linux-kernel - Re: [PATCH 07/10] x86, xsave: reduce cpu_has

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Date:	Tue, 20 Jul 2010 15:22:26 -0700
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	Robert Richter <robert.richter@....com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 07/10] x86, xsave: reduce cpu_has_xsave checks

On Tue, 2010-07-20 at 11:50 -0700, Robert Richter wrote:
> This moves the cpu_has_xsave check at the beginning of
> xsave_init(). All other checks may removed then.
> 
> Signed-off-by: Robert Richter <robert.richter@....com>

Acked-by: Suresh Siddha <suresh.b.siddha@...el.com>

> ---
>  arch/x86/kernel/xsave.c |    9 +++------
>  1 files changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/x86/kernel/xsave.c b/arch/x86/kernel/xsave.c
> index a594f49..550bf45 100644
> --- a/arch/x86/kernel/xsave.c
> +++ b/arch/x86/kernel/xsave.c
> @@ -362,9 +362,6 @@ unsigned int sig_xstate_size = sizeof(struct _fpstate);
>   */
>  static void __cpuinit __xsave_init(void)
>  {
> -	if (!cpu_has_xsave)
> -		return;
> -
>  	set_in_cr4(X86_CR4_OSXSAVE);
>  
>  	/*
> @@ -433,9 +430,6 @@ static void __cpuinit xsave_cntxt_init(void)
>  {
>  	unsigned int eax, ebx, ecx, edx;
>  
> -	if (!cpu_has_xsave)
> -		return;
> -
>  	cpuid_count(0xd, 0, &eax, &ebx, &ecx, &edx);
>  	pcntxt_mask = eax + ((u64)edx << 32);
>  
> @@ -469,6 +463,9 @@ static void __cpuinit xsave_cntxt_init(void)
>  
>  void __cpuinit xsave_init(void)
>  {
> +	if (!cpu_has_xsave)
> +		return;
> +
>  	/*
>  	 * Boot processor to setup the FP and extended state context info.
>  	 */

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