linux-kernel - Re: [PATCH] xen: xen_init_cpuid_mask: Zero cx before calling xen

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Message-ID: <4A865D86.2050002@goop.org>
Date:	Sat, 15 Aug 2009 00:02:30 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Josh Triplett <josh@...htriplett.org>
CC:	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jeremy Fitzhardinge <jeremy@...source.com>
Subject: Re: [PATCH] xen: xen_init_cpuid_mask: Zero cx before calling xen_cpuid

On 08/08/09 13:15, Josh Triplett wrote:
> CPUID function 1 doesn't use cx, but xen_cpuid doesn't know that,
> resulting in this warning:
>
> arch/x86/xen/enlighten.c: In function ‘xen_start_kernel’:
> arch/x86/xen/enlighten.c:192: warning: ‘cx’ may be used uninitialized in this function
> arch/x86/xen/enlighten.c:205: note: ‘cx’ was declared here
>
> Set cx = 0 to avoid this warning.  This seems preferable to implementing
> a xen_cpuid_nocount without the input constraint for cx, and either of
> those seem preferable to just ignoring the warning.
>   

Thanks, applied.

    J
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