linux-kernel - Re: [PATCH -tip] sdhci: 'scratch' may be used uninitialized

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Date:	Wed, 1 Oct 2008 01:33:17 -0700
From:	"Steven Noonan" <steven@...inklabs.net>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu, drzeus@...eus.cx,
	"Steven Noonan" <steven@...inklabs.net>
Subject: Re: [PATCH -tip] sdhci: 'scratch' may be used uninitialized

On Wed, Oct 1, 2008 at 1:14 AM, Steven Noonan <steven@...inklabs.net> wrote:
> -       u32 scratch;
> +       u32 uninitialized_var(scratch);

A bit of a further explanation:

The variable 'scratch' is always initialized before it's used. The
conditional which is responsible for initialization of 'scratch' will
always evaluate 'true' when the first loop iteration occurs, and thus,
it's properly initialized. GCC doesn't see this, of course, so using
the uninitialized_var() macro seems to work for silencing this case.

- Steven
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