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SubjectRe: [PATCH -mm 2/6] Freezer: Fix memory ordering in refrigerator
On 02/26, Rafael J. Wysocki wrote:
>
> From: Oleg Nesterov <oleg@tv-sign.ru>
>
> refrigerator() can miss a wakeup, "wait event" loop needs a proper memory
> ordering.
>
> Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
> Acked-by: Pavel Machek <pavel@ucw.cz>
> ---
> kernel/power/process.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> Index: linux-2.6.20-mm2/kernel/power/process.c
> ===================================================================
> --- linux-2.6.20-mm2.orig/kernel/power/process.c
> +++ linux-2.6.20-mm2/kernel/power/process.c
> @@ -47,8 +47,10 @@ void refrigerator(void)
> recalc_sigpending(); /* We sent fake signal, clean it up */
> spin_unlock_irq(&current->sighand->siglock);
>
> - while (frozen(current)) {
> - current->state = TASK_UNINTERRUPTIBLE;
> + for (;;) {
> + set_current_state(TASK_UNINTERRUPTIBLE);
> + if (!frozen(current))
> + break;
> schedule();
> }
> pr_debug("%s left refrigerator\n", current->comm);

This one is already in -mm tree.

Oleg.

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