netdev - Re: [PATCH bpf-next] selftests/bpf: initialize duration variable before using

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Date:   Fri, 24 Jan 2020 11:11:24 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Stanislav Fomichev <sdf@...gle.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Cc:     davem@...emloft.net, ast@...nel.org,
        John Sperbeck <jsperbeck@...gle.com>
Subject: Re: [PATCH bpf-next] selftests/bpf: initialize duration variable
 before using

On 1/24/20 12:51 AM, Stanislav Fomichev wrote:
> From: John Sperbeck <jsperbeck@...gle.com>
> 
> The 'duration' variable is referenced in the CHECK() macro, and there are
> some uses of the macro before 'duration' is set.  The clang compiler
> (validly) complains about this.
> 
> Sample error:
> 
> .../selftests/bpf/prog_tests/fexit_test.c:23:6: warning: variable 'duration' is uninitialized when used here [-Wuninitialized]
>          if (CHECK(err, "prog_load sched cls", "err %d errno %d\n", err, errno))
>              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> .../selftests/bpf/test_progs.h:134:25: note: expanded from macro 'CHECK'
>          if (CHECK(err, "prog_load sched cls", "err %d errno %d\n", err, errno))
>              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>          _CHECK(condition, tag, duration, format)
>                                 ^~~~~~~~
> 
> Signed-off-by: John Sperbeck <jsperbeck@...gle.com>
> Signed-off-by: Stanislav Fomichev <sdf@...gle.com>

Applied, thanks!