linux-kernel - Re: pselect/etc semantics

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Message-ID: <20190530160823.GI22536@redhat.com>
Date:   Thu, 30 May 2019 18:08:24 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Deepa Dinamani <deepa.kernel@...il.com>,
        Al Viro <viro@...IV.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        arnd@...db.de, dbueso@...e.de, axboe@...nel.dk, dave@...olabs.net,
        e@...24.org, jbaron@...mai.com, linux-fsdevel@...r.kernel.org,
        linux-aio@...ck.org, omar.kilani@...il.com, tglx@...utronix.de,
        stable@...r.kernel.org
Subject: Re: pselect/etc semantics

On 05/30, Eric W. Biederman wrote:
>
> ebiederm@...ssion.com (Eric W. Biederman) writes:
>
> > Which means I believe we have a semantically valid change in behavior
> > that is causing a regression.
>
> I haven't made a survey of all of the functions yet but
> fucntions return -ENORESTARTNOHAND will never return -EINTR and are
> immune from this problem.

Hmm. handle_signal:

		case -ERESTARTNOHAND:
			regs->ax = -EINTR;
			break;

but I am not sure I understand which problem do you mean..

Oleg.