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

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Message-Id: <20220225170305.de0aa0dc898ca583d8a83e5c@linux-foundation.org>
Date:   Fri, 25 Feb 2022 17:03:05 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Guillaume Tucker <guillaume.tucker@...labora.com>
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 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.