 +450,12 @@ static int resume_target_kernel(bool pla
}
/**
- * hibernation_restore - quiesce devices and restore the hibernation
- * snapshot image. If successful, control returns in hibernation_snaphot()
- * @platform_mode - if set, use the platform driver, if available, to
- * prepare the platform firmware for the transition.
+ * hibernation_restore - Quiesce devices and restore from a hibernation image.
+ * @platform_mode: If set, use platform driver to prepare for the transition.
*
- * Must be called with pm_mutex held
+ * This routine must be called with pm_mutex held. If it is successful, control
+ * reappears in the restored target kernel in hibernation_snaphot().
*/
-
int hibernation_restore(int platform_mode)
{
int error;
@@ -472,10 +475,8 @@ int hibernation_restore(int platform_mod
}
/**
- * hibernation_platform_enter - enter the hibernation state using the
- * platform driver (if available)
+ * hibernation_platform_enter - Power off the system using the platform driver.
*/
-
int hibernation_platform_enter(void)
{
int error;
@@ -546,12 +547,12 @@ int hibernation_platform_enter(void)
}
/**
- * power_down - Shut the machine down for hibernation.
+ * power_down - Shut the machine down for hibernation.
*
- * Use the platform driver, if configured so; otherwise try
- * to power off or reboot.
+ * Use the platform driver, if configured, to put the system into the sleep
+ * state corresponding to hibernation, or try to power it off or reboot,
+ * depending on the value of hibernation_mode.
*/
-
static void power_down(void)
{
switch (hibernation_mode) {
@@ -588,9 +589,8 @@ static int prepare_processes(void)
}
/**
- * hibernate - The granpappy of the built-in hibernation management
+ * hibernate - Carry out system hibernation, including saving the image.
*/
-
int hibernate(void)
{
int error;
@@ -668,17 +668,20 @@ int hibernate(void)
/**
- * software_resume - Resume from a saved image.
+ * software_resume - Resume from a saved hibernation image.
+ *
+ * This routine is called as a late initcall, when all devices have been
+ * discovered and initialized already.
*
- * Called as a late_initcall (so all devices are discovered and
- * initialized), we call swsusp to see if we have a saved image or not.
- * If so, we quiesce devices, the restore the saved image. We will
- * return above (in hibernate() ) if everything goes well.
- * Otherwise, we fail gracefully and return to the normally
- * scheduled program.
+ * The image reading code is called to see if there is a hibernation image
+ * available for reading. If that is the case, devices are quiesced and the
+ * contents of memory is restored from the saved image.
*
+ * If this is successful, control reappears in the restored target kernel in
+ * hibernation_snaphot() which returns to hibernate(). Otherwise, the routine
+ * attempts to recover gracefully and make the kernel return to the normal mode
+ * of operation.
*/
-
static int software_resume(void)
{
int error;
@@ -808,21 +811,17 @@ static const char * const hibernation_mo
[HIBERNATION_TESTPROC] = "testproc",
};
-/**
- * disk - Control hibernation mode
+/*
+ * /sys/power/disk - Control hibernation mode.
*
- * Suspend-to-disk can be handled in several ways. We have a few options
- * for putting the system to sleep - using the platform driver (e.g. ACPI
- * or other hibernation_ops), powering off the system or rebooting the
- * system (for testing) as well as the two test modes.
- *
- * The system can support 'platform', and that is known a priori (and
- * encoded by the presence of hibernation_ops). However, the user may
- * choose 'shutdown' or 'reboot' as alternatives, as well as one fo the
- * test modes, 'test' or 'testproc'.
+ * Hibernation can be handled in several ways. There are a few different ways
+ * to put the system into the sleep state: using the platform driver (e.g. ACPI
+ * or other hibernation_ops), powering it off or rebooting it (for testing
+ * mostly), or using one of the two available test modes.
*
- * show() will display what the mode is currently set to.
- * store() will accept one of
+ * The sysfs file /sys/power/disk provides an interface for selecting the
+ * hibernation mode to use. Reading from this file causes the available modes
+ * to be printed. There are 5 modes that can be supported:
*
* 'platform'
* 'shutdown'
@@ -830,8 +829,14 @@ static const char * const hibernation_mo
* 'test'
* 'testproc'
*
- * It will only change to 'platform' if the system
- * supports it (as determined by having hibernation_ops).
+ * If a platform hibernation driver is in use, 'platform' will be supported
+ * and will be used by default. Otherwise, 'shutdown' will be used by default.
+ * The selected option (i.e. the one corresponding to the current value of
+ * hibernation_mode) is enclosed by a square bracket.
+ *
+ * To select a given hibernation mode it is necessary to write the mode's
+ * string representation (as returned by reading from /sys/power/disk) back
+ * into /sys/power/disk.
*/
static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
@@ -864,7 +869,6 @@ static ssize_t disk_show(struct kobject
return buf-start;
}
-
static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t n)
{
On 05/21/11 05:12, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <[email protected]>
>
> Some of the kerneldoc comments in kernel/power/hibernate.c are
> outdated and some of them don't adhere to the kernel's standards.
> Update them and make them look in a consistent way.
Hi Rafael,
Several of the functions are missing function parameter notations, as
noted below.
> Signed-off-by: Rafael J. Wysocki <[email protected]>
> ---
> kernel/power/hibernate.c | 184 ++++++++++++++++++++++++-----------------------
> 1 file changed, 94 insertions(+), 90 deletions(-)
>
> Index: linux-2.6/kernel/power/hibernate.c
> ===================================================================
> --- linux-2.6.orig/kernel/power/hibernate.c
> +++ linux-2.6/kernel/power/hibernate.c
> @@ -55,10 +55,9 @@ static int hibernation_mode = HIBERNATIO
> static const struct platform_hibernation_ops *hibernation_ops;
>
> /**
> - * hibernation_set_ops - set the global hibernate operations
> - * @ops: the hibernation operations to use in subsequent hibernation transitions
> + * hibernation_set_ops - Set the global hibernate operations.
> + * @ops: Hibernation operations to use in subsequent hibernation transitions.
> */
> -
> void hibernation_set_ops(const struct platform_hibernation_ops *ops)
> {
> if (ops && !(ops->begin && ops->end && ops->pre_snapshot
> @@ -115,10 +114,8 @@ static int hibernation_test(int level) {
> #endif /* !CONFIG_PM_DEBUG */
>
> /**
> - * platform_begin - tell the platform driver that we're starting
> - * hibernation
> + * platform_begin - Use platform driver to start hibernation.
* @platform_mode: <description>
> */
> -
> static int platform_begin(int platform_mode)
> {
> return (platform_mode && hibernation_ops) ?
> @@ -126,10 +123,8 @@ static int platform_begin(int platform_m
> }
>
> /**
> - * platform_end - tell the platform driver that we've entered the
> - * working state
> + * platform_end - Use platform driver to finish transition to the working state.
* @platform_mode: <description>
> */
> -
> static void platform_end(int platform_mode)
> {
> if (platform_mode && hibernation_ops)
> @@ -137,8 +132,10 @@ static void platform_end(int platform_mo
> }
>
> /**
> - * platform_pre_snapshot - prepare the machine for hibernation using the
> - * platform driver if so configured and return an error code if it fails
> + * platform_pre_snapshot - Call platform to prepare the machine for hibernation.
* @platform_mode: <description>
> + *
> + * Use the platform driver to prepare the system for creating a hibernate image,
> + * if so configured, and return an error code if that fails.
> */
>
> static int platform_pre_snapshot(int platform_mode)
> @@ -148,10 +145,13 @@ static int platform_pre_snapshot(int pla
> }
>
> /**
> - * platform_leave - prepare the machine for switching to the normal mode
> - * of operation using the platform driver (called with interrupts disabled)
> + * platform_leave - Use platform to prepare a transition to the working state.
* @platform_mode: <description>
> + *
> + * Use the platform driver prepare to prepare the machine for switching to the
> + * normal mode of operation.
> + *
> + * This routine is called on one CPU with interrupts disabled.
> */
> -
> static void platform_leave(int platform_mode)
> {
> if (platform_mode && hibernation_ops)
> @@ -159,10 +159,13 @@ static void platform_leave(int platform_
> }
>
> /**
> - * platform_finish - switch the machine to the normal mode of operation
> - * using the platform driver (must be called after platform_prepare())
> + * platform_finish - Use platform to switch the system to the working state.
* @platform_mode: <description>
> + *
> + * Use the platform driver to switch the machine to the normal mode of
> + * operation.
> + *
> + * This routine must be called after platform_prepare().
> */
> -
> static void platform_finish(int platform_mode)
> {
> if (platform_mode && hibernation_ops)
> @@ -170,11 +173,14 @@ static void platform_finish(int platform
> }
>
> /**
> - * platform_pre_restore - prepare the platform for the restoration from a
> - * hibernation image. If the restore fails after this function has been
> - * called, platform_restore_cleanup() must be called.
> + * platform_pre_restore - Prepare for hibernate image restoration.
* @platform_mode: <description>
> + *
> + * Use the platform driver to prepare the system for resume from a hibernation
> + * image.
> + *
> + * If the restore fails after this function has been called,
> + * platform_restore_cleanup() must be called.
> */
> -
> static int platform_pre_restore(int platform_mode)
> {
> return (platform_mode && hibernation_ops) ?
> @@ -182,12 +188,15 @@ static int platform_pre_restore(int plat
> }
>
> /**
> - * platform_restore_cleanup - switch the platform to the normal mode of
> - * operation after a failing restore. If platform_pre_restore() has been
> - * called before the failing restore, this function must be called too,
> - * regardless of the result of platform_pre_restore().
> + * platform_restore_cleanup - Switch to the working state after failing restore.
* @platform_mode: <description>
> + *
> + * Use the platform driver to switch the system to the normal mode of operation
> + * after a failing restore.
> + *
> + * If platform_pre_restore() has been called before the failing restore, this
> + * function must be called too, regardless of the result of
> + * platform_pre_restore().
> */
> -
> static void platform_restore_cleanup(int platform_mode)
> {
> if (platform_mode && hibernation_ops)
> @@ -195,10 +204,8 @@ static void platform_restore_cleanup(int
> }
>
> /**
> - * platform_recover - recover the platform from a failure to suspend
> - * devices.
> + * platform_recover - Recover the platform from a failure to suspend devices.
* @platform_mode: <description>
> */
> -
> static void platform_recover(int platform_mode)
> {
> if (platform_mode && hibernation_ops && hibernation_ops->recover)
> @@ -206,13 +213,12 @@ static void platform_recover(int platfor
> }
>
> /**
> - * swsusp_show_speed - print the time elapsed between two events.
> - * @start: Starting event.
> - * @stop: Final event.
> - * @nr_pages - number of pages processed between @start and @stop
> - * @msg - introductory message to print
> + * swsusp_show_speed - Print time elapsed between two events during hibernation.
> + * @start: Starting event.
> + * @stop: Final event.
> + * @nr_pages: Number of memory pages processed between @start and @stop.
> + * @msg: Additional diagnostic message to print.
> */
> -
> void swsusp_show_speed(struct timeval *start, struct timeval *stop,
> unsigned nr_pages, char *msg)
> {
> @@ -235,11 +241,13 @@ void swsusp_show_speed(struct timeval *s
> }
>
> /**
> - * create_image - freeze devices that need to be frozen with interrupts
> - * off, create the hibernation image and thaw those devices. Control
> - * reappears in this routine after a restore.
> + * create_image - Create a hibernation image.
* @platform_mode: <description>
> + *
> + * Execute device drivers' .freeze_noirq() callbacks, create a hibernation image
> + * and execute the drivers' .thaw_noirq() callbacks.
> + *
> + * Control reappears in this routine after the subsequent restore.
> */
> -
> static int create_image(int platform_mode)
> {
> int error;
> @@ -304,14 +312,11 @@ static int create_image(int platform_mod
> }
>
> /**
> - * hibernation_snapshot - quiesce devices and create the hibernation
> - * snapshot image.
> - * @platform_mode - if set, use the platform driver, if available, to
> - * prepare the platform firmware for the power transition.
> + * hibernation_snapshot - Quiesce devices and create a hibernation image.
> + * @platform_mode: If set, use platform driver to prepare for the transition.
> *
> - * Must be called with pm_mutex held
> + * This routine must be called with pm_mutex held.
> */
> -
> int hibernation_snapshot(int platform_mode)
> {
> pm_message_t msg = PMSG_RECOVER;
> @@ -371,13 +376,13 @@ int hibernation_snapshot(int platform_mo
> }
>
> /**
> - * resume_target_kernel - prepare devices that need to be suspended with
> - * interrupts off, restore the contents of highmem that have not been
> - * restored yet from the image and run the low level code that will restore
> - * the remaining contents of memory and switch to the just restored target
> - * kernel.
> + * resume_target_kernel - Restore system state from a hibernation image.
* @platform_mode: <description>
> + *
> + * Execute device drivers' .freeze_noirq() callbacks, restore the contents of
> + * highmem that have not been restored yet from the image and run the low-level
> + * code that will restore the remaining contents of memory and switch to the
> + * just restored target kernel.
> */
> -
> static int resume_target_kernel(bool platform_mode)
> {
> int error;
> @@ -445,14 +450,12 @@ static int resume_target_kernel(bool pla
> }
>
> /**
> - * hibernation_restore - quiesce devices and restore the hibernation
> - * snapshot image. If successful, control returns in hibernation_snaphot()
> - * @platform_mode - if set, use the platform driver, if available, to
> - * prepare the platform firmware for the transition.
> + * hibernation_restore - Quiesce devices and restore from a hibernation image.
> + * @platform_mode: If set, use platform driver to prepare for the transition.
> *
> - * Must be called with pm_mutex held
> + * This routine must be called with pm_mutex held. If it is successful, control
> + * reappears in the restored target kernel in hibernation_snaphot().
> */
> -
> int hibernation_restore(int platform_mode)
> {
> int error;
> @@ -472,10 +475,8 @@ int hibernation_restore(int platform_mod
> }
>
> /**
> - * hibernation_platform_enter - enter the hibernation state using the
> - * platform driver (if available)
> + * hibernation_platform_enter - Power off the system using the platform driver.
> */
> -
> int hibernation_platform_enter(void)
> {
> int error;
> @@ -546,12 +547,12 @@ int hibernation_platform_enter(void)
> }
>
> /**
> - * power_down - Shut the machine down for hibernation.
> + * power_down - Shut the machine down for hibernation.
> *
> - * Use the platform driver, if configured so; otherwise try
> - * to power off or reboot.
> + * Use the platform driver, if configured, to put the system into the sleep
> + * state corresponding to hibernation, or try to power it off or reboot,
> + * depending on the value of hibernation_mode.
> */
> -
> static void power_down(void)
> {
> switch (hibernation_mode) {
> @@ -588,9 +589,8 @@ static int prepare_processes(void)
> }
>
> /**
> - * hibernate - The granpappy of the built-in hibernation management
> + * hibernate - Carry out system hibernation, including saving the image.
> */
> -
> int hibernate(void)
> {
> int error;
> @@ -668,17 +668,20 @@ int hibernate(void)
>
>
> /**
> - * software_resume - Resume from a saved image.
> + * software_resume - Resume from a saved hibernation image.
> + *
> + * This routine is called as a late initcall, when all devices have been
> + * discovered and initialized already.
> *
> - * Called as a late_initcall (so all devices are discovered and
> - * initialized), we call swsusp to see if we have a saved image or not.
> - * If so, we quiesce devices, the restore the saved image. We will
> - * return above (in hibernate() ) if everything goes well.
> - * Otherwise, we fail gracefully and return to the normally
> - * scheduled program.
> + * The image reading code is called to see if there is a hibernation image
> + * available for reading. If that is the case, devices are quiesced and the
> + * contents of memory is restored from the saved image.
> *
> + * If this is successful, control reappears in the restored target kernel in
> + * hibernation_snaphot() which returns to hibernate(). Otherwise, the routine
> + * attempts to recover gracefully and make the kernel return to the normal mode
> + * of operation.
> */
> -
> static int software_resume(void)
> {
> int error;
> @@ -808,21 +811,17 @@ static const char * const hibernation_mo
> [HIBERNATION_TESTPROC] = "testproc",
> };
>
> -/**
> - * disk - Control hibernation mode
> +/*
> + * /sys/power/disk - Control hibernation mode.
> *
> - * Suspend-to-disk can be handled in several ways. We have a few options
> - * for putting the system to sleep - using the platform driver (e.g. ACPI
> - * or other hibernation_ops), powering off the system or rebooting the
> - * system (for testing) as well as the two test modes.
> - *
> - * The system can support 'platform', and that is known a priori (and
> - * encoded by the presence of hibernation_ops). However, the user may
> - * choose 'shutdown' or 'reboot' as alternatives, as well as one fo the
> - * test modes, 'test' or 'testproc'.
> + * Hibernation can be handled in several ways. There are a few different ways
> + * to put the system into the sleep state: using the platform driver (e.g. ACPI
> + * or other hibernation_ops), powering it off or rebooting it (for testing
> + * mostly), or using one of the two available test modes.
> *
> - * show() will display what the mode is currently set to.
> - * store() will accept one of
> + * The sysfs file /sys/power/disk provides an interface for selecting the
> + * hibernation mode to use. Reading from this file causes the available modes
> + * to be printed. There are 5 modes that can be supported:
> *
> * 'platform'
> * 'shutdown'
> @@ -830,8 +829,14 @@ static const char * const hibernation_mo
> * 'test'
> * 'testproc'
> *
> - * It will only change to 'platform' if the system
> - * supports it (as determined by having hibernation_ops).
> + * If a platform hibernation driver is in use, 'platform' will be supported
> + * and will be used by default. Otherwise, 'shutdown' will be used by default.
> + * The selected option (i.e. the one corresponding to the current value of
> + * hibernation_mode) is enclosed by a square bracket.
> + *
> + * To select a given hibernation mode it is necessary to write the mode's
> + * string representation (as returned by reading from /sys/power/disk) back
> + * into /sys/power/disk.
> */
>
> static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
> @@ -864,7 +869,6 @@ static ssize_t disk_show(struct kobject
> return buf-start;
> }
>
> -
> static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
> const char *buf, size_t n)
> {
>
Thanks.
--
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
On Monday, May 23, 2011, Randy Dunlap wrote:
> On 05/21/11 05:12, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <[email protected]>
> >
> > Some of the kerneldoc comments in kernel/power/hibernate.c are
> > outdated and some of them don't adhere to the kernel's standards.
> > Update them and make them look in a consistent way.
>
> Hi Rafael,
Hi,
> Several of the functions are missing function parameter notations, as
> noted below.
Ah, thanks! Those should be fixed in the new version of the patch below.
Thanks,
Rafael
---
From: Rafael J. Wysocki <[email protected]>
Subject: PM / Hibernate: Update kerneldoc comments in hibernate.c
Some of the kerneldoc comments in kernel/power/hibernate.c are
outdated and some of them don't adhere to the kernel's standards.
Update them and make them look in a consistent way.
Signed-off-by: Rafael J. Wysocki <[email protected]>
---
kernel/power/hibernate.c | 194 +++++++++++++++++++++++++----------------------
1 file changed, 104 insertions(+), 90 deletions(-)
Index: linux-2.6/kernel/power/hibernate.c
===================================================================
--- linux-2.6.orig/kernel/power/hibernate.c
+++ linux-2.6/kernel/power/hibernate.c
@@ -55,10 +55,9 @@ static int hibernation_mode = HIBERNATIO
static const struct platform_hibernation_ops *hibernation_ops;
/**
- * hibernation_set_ops - set the global hibernate operations
- * @ops: the hibernation operations to use in subsequent hibernation transitions
+ * hibernation_set_ops - Set the global hibernate operations.
+ * @ops: Hibernation operations to use in subsequent hibernation transitions.
*/
-
void hibernation_set_ops(const struct platform_hibernation_ops *ops)
{
if (ops && !(ops->begin && ops->end && ops->pre_snapshot
@@ -115,10 +114,9 @@ static int hibernation_test(int level) {
#endif /* !CONFIG_PM_DEBUG */
/**
- * platform_begin - tell the platform driver that we're starting
- * hibernation
+ * platform_begin - Call platform to start hibernation.
+ * @platform_mode: Whether or not to use the platform driver.
*/
-
static int platform_begin(int platform_mode)
{
return (platform_mode && hibernation_ops) ?
@@ -126,10 +124,9 @@ static int platform_begin(int platform_m
}
/**
- * platform_end - tell the platform driver that we've entered the
- * working state
+ * platform_end - Call platform to finish transition to the working state.
+ * @platform_mode: Whether or not to use the platform driver.
*/
-
static void platform_end(int platform_mode)
{
if (platform_mode && hibernation_ops)
@@ -137,8 +134,11 @@ static void platform_end(int platform_mo
}
/**
- * platform_pre_snapshot - prepare the machine for hibernation using the
- * platform driver if so configured and return an error code if it fails
+ * platform_pre_snapshot - Call platform to prepare the machine for hibernation.
+ * @platform_mode: Whether or not to use the platform driver.
+ *
+ * Use the platform driver to prepare the system for creating a hibernate image,
+ * if so configured, and return an error code if that fails.
*/
static int platform_pre_snapshot(int platform_mode)
@@ -148,10 +148,14 @@ static int platform_pre_snapshot(int pla
}
/**
- * platform_leave - prepare the machine for switching to the normal mode
- * of operation using the platform driver (called with interrupts disabled)
+ * platform_leave - Call platform to prepare a transition to the working state.
+ * @platform_mode: Whether or not to use the platform driver.
+ *
+ * Use the platform driver prepare to prepare the machine for switching to the
+ * normal mode of operation.
+ *
+ * This routine is called on one CPU with interrupts disabled.
*/
-
static void platform_leave(int platform_mode)
{
if (platform_mode && hibernation_ops)
@@ -159,10 +163,14 @@ static void platform_leave(int platform_
}
/**
- * platform_finish - switch the machine to the normal mode of operation
- * using the platform driver (must be called after platform_prepare())
+ * platform_finish - Call platform to switch the system to the working state.
+ * @platform_mode: Whether or not to use the platform driver.
+ *
+ * Use the platform driver to switch the machine to the normal mode of
+ * operation.
+ *
+ * This routine must be called after platform_prepare().
*/
-
static void platform_finish(int platform_mode)
{
if (platform_mode && hibernation_ops)
@@ -170,11 +178,15 @@ static void platform_finish(int platform
}
/**
- * platform_pre_restore - prepare the platform for the restoration from a
- * hibernation image. If the restore fails after this function has been
- * called, platform_restore_cleanup() must be called.
+ * platform_pre_restore - Prepare for hibernate image restoration.
+ * @platform_mode: Whether or not to use the platform driver.
+ *
+ * Use the platform driver to prepare the system for resume from a hibernation
+ * image.
+ *
+ * If the restore fails after this function has been called,
+ * platform_restore_cleanup() must be called.
*/
-
static int platform_pre_restore(int platform_mode)
{
return (platform_mode && hibernation_ops) ?
@@ -182,12 +194,16 @@ static int platform_pre_restore(int plat
}
/**
- * platform_restore_cleanup - switch the platform to the normal mode of
- * operation after a failing restore. If platform_pre_restore() has been
- * called before the failing restore, this function must be called too,
- * regardless of the result of platform_pre_restore().
+ * platform_restore_cleanup - Switch to the working state after failing restore.
+ * @platform_mode: Whether or not to use the platform driver.
+ *
+ * Use the platform driver to switch the system to the normal mode of operation
+ * after a failing restore.
+ *
+ * If platform_pre_restore() has been called before the failing restore, this
+ * function must be called too, regardless of the result of
+ * platform_pre_restore().
*/
-
static void platform_restore_cleanup(int platform_mode)
{
if (platform_mode && hibernation_ops)
@@ -195,10 +211,9 @@ static void platform_restore_cleanup(int
}
/**
- * platform_recover - recover the platform from a failure to suspend
- * devices.
+ * platform_recover - Recover from a failure to suspend devices.
+ * @platform_mode: Whether or not to use the platform driver.
*/
-
static void platform_recover(int platform_mode)
{
if (platform_mode && hibernation_ops && hibernation_ops->recover)
@@ -206,13 +221,12 @@ static void platform_recover(int platfor
}
/**
- * swsusp_show_speed - print the time elapsed between two events.
- * @start: Starting event.
- * @stop: Final event.
- * @nr_pages - number of pages processed between @start and @stop
- * @msg - introductory message to print
+ * swsusp_show_speed - Print time elapsed between two events during hibernation.
+ * @start: Starting event.
+ * @stop: Final event.
+ * @nr_pages: Number of memory pages processed between @start and @stop.
+ * @msg: Additional diagnostic message to print.
*/
-
void swsusp_show_speed(struct timeval *start, struct timeval *stop,
unsigned nr_pages, char *msg)
{
@@ -235,11 +249,14 @@ void swsusp_show_speed(struct timeval *s
}
/**
- * create_image - freeze devices that need to be frozen with interrupts
- * off, create the hibernation image and thaw those devices. Control
- * reappears in this routine after a restore.
+ * create_image - Create a hibernation image.
+ * @platform_mode: Whether or not to use the platform driver.
+ *
+ * Execute device drivers' .freeze_noirq() callbacks, create a hibernation image
+ * and execute the drivers' .thaw_noirq() callbacks.
+ *
+ * Control reappears in this routine after the subsequent restore.
*/
-
static int create_image(int platform_mode)
{
int error;
@@ -304,14 +321,11 @@ static int create_image(int platform_mod
}
/**
- * hibernation_snapshot - quiesce devices and create the hibernation
- * snapshot image.
- * @platform_mode - if set, use the platform driver, if available, to
- * prepare the platform firmware for the power transition.
+ * hibernation_snapshot - Quiesce devices and create a hibernation image.
+ * @platform_mode: If set, use platform driver to prepare for the transition.
*
- * Must be called with pm_mutex held
+ * This routine must be called with pm_mutex held.
*/
-
int hibernation_snapshot(int platform_mode)
{
pm_message_t msg = PMSG_RECOVER;
@@ -371,13 +385,14 @@ int hibernation_snapshot(int platform_mo
}
/**
- * resume_target_kernel - prepare devices that need to be suspended with
- * interrupts off, restore the contents of highmem that have not been
- * restored yet from the image and run the low level code that will restore
- * the remaining contents of memory and switch to the just restored target
- * kernel.
+ * resume_target_kernel - Restore system state from a hibernation image.
+ * @platform_mode: Whether or not to use the platform driver.
+ *
+ * Execute device drivers' .freeze_noirq() callbacks, restore the contents of
+ * highmem that have not been restored yet from the image and run the low-level
+ * code that will restore the remaining contents of memory and switch to the
+ * just restored target kernel.
*/
-
static int resume_target_kernel(bool platform_mode)
{
int error;
@@ -445,14 +460,12 @@ static int resume_target_kernel(bool pla
}
/**
- * hibernation_restore - quiesce devices and restore the hibernation
- * snapshot image. If successful, control returns in hibernation_snaphot()
- * @platform_mode - if set, use the platform driver, if available, to
- * prepare the platform firmware for the transition.
+ * hibernation_restore - Quiesce devices and restore from a hibernation image.
+ * @platform_mode: If set, use platform driver to prepare for the transition.
*
- * Must be called with pm_mutex held
+ * This routine must be called with pm_mutex held. If it is successful, control
+ * reappears in the restored target kernel in hibernation_snaphot().
*/
-
int hibernation_restore(int platform_mode)
{
int error;
@@ -472,10 +485,8 @@ int hibernation_restore(int platform_mod
}
/**
- * hibernation_platform_enter - enter the hibernation state using the
- * platform driver (if available)
+ * hibernation_platform_enter - Power off the system using the platform driver.
*/
-
int hibernation_platform_enter(void)
{
int error;
@@ -546,12 +557,12 @@ int hibernation_platform_enter(void)
}
/**
- * power_down - Shut the machine down for hibernation.
+ * power_down - Shut the machine down for hibernation.
*
- * Use the platform driver, if configured so; otherwise try
- * to power off or reboot.
+ * Use the platform driver, if configured, to put the system into the sleep
+ * state corresponding to hibernation, or try to power it off or reboot,
+ * depending on the value of hibernation_mode.
*/
-
static void power_down(void)
{
switch (hibernation_mode) {
@@ -588,9 +599,8 @@ static int prepare_processes(void)
}
/**
- * hibernate - The granpappy of the built-in hibernation management
+ * hibernate - Carry out system hibernation, including saving the image.
*/
-
int hibernate(void)
{
int error;
@@ -668,17 +678,20 @@ int hibernate(void)
/**
- * software_resume - Resume from a saved image.
+ * software_resume - Resume from a saved hibernation image.
+ *
+ * This routine is called as a late initcall, when all devices have been
+ * discovered and initialized already.
*
- * Called as a late_initcall (so all devices are discovered and
- * initialized), we call swsusp to see if we have a saved image or not.
- * If so, we quiesce devices, the restore the saved image. We will
- * return above (in hibernate() ) if everything goes well.
- * Otherwise, we fail gracefully and return to the normally
- * scheduled program.
+ * The image reading code is called to see if there is a hibernation image
+ * available for reading. If that is the case, devices are quiesced and the
+ * contents of memory is restored from the saved image.
*
+ * If this is successful, control reappears in the restored target kernel in
+ * hibernation_snaphot() which returns to hibernate(). Otherwise, the routine
+ * attempts to recover gracefully and make the kernel return to the normal mode
+ * of operation.
*/
-
static int software_resume(void)
{
int error;
@@ -808,21 +821,17 @@ static const char * const hibernation_mo
[HIBERNATION_TESTPROC] = "testproc",
};
-/**
- * disk - Control hibernation mode
+/*
+ * /sys/power/disk - Control hibernation mode.
*
- * Suspend-to-disk can be handled in several ways. We have a few options
- * for putting the system to sleep - using the platform driver (e.g. ACPI
- * or other hibernation_ops), powering off the system or rebooting the
- * system (for testing) as well as the two test modes.
- *
- * The system can support 'platform', and that is known a priori (and
- * encoded by the presence of hibernation_ops). However, the user may
- * choose 'shutdown' or 'reboot' as alternatives, as well as one fo the
- * test modes, 'test' or 'testproc'.
+ * Hibernation can be handled in several ways. There are a few different ways
+ * to put the system into the sleep state: using the platform driver (e.g. ACPI
+ * or other hibernation_ops), powering it off or rebooting it (for testing
+ * mostly), or using one of the two available test modes.
*
- * show() will display what the mode is currently set to.
- * store() will accept one of
+ * The sysfs file /sys/power/disk provides an interface for selecting the
+ * hibernation mode to use. Reading from this file causes the available modes
+ * to be printed. There are 5 modes that can be supported:
*
* 'platform'
* 'shutdown'
@@ -830,8 +839,14 @@ static const char * const hibernation_mo
* 'test'
* 'testproc'
*
- * It will only change to 'platform' if the system
- * supports it (as determined by having hibernation_ops).
+ * If a platform hibernation driver is in use, 'platform' will be supported
+ * and will be used by default. Otherwise, 'shutdown' will be used by default.
+ * The selected option (i.e. the one corresponding to the current value of
+ * hibernation_mode) is enclosed by a square bracket.
+ *
+ * To select a given hibernation mode it is necessary to write the mode's
+ * string representation (as returned by reading from /sys/power/disk) back
+ * into /sys/power/disk.
*/
static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
@@ -864,7 +879,6 @@ static ssize_t disk_show(struct kobject
return buf-start;
}
-
static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t n)
{
On Mon, 23 May 2011 23:11:28 +0200 Rafael J. Wysocki wrote:
> ---
> From: Rafael J. Wysocki <[email protected]>
> Subject: PM / Hibernate: Update kerneldoc comments in hibernate.c
>
> Some of the kerneldoc comments in kernel/power/hibernate.c are
> outdated and some of them don't adhere to the kernel's standards.
> Update them and make them look in a consistent way.
>
> Signed-off-by: Rafael J. Wysocki <[email protected]>
Looks good. Thanks.
Acked-by: Randy Dunlap <[email protected]>
---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
On Sat, 21 May 2011, Rafael J. Wysocki wrote:
> Hi,
>
> Following are three hibernate patches I didn't have the time to
> work on before.
>
> [1/3] - Update comments in kernel/power/hibernate.c
> [2/3] - Remove arch_prepare_suspend()
> [3/3] - Update kerneldoc comments in kernel/power/hibernate.c
>
> Since they don't make any functional changes, I don't think it makes sense
> to wait with them for the next merge window, so I'd like to push them
> for 2.6.40 if no one objects.
>
> Thanks,
> Rafael
>
>
Hi Rafael,
thanks, these are helpful !
FrankH.
On Sat 2011-05-21 14:10:34, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <[email protected]>
>
> All architectures supporting hibernation define
> arch_prepare_suspend() as an empty function, so remove it.
>
> Signed-off-by: Rafael J. Wysocki <[email protected]>
ACK.
--
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On Sat, May 21, 2011 at 02:10:34PM +0200, Rafael J. Wysocki wrote:
>
> All architectures supporting hibernation define
> arch_prepare_suspend() as an empty function, so remove it.
>
> Signed-off-by: Rafael J. Wysocki <[email protected]>
> ---
> arch/frv/include/asm/suspend.h | 20 --------------------
> arch/mips/include/asm/suspend.h | 2 --
I don't see what we'd possibly need that hook for so:
Acked-by: Ralf Baechle <[email protected]>
Ralf