linux-kernel - Re: [PATCH 5/5] task_work: use TIF_NOTIFY

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Message-ID: <20201016145138.GB21989@redhat.com>
Date:   Fri, 16 Oct 2020 16:51:38 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
        io-uring@...r.kernel.org, peterz@...radead.org,
        Roman Gershman <romger@...zon.com>
Subject: Re: [PATCH 5/5] task_work: use TIF_NOTIFY_SIGNAL if available

On 10/16, Thomas Gleixner wrote:
>
> With moving the handling into get_signal() you don't need more changes
> to arch/* than adding the TIF bit, right?

we still need to do something like

	-	if (thread_flags & _TIF_SIGPENDING)
	+	if (thread_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL))
			do_signal(...);

and add _TIF_NOTIFY_SIGNAL to the WORK-PENDING mask in arch/* code.

Oleg.