linux-kernel - Re: "elf core dump: fix get_user use" breaks mips compilation

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Message-ID: <20090217074250.GE2495@deprecation.cyrius.com>
Date:	Tue, 17 Feb 2009 08:42:50 +0100
From:	Martin Michlmayr <tbm@...ius.com>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	Roland McGrath <roland@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: "elf core dump: fix get_user use" breaks mips compilation

* Ralf Baechle <ralf@...ux-mips.org> [2009-02-16 23:32]:
> Partially expanding get_user() the code basically does this:
> 
> 	int word;
> 
> 	if (access_ok(...))
> 		__get_user(word, header);
> 	else
> 		word = 0;
> 
> And gcc is unable to figure out that word will always be assigned to by
> both paths of the if statement.  Older gcc versions used to have that
> problem.  I can't reproduce your problem with gcc 4.3.2 and I assume
> you're using something older than that?

Yes, gcc 4.1.
-- 
Martin Michlmayr
http://www.cyrius.com/
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