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Message-ID: <202110211309.A4DFAE27@keescook>
Date:   Thu, 21 Oct 2021 13:10:19 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Mark Rutland <mark.rutland@....com>, Shuah Khan <shuah@...nel.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        linux-kselftest@...r.kernel.org,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexey Gladkov <gladkov.alexey@...il.com>, jannh@...gle.com,
        vcaputo@...garu.com, mingo@...hat.com, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, christian.brauner@...ntu.com,
        amistry@...gle.com, Kenta.Tada@...y.com, legion@...nel.org,
        michael.weiss@...ec.fraunhofer.de, mhocko@...e.com, deller@....de,
        zhengqi.arch@...edance.com, me@...in.cc, tycho@...ho.pizza,
        tglx@...utronix.de, bp@...en8.de, hpa@...or.com, axboe@...nel.dk,
        metze@...ba.org, laijs@...ux.alibaba.com, luto@...nel.org,
        dave.hansen@...ux.intel.com, ebiederm@...ssion.com,
        ohoono.kwon@...sung.com, kaleshsingh@...gle.com,
        yifeifz2@...inois.edu, linux-arch@...r.kernel.org,
        vgupta@...nel.org, linux@...linux.org.uk, will@...nel.org,
        guoren@...nel.org, bcain@...eaurora.org, monstr@...str.eu,
        tsbogend@...ha.franken.de, nickhu@...estech.com,
        jonas@...thpole.se, mpe@...erman.id.au, paul.walmsley@...ive.com,
        hca@...ux.ibm.com, ysato@...rs.sourceforge.jp, davem@...emloft.net,
        chris@...kel.net, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] selftests: proc: Make sure wchan works when it exists

On Thu, Oct 21, 2021 at 09:30:33PM +0200, Peter Zijlstra wrote:
> On Thu, Oct 21, 2021 at 10:09:33AM -0700, Kees Cook wrote:
> 
> > > Hi Peter,
> > > 
> > > Can you add this to the wchan series, please? This should help wchan from
> > > regressing in the future, and allow us to notice if the depth accidentally
> > > changes, like Mark saw.
> > > ---
> > 
> > I'd like to make sure we have a regression test for this. Will you add
> > this to the wchan series please?
> 
> I have it there, but it's in the part that didn't make it in yet. I'm
> currently in the progress of reworking that.
> 
> Do you want it it ahead of all that?

Nah, that's fine. I'm not in any rush; I just wanted to make sure it
didn't get lost. I didn't realize it was already there (I had only seen
the -tip emails). Sorry for the noise; thanks!

-Kees

-- 
Kees Cook

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