linux-kernel - Re: [PATCH AUTOSEL 5.5 542/542] pipe: use exclusive waits when reading or writing

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Date:   Tue, 18 Feb 2020 10:53:41 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        Josh Triplett <josh@...htriplett.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH AUTOSEL 5.5 542/542] pipe: use exclusive waits when
 reading or writing

On Fri, Feb 14, 2020 at 8:00 AM Sasha Levin <sashal@...nel.org> wrote:
>
> From: Linus Torvalds <torvalds@...ux-foundation.org>
>
> [ Upstream commit 0ddad21d3e99c743a3aa473121dc5561679e26bb ]
>
> This makes the pipe code use separate wait-queues and exclusive waiting
> for readers and writers, [..]

Oh, and since I didn't react initially, let me react now that Andrei
found a bug here: why was this patch auto-selected for 5.5 stable in
the first place?

It wasn't really a fix, and there's no Fixes: tag or stable tag in
there. Yeah, there's a reference to an old commit, but that one isn't
even a kernel commit.

Yeah, the performance improvements are quite nice if you hit the case
this matters for, but still..

              Linus