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

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To: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Subject: Re: [PATCH v2 2/2] proc: Ensure we see the exit of each process tid exactly
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Fri, 24 Apr 2020 11:46:51 -0700
Cc: LKML <linux-kernel@xxxxxxxxxxxxxxx>, Linux FS Devel <linux-fsdevel@xxxxxxxxxxxxxxx>, Alexey Dobriyan <adobriyan@xxxxxxxxx>, Alexey Gladkov <legion@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Oleg Nesterov <oleg@xxxxxxxxxx>, Alexey Gladkov <gladkov.alexey@xxxxxxxxx>
In-reply-to: <CAHk-=wj-K3fqdMr-r8WgS8RKPuZOuFbPXCEUe9APrdShn99xsA@mail.gmail.com>

On Fri, Apr 24, 2020 at 11:02 AM Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> 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

References:
- [PATCH v12 0/7] proc: modernize proc to support multiple private instances
  - From: Alexey Gladkov
- [PATCH v2 2/2] proc: Ensure we see the exit of each process tid exactly
  - From: Eric W. Biederman
- Re: [PATCH v2 2/2] proc: Ensure we see the exit of each process tid exactly
  - From: Linus Torvalds
- Re: [PATCH v2 2/2] proc: Ensure we see the exit of each process tid exactly
  - From: Eric W. Biederman
- Re: [PATCH v2 2/2] proc: Ensure we see the exit of each process tid exactly
  - From: Linus Torvalds

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