linux-kernel - Re: [PATCH] signal/sh: Stop gcc warning about an impossible case in do_divide

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Date:   Wed, 30 May 2018 10:54:57 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Rich Felker <dalias@...c.org>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Linux-sh list <linux-sh@...r.kernel.org>
Subject: Re: [PATCH] signal/sh: Stop gcc warning about an impossible case in
 do_divide_error

Hello!

On 5/29/2018 6:00 PM, Eric W. Biederman wrote:

> Geert Uytterhoeven <geert@...ux-m68k.org> reported:
>>    HOSTLD  scripts/mod/modpost
>>    CC      arch/sh/kernel/traps_32.o
>> arch/sh/kernel/traps_32.c: In function 'do_divide_error':
>> arch/sh/kernel/traps_32.c:606:17: error: 'code' may be used uninitialized in this function [-Werror=uninitialized]
>> cc1: all warnings being treated as errors
> 
> It is clear from inspection that do_divide_error is only called with
> TRAP_DIVZERO_ERROR or TRAP_DIVOVF_ERROR, as that is the way
> set_exception_table_vec is called.  So let gcc know the other cases
> should not be considered by returning in all other cases.
> 
> This removes the warning and let's the code continue to build.

    Lets. :-)

> Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Fixes: c65626c0cd4d ("signal/sh: Use force_sig_fault where appropriate")
> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
[...]

MBR, Sergei