linux-kernel - Re: [PATCH 1/1] XEN: enlighten, use uninitialized

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Message-ID: <4A9465DE.2030709@goop.org>
Date:	Tue, 25 Aug 2009 15:29:50 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Jiri Slaby <jirislaby@...il.com>
CC:	jeremy@...source.com, chrisw@...s-sol.org,
	virtualization@...ts.osdl.org, xen-devel@...ts.xensource.com,
	linux-kernel@...r.kernel.org,
	the arch/x86 maintainers <x86@...nel.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH 1/1] XEN: enlighten, use uninitialized_var(cx)

On 08/25/09 14:00, Jiri Slaby wrote:
> To avoid a wrong compiler warning, use unitialized_var(cx) in
> xen_init_cpuid_mask.
>
> cx needn't be initialized for cpuid when ax is 1.
>
> Signed-off-by: Jiri Slaby <jirislaby@...il.com>
> Cc: Jeremy Fitzhardinge <jeremy@...source.com>
> Cc: Chris Wright <chrisw@...s-sol.org>
>   
Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>

> ---
>  arch/x86/xen/enlighten.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
> index e90540a..5ab75e2 100644
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -202,7 +202,7 @@ static void xen_cpuid(unsigned int *ax, unsigned int *bx,
>  
>  static __init void xen_init_cpuid_mask(void)
>  {
> -	unsigned int ax, bx, cx, dx;
> +	unsigned int ax, bx, uninitialized_var(cx), dx;
>  
>  	cpuid_leaf1_edx_mask =
>  		~((1 << X86_FEATURE_MCE)  |  /* disable MCE */
>   

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