linux-kernel - Re: [RFC] signal:remove duplicate code

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Date:	Mon, 25 May 2015 10:53:34 +0200
From:	Richard Weinberger <richard@....at>
To:	yalin wang <yalin.wang2010@...il.com>, oleg@...hat.com,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	vdavydov@...allels.com
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] signal:remove duplicate code

Am 25.05.2015 um 07:49 schrieb yalin wang:
> __dequeue_signal() is only called by dequeue_signal(), after that,
> dequeue_signal() will call recalc_sigpending(), this function will
> set or unset TIF_SIGPENDING bit, so we don't need do this in
> __dequeue_signal()
> 
> Signed-off-by: yalin wang <yalin.wang2010@...il.com>
> ---
>  kernel/signal.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/kernel/signal.c b/kernel/signal.c
> index 836df8d..de33281 100644
> --- a/kernel/signal.c
> +++ b/kernel/signal.c
> @@ -583,10 +583,9 @@ static int __dequeue_signal(struct sigpending *pending, sigset_t *mask,
>      if (sig) {
>          if (current->notifier) {
>              if (sigismember(current->notifier_mask, sig)) {
> -                if (!(current->notifier)(current->notifier_data)) {
> -                    clear_thread_flag(TIF_SIGPENDING);

Here be dragons.
In __dequeue_signal() we clear TIF_SIGPENDING depending
on the result of ->notifier().
Did you double check that clearing that flag goes hand in hand
with recalc_sigpending()?

Thanks,
//richard
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