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PM / sleep: Refactor filesystems sync to reduce duplication

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Create a common helper to sync filesystems for system suspend and
hibernation.

Signed-off-by: Harry Pan <harry.pan@intel.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
[ rjw: Changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Harry Pan 2019-02-25 20:36:41 +08:00 committed by Rafael J. Wysocki
parent 74a1dd86d1
commit b5dee3130b
5 changed files with 19 additions and 16 deletions
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3
include/linux/suspend.h
View File

@ -425,6 +425,7 @@ void restore_processor_state(void);
/* kernel/power/main.c */
extern int register_pm_notifier(struct notifier_block *nb);
extern int unregister_pm_notifier(struct notifier_block *nb);
extern void ksys_sync_helper(void);
#define pm_notifier(fn, pri) { \
static struct notifier_block fn##_nb = \
@ -462,6 +463,8 @@ static inline int unregister_pm_notifier(struct notifier_block *nb)
return 0;
}
static inline void ksys_sync_helper(void) {}
#define pm_notifier(fn, pri) do { (void)(fn); } while (0)
static inline bool pm_wakeup_pending(void) { return false; }

5
kernel/power/hibernate.c
View File

@ -14,7 +14,6 @@
#include <linux/export.h>
#include <linux/suspend.h>
#include <linux/syscalls.h>
#include <linux/reboot.h>
#include <linux/string.h>
#include <linux/device.h>
@ -709,9 +708,7 @@ int hibernate(void)
goto Exit;
}
pr_info("Syncing filesystems ... \n");
ksys_sync();
pr_info("done.\n");
ksys_sync_helper();
error = freeze_processes();
if (error)

9
kernel/power/main.c
View File

@ -16,6 +16,7 @@
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/suspend.h>
#include <linux/syscalls.h>
#include "power.h"
@ -51,6 +52,14 @@ void unlock_system_sleep(void)
}
EXPORT_SYMBOL_GPL(unlock_system_sleep);
void ksys_sync_helper(void)
{
pr_info("Syncing filesystems ... ");
ksys_sync();
pr_cont("done.\n");
}
EXPORT_SYMBOL_GPL(ksys_sync_helper);
/* Routines for PM-transition notifications */
static BLOCKING_NOTIFIER_HEAD(pm_chain_head);

13
kernel/power/suspend.c
View File

@ -17,7 +17,6 @@
#include <linux/console.h>
#include <linux/cpu.h>
#include <linux/cpuidle.h>
#include <linux/syscalls.h>
#include <linux/gfp.h>
#include <linux/io.h>
#include <linux/kernel.h>
@ -568,13 +567,11 @@ static int enter_state(suspend_state_t state)
if (state == PM_SUSPEND_TO_IDLE)
s2idle_begin();
#ifndef CONFIG_SUSPEND_SKIP_SYNC
trace_suspend_resume(TPS("sync_filesystems"), 0, true);
pr_info("Syncing filesystems ... ");
ksys_sync();
pr_cont("done.\n");
trace_suspend_resume(TPS("sync_filesystems"), 0, false);
#endif
if (!IS_ENABLED(CONFIG_SUSPEND_SKIP_SYNC)) {
trace_suspend_resume(TPS("sync_filesystems"), 0, true);
ksys_sync_helper();
trace_suspend_resume(TPS("sync_filesystems"), 0, false);
}
pm_pr_dbg("Preparing system for sleep (%s)\n", mem_sleep_labels[state]);
pm_suspend_clear_flags();

5
kernel/power/user.c
View File

@ -10,7 +10,6 @@
*/
#include <linux/suspend.h>
#include <linux/syscalls.h>
#include <linux/reboot.h>
#include <linux/string.h>
#include <linux/device.h>
@ -228,9 +227,7 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
if (data->frozen)
break;
printk("Syncing filesystems ... ");
ksys_sync();
printk("done.\n");
ksys_sync_helper();
error = freeze_processes();
if (error)