linux-kernel - Re: [PATCH 3/5] kernel: add support for TIF_NOTIFY

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Message-ID: <20201015145359.GA14671@redhat.com>
Date:   Thu, 15 Oct 2020 16:53:59 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-kernel@...r.kernel.org, io-uring@...r.kernel.org,
        peterz@...radead.org, tglx@...utronix.de
Subject: Re: [PATCH 3/5] kernel: add support for TIF_NOTIFY_SIGNAL

On 10/15, Oleg Nesterov wrote:
>
> On 10/15, Jens Axboe wrote:
> >
> > That is indeed a worry. From a functionality point of view, with the
> > major archs supporting it, I'm not too worried about that side. But it
> > does mean that we'll be stuck with the ifdeffery forever, which isn't
> > great.
>
> plus we can't kill the ugly JOBCTL_TASK_WORK.

not to mention we can not change freezer/livepatch to use NOTIFY_SIGNAL,
or add new users of set_notify_signal().

Oleg.