linux-kernel - Re: fs/block_dev.c:953: warning: 'found' might be used uninitialized in this function

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Message-ID: <20070330194011.GK14134@stusta.de>
Date:	Fri, 30 Mar 2007 21:40:11 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	Lee Revell <rlrevell@...-job.com>
Cc:	Toralf Förster <toralf.foerster@....de>,
	andrea@...e.de, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: fs/block_dev.c:953: warning: 'found' might be used uninitialized in this function

On Wed, Mar 28, 2007 at 12:56:59PM -0400, Lee Revell wrote:
> On 3/28/07, Toralf Förster <toralf.foerster@....de> wrote:
> >I compiled current git source 2.6.21-rc5-g28defbe and got this warning:
> >...
> >fs/block_dev.c: In function `bd_claim_by_kobject':
> >fs/block_dev.c:953: warning: 'found' might be used uninitialized in this 
> >function
> >...
> >
> 
> Most of these warnings are really GCC bugs.  Please examine the code
> in question.

The word "GCC bugs" is a bit hard for them.

gcc gives different warnings for code where it could prove that a 
variable gets used uninitialized and code where it's not sure whether a 
variable will always be used initialized.

There are even cases where it's technically impossible for gcc to 
determine that a variable always gets initialized.

And these "might be used uninitialized" warnings have already found 
several kernel bugs.

> Lee

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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