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Commit 49b12d4f authored by Rafael J. Wysocki's avatar Rafael J. Wysocki Committed by Linus Torvalds
Browse files

freezer: take kernel_execve into consideration 



Kernel threads can become userland processes by calling kernel_execve().

In particular, this may happen right after the try_to_freeze_tasks()
called with FREEZER_USER_SPACE has returned, so try_to_freeze_tasks()
needs to take userspace processes into consideration even if it is
called with FREEZER_KERNEL_THREADS.

Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Acked-by: default avatarPavel Machek <pavel@ucw.cz>
Cc: Gautham R Shenoy <ego@in.ibm.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ba96a0c8

kernel/power/process.c

+2 −2
Original line number Original line Diff line number Diff line
@@ -120,7 +120,7 @@ static unsigned int try_to_freeze_tasks(int freeze_user_space) 
				cancel_freezing(p);

				cancel_freezing(p);

				continue;

				continue;

			}

			}

			if (is_user_space(p) == !freeze_user_space)

			if (freeze_user_space && !is_user_space(p))

				continue;

				continue;





			freeze_process(p);

			freeze_process(p);
@@ -147,7 +147,7 @@ static unsigned int try_to_freeze_tasks(int freeze_user_space) 
				TIMEOUT / HZ, todo);

				TIMEOUT / HZ, todo);

		read_lock(&tasklist_lock);

		read_lock(&tasklist_lock);

		do_each_thread(g, p) {

		do_each_thread(g, p) {

			if (is_user_space(p) == !freeze_user_space)

			if (freeze_user_space && !is_user_space(p))

				continue;

				continue;





			task_lock(p);

			task_lock(p);