linux-kernel - Re: [PATCH] kcsan: test: Initialize dummy variable

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Message-ID: <CAG_fn=V7K2fSOD951uNuk0sAExUxrHRg6hOnpt1Eg=sb8Jo--Q@mail.gmail.com>
Date: Wed, 23 Jul 2025 08:32:13 +0200
From: Alexander Potapenko <glider@...gle.com>
To: Marco Elver <elver@...gle.com>
Cc: Dmitry Vyukov <dvyukov@...gle.com>, Boqun Feng <boqun.feng@...il.com>, kasan-dev@...glegroups.com, 
	linux-kernel@...r.kernel.org, 
	Linux Kernel Functional Testing <lkft@...aro.org>
Subject: Re: [PATCH] kcsan: test: Initialize dummy variable

On Tue, Jul 22, 2025 at 8:39 PM Marco Elver <elver@...gle.com> wrote:
>
> Newer compiler versions rightfully point out:
>
>  kernel/kcsan/kcsan_test.c:591:41: error: variable 'dummy' is
>  uninitialized when passed as a const pointer argument here
>  [-Werror,-Wuninitialized-const-pointer]
>    591 |         KCSAN_EXPECT_READ_BARRIER(atomic_read(&dummy), false);
>        |                                                ^~~~~
>  1 error generated.
>
> Although this particular test does not care about the value stored in
> the dummy atomic variable, let's silence the warning.
>
> Link: https://lkml.kernel.org/r/CA+G9fYu8JY=k-r0hnBRSkQQrFJ1Bz+ShdXNwC1TNeMt0eXaxeA@mail.gmail.com
> Fixes: 8bc32b348178 ("kcsan: test: Add test cases for memory barrier instrumentation")
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
> Signed-off-by: Marco Elver <elver@...gle.com>
Reviewed-by: Alexander Potapenko <glider@...gle.com>