linux-kernel - Re: [PATCH] selftests, x86: fix how check

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Message-ID: <89e684cb-8cac-541b-10f0-39a6ba1089d3@collabora.com>
Date:   Fri, 11 Mar 2022 10:15:20 +0000
From:   Guillaume Tucker <guillaume.tucker@...labora.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Shuah Khan <shuah@...nel.org>, Borislav Petkov <bp@...e.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        kernel@...labora.com, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] selftests, x86: fix how check_cc.sh is being invoked

On 26/02/2022 01:03, Andrew Morton wrote:
> On Fri, 25 Feb 2022 13:15:43 +0000 Guillaume Tucker <guillaume.tucker@...labora.com> wrote:
> 
>> Add quotes around $(CC) when calling check_cc.sh from a Makefile to
>> pass the value as a single argument to the script even if it has
>> several words such as "ccache gcc".  Conversely, remove quotes in
>> check_cc.sh when calling $CC to make it a command with potentially
>> several arguments again.
> 
> This changelog describes the fix, but it fails to describe the problem
> which the patch is fixing!
> 
> Presumably, we're hitting some form of runtime failure under
> undescribed circumstances when running selftests.  But that's just me
> reverse-engineering the patch description.  And me reverse-engineering
> stuff is a gloriously unreliable thing.  Please spell out the problem.

Thanks for the review.  I've just sent a v2 which is rebased on
other changes in linux-next and with a reworked commit message
which should hopefully be clearer.  The issue was seen when
building some kselftest binaries and $CC is defined with multiple
arguments such as "ccache gcc".

Guillaume