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From: Oleg Nesterov <oleg@redhat.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: linux-kernel@vger.kernel.org, io-uring@vger.kernel.org,
	peterz@infradead.org, tglx@linutronix.de
Subject: Re: [PATCH 3/4] kernel: add support for TIF_NOTIFY_SIGNAL
Date: Fri, 9 Oct 2020 16:43:29 +0200	[thread overview]
Message-ID: <20201009144328.GB14523@redhat.com> (raw)
In-Reply-To: <20201008152752.218889-4-axboe@kernel.dk>

Once again, I am fine with this patch, just a minor comment...

On 10/08, Jens Axboe wrote:
>
> --- a/arch/x86/kernel/signal.c
> +++ b/arch/x86/kernel/signal.c
> @@ -808,7 +808,10 @@ void arch_do_signal(struct pt_regs *regs)
>  {
>  	struct ksignal ksig;
>
> -	if (get_signal(&ksig)) {
> +	if (test_thread_flag(TIF_NOTIFY_SIGNAL))
> +		tracehook_notify_signal();
> +
> +	if (task_sigpending(current) && get_signal(&ksig)) {

I suggested to change arch_do_signal() because somehow I like it this way ;)

And because we can easily pass the "ti_work" mask to arch_do_signal() and
avoid test_thread_flag/task_sigpending.

Hmm. I just noticed that only x86 uses arch_do_signal(), so perhaps you can
add this change to this patch right now? Up to you.



On the other hand, we could add

	if (test_thread_flag(TIF_NOTIFY_SIGNAL))
		tracehook_notify_signal();

	if (!task_sigpending(current))
		return 0;

at the start of get_signal() instead. Somehow I don't really like this, but
this way we do need less changes in arch-dependant code. Again, up to you.

Oleg.


  reply	other threads:[~2020-10-09 14:43 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-08 15:27 [PATCHSET v4] Add " Jens Axboe
2020-10-08 15:27 ` [PATCH 1/4] tracehook: clear TIF_NOTIFY_RESUME in tracehook_notify_resume() Jens Axboe
2020-10-13 23:35   ` Thomas Gleixner
2020-10-14  1:13     ` Jens Axboe
2020-10-08 15:27 ` [PATCH 2/4] kernel: add task_sigpending() helper Jens Axboe
2020-10-13 23:36   ` Thomas Gleixner
2020-10-08 15:27 ` [PATCH 3/4] kernel: add support for TIF_NOTIFY_SIGNAL Jens Axboe
2020-10-09 14:43   ` Oleg Nesterov [this message]
2020-10-09 15:13     ` Jens Axboe
2020-10-13 23:45       ` Thomas Gleixner
2020-10-13 23:54         ` Jens Axboe
2020-10-13 23:42   ` Thomas Gleixner
2020-10-13 23:45     ` Jens Axboe
2020-10-08 15:27 ` [PATCH 4/4] task_work: use TIF_NOTIFY_SIGNAL if available Jens Axboe
2020-10-13 23:50   ` Thomas Gleixner
2020-10-13 23:55     ` Jens Axboe
2020-10-09 14:30 ` [PATCHSET v4] Add support for TIF_NOTIFY_SIGNAL Oleg Nesterov
2020-10-09 15:16   ` Jens Axboe

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