The patch titled
freezer: document task_lock in thaw_process
has been removed from the -mm tree. Its filename was
freezer-document-task_lock-in-thaw_process.patch
This patch was dropped because an updated version will be merged
------------------------------------------------------
Subject: freezer: document task_lock in thaw_process
From: Rafael J. Wysocki <rjw@xxxxxxx>
The task_lock() in include/linux/freezer.h:thaw_process() looks as though
it were protecting p->flags, which is not the case. Add a comment that
explains why it's there.
Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
Cc: Gautham R Shenoy <ego@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Acked-by: Pavel Machek <pavel@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/freezer.h | 6 ++++++
1 file changed, 6 insertions(+)
diff -puN include/linux/freezer.h~freezer-document-task_lock-in-thaw_process include/linux/freezer.h
--- a/include/linux/freezer.h~freezer-document-task_lock-in-thaw_process
+++ a/include/linux/freezer.h
@@ -37,6 +37,12 @@ static inline void do_not_freeze(struct
/*
* Wake up a frozen process
+ *
+ * task_lock() is taken to prevent the race with refrigerator() which may
+ * occur if the freezing of tasks fails. Namely, without the lock, if the
+ * freezing of tasks failed, thaw_tasks() might have run before a task in
+ * refrigerator() could call frozen_process(), in which case the task would be
+ * frozen and no one would thaw it.
*/
static inline int thaw_process(struct task_struct *p)
{
_
Patches currently in -mm which might be from rjw@xxxxxxx are
origin.patch
at91-fix-enable-disable_irq_wake-symmetry-in-pcmcia-driver.patch
freezer-document-task_lock-in-thaw_process.patch
move-frozen_process-to-kernel-power-processc.patch
separate-freezer-from-pm-code-rev-2.patch
introduce-freezer-flags-rev-2.patch
add-common-orderly_poweroff.patch
add-suspend-related-notifications-for-cpu-hotplug-statistics.patch
shrink_slab-handle-bad-shrinkers.patch
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