linux-kernel - Re: arch/x86/include/asm/string_32.h:182:25: warning: 'val' may be used uninitialized in this function

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Message-ID: <20200102185205.3af73c99@gandalf.local.home>
Date:   Thu, 2 Jan 2020 18:52:05 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     kbuild test robot <lkp@...el.com>
Cc:     Cong Wang <xiyou.wangcong@...il.com>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: Re: arch/x86/include/asm/string_32.h:182:25: warning: 'val' may be
 used uninitialized in this function

On Thu, 2 Jan 2020 03:51:46 +0800
kbuild test robot <lkp@...el.com> wrote:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   738d2902773e30939a982c8df7a7f94293659810
> commit: 6c3edaf9fd6a3be7fb5bc6931897c24cd3848f84 tracing: Introduce trace event injection
> date:   4 weeks ago
> config: i386-randconfig-a003-20200102 (attached as .config)
> compiler: gcc-6 (Debian 6.3.0-18+deb9u1) 6.3.0 20170516
> reproduce:
>         git checkout 6c3edaf9fd6a3be7fb5bc6931897c24cd3848f84
>         # save the attached .config to linux build tree
>         make ARCH=i386 
> 
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@...el.com>
> 
> Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
> http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

It is a false positive, but it's complex and subtle enough to just set
val to zero and remove the warning.

-- Steve