linux-kernel - Re: [PATCH v2 2/2] proc: Ensure we see the exit of each process tid exactly

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Message-ID: <CAHk-=wg9RQ4rc-TmiP0-rdGPGje2uAX5aWh+=pFhfVdKq=u+aA@mail.gmail.com>
Date:   Fri, 24 Apr 2020 11:46:51 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Alexey Gladkov <legion@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Alexey Gladkov <gladkov.alexey@...il.com>
Subject: Re: [PATCH v2 2/2] proc: Ensure we see the exit of each process tid exactly

On Fri, Apr 24, 2020 at 11:02 AM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
>  [..] even a "double cmpxchg" is
> actually just a double-_sized_ one, not a two different locations
> one

Historical accuracy side note: the 68020 actually had a CAS2 that was
"two different locations".

Maybe somebody else did too.

            Linus