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SubjectRe: [PATCH] PM/Freezer: Remove references to TIF_FREEZE in comments
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On Tuesday, February 21, 2012, Marcos Paulo de Souza wrote:
> This patch removes all the references in the code about TIF_FREEZE(flag removed by
> the commit a3201227f803ad7fd43180c5195dbe5a2bf998aa).
>
> Suggested-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
> Signed-off-by: Marcos Paulo de Souza <marcos.mage@gmail.com>

Applied.

Thanks,
Rafael


> ---
>
> Sent again to put lkml and linux-pm int cc'ing... Sorry for it...
>
>
> Still there are some references to TIF_FREEZE in
> Documentation/power/freezing-of-tasks.txt, but it looks like that documentation
> needs a more thorough work to reflect how the new freezer works, and hence merely
> removing the references to TIF_FREEZE won't really help. So I have not touched that
> part in this patch.
>
> kernel/exit.c | 2 +-
> kernel/freezer.c | 6 +++---
> kernel/power/process.c | 8 +++-----
> 3 files changed, 7 insertions(+), 9 deletions(-)
>
> diff --git a/kernel/exit.c b/kernel/exit.c
> index 4b4042f..8e6b0e6 100644
> --- a/kernel/exit.c
> +++ b/kernel/exit.c
> @@ -424,7 +424,7 @@ void daemonize(const char *name, ...)
> */
> exit_mm(current);
> /*
> - * We don't want to have TIF_FREEZE set if the system-wide hibernation
> + * We don't want to get frozen, in case system-wide hibernation
> * or suspend transition begins right now.
> */
> current->flags |= (PF_NOFREEZE | PF_KTHREAD);
> diff --git a/kernel/freezer.c b/kernel/freezer.c
> index 9815b8d..11f82a4 100644
> --- a/kernel/freezer.c
> +++ b/kernel/freezer.c
> @@ -99,9 +99,9 @@ static void fake_signal_wake_up(struct task_struct *p)
> * freeze_task - send a freeze request to given task
> * @p: task to send the request to
> *
> - * If @p is freezing, the freeze request is sent by setting %TIF_FREEZE
> - * flag and either sending a fake signal to it or waking it up, depending
> - * on whether it has %PF_FREEZER_NOSIG set.
> + * If @p is freezing, the freeze request is sent either by sending a fake
> + * signal (if it's not a kernel thread) or waking it up (if it's a kernel
> + * thread).
> *
> * RETURNS:
> * %false, if @p is not freezing or already frozen; %true, otherwise
> diff --git a/kernel/power/process.c b/kernel/power/process.c
> index 7e42645..ccb8088 100644
> --- a/kernel/power/process.c
> +++ b/kernel/power/process.c
> @@ -53,11 +53,9 @@ static int try_to_freeze_tasks(bool user_only)
> * It is "frozen enough". If the task does wake
> * up, it will immediately call try_to_freeze.
> *
> - * Because freeze_task() goes through p's
> - * scheduler lock after setting TIF_FREEZE, it's
> - * guaranteed that either we see TASK_RUNNING or
> - * try_to_stop() after schedule() in ptrace/signal
> - * stop sees TIF_FREEZE.
> + * Because freeze_task() goes through p's scheduler lock, it's
> + * guaranteed that TASK_STOPPED/TRACED -> TASK_RUNNING
> + * transition can't race with task state testing here.
> */
> if (!task_is_stopped_or_traced(p) &&
> !freezer_should_skip(p))
>



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