linux-kernel - Re: [GIT PULL] Please pull proc and exec work for 5.7-rc1

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Message-ID: <CAHk-=wjmQREQzDa8LEoA2L=v=nWASk4n9R=G8SuAZ-1NK4FGPA@mail.gmail.com>
Date:   Thu, 9 Apr 2020 17:32:24 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Bernd Edlinger <bernd.edlinger@...mail.de>,
        Waiman Long <longman@...hat.com>,
        Ingo Molnar <mingo@...nel.org>, Will Deacon <will@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Alexey Gladkov <gladkov.alexey@...il.com>,
        Oleg Nesterov <oleg@...hat.com>
Subject: Re: [GIT PULL] Please pull proc and exec work for 5.7-rc1

On Thu, Apr 9, 2020 at 5:30 PM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> Instead of trying to change how notify_count gets decremented, we
> could do something like the attached patch: wait for it to go down to
> zero, yes, but go back and re-check until you don't have to wait any
> more. That should fix the underflow situation. The comment says it
> all.

The "attached" patch wasn't.

Blush.

Here it is. Still entirely and utterly untested.

           Linus

View attachment "patch.diff" of type "text/x-patch" (1583 bytes)