linux-kernel - Re: [PATCH v6 03/10] x86, mpx: add macro cpu_has

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Message-ID: <20140618095739.GA24419@pd.tnic>
Date:	Wed, 18 Jun 2014 11:57:39 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Qiaowei Ren <qiaowei.ren@...el.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...el.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 03/10] x86, mpx: add macro cpu_has_mpx

On Wed, Jun 18, 2014 at 05:44:09PM +0800, Qiaowei Ren wrote:
> In order to do performance optimization, this patch adds macro
> cpu_has_mpx which will directly return 0 when MPX is not supported
> by kernel.
> 
> Signed-off-by: Qiaowei Ren <qiaowei.ren@...el.com>
> ---
>  arch/x86/include/asm/cpufeature.h |    6 ++++++
>  1 files changed, 6 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
> index e265ff9..f302d08 100644
> --- a/arch/x86/include/asm/cpufeature.h
> +++ b/arch/x86/include/asm/cpufeature.h
> @@ -339,6 +339,12 @@ extern const char * const x86_power_flags[32];
>  #define cpu_has_eager_fpu	boot_cpu_has(X86_FEATURE_EAGER_FPU)
>  #define cpu_has_topoext		boot_cpu_has(X86_FEATURE_TOPOEXT)
>  
> +#ifdef CONFIG_X86_INTEL_MPX
> +#define cpu_has_mpx boot_cpu_has(X86_FEATURE_MPX)

I think we don't want those macros anymore because they're obfuscating
the code. You should use static_cpu_has instead.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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