linux-kernel - Re: [PATCH -tip] x86: kvm/paging_tmpl.h intialize the variable before using it

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Date:	Sun, 24 May 2009 15:21:34 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
CC:	Ingo Molnar <mingo@...e.hu>, x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -tip] x86: kvm/paging_tmpl.h intialize the variable before
 using it

Jaswinder Singh Rajput wrote:
> May be in some cases paging64_fetch() and paging32_fetch() will return sptep
> without initialization.
>
> Also fixes compilation warning:
>   CC      arch/x86/kernel/io_delay.o
>  arch/x86/kvm/paging_tmpl.h: In function ‘paging64_fetch’:
>  arch/x86/kvm/paging_tmpl.h:279: warning: ‘sptep’ may be used uninitialized in this function
>  arch/x86/kvm/paging_tmpl.h: In function ‘paging32_fetch’:
>  arch/x86/kvm/paging_tmpl.h:279: warning: ‘sptep’ may be used uninitialized in this function
>
> Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
> ---
>  arch/x86/kvm/paging_tmpl.h |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
> index 6bd7020..99cb10d 100644
> --- a/arch/x86/kvm/paging_tmpl.h
> +++ b/arch/x86/kvm/paging_tmpl.h
> @@ -276,7 +276,7 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
>  {
>  	unsigned access = gw->pt_access;
>  	struct kvm_mmu_page *shadow_page;
> -	u64 spte, *sptep;
> +	u64 spte, *sptep = NULL;
>  	int direct;
>  	gfn_t table_gfn;
>  	int r;
>   

It's a false alarm.  Isn't there a macro to shut up the warning?


-- 
error compiling committee.c: too many arguments to function

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