linux-kernel - Re: [PATCH 05/11] x86, mpx: add MPX to disaabled features

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Message-ID: <5466425D.1060100@cogentembedded.com>
Date:	Fri, 14 Nov 2014 20:56:45 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Dave Hansen <dave@...1.net>, hpa@...or.com
CC:	tglx@...utronix.de, mingo@...hat.com, x86@...nel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linux-ia64@...r.kernel.org, linux-mips@...ux-mips.org,
	qiaowei.ren@...el.com, dave.hansen@...ux.intel.com
Subject: Re: [PATCH 05/11] x86, mpx: add MPX to disaabled features

Hello.

On 11/14/2014 06:18 PM, Dave Hansen wrote:

> From: Dave Hansen <dave.hansen@...ux.intel.com>

> This allows us to use cpu_feature_enabled(X86_FEATURE_MPX) as
> both a runtime and compile-time check.

> When CONFIG_X86_INTEL_MPX is disabled,
> cpu_feature_enabled(X86_FEATURE_MPX) will evaluate at
> compile-time to 0. If CONFIG_X86_INTEL_MPX=y, then the cpuid
> flag will be checked at runtime.

> Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
> Signed-off-by: Qiaowei Ren <qiaowei.ren@...el.com>
> ---

>   b/arch/x86/include/asm/disabled-features.h |    8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)

> diff -puN arch/x86/include/asm/disabled-features.h~mpx-v11-add-MPX-to-disaabled-features arch/x86/include/asm/disabled-features.h
> --- a/arch/x86/include/asm/disabled-features.h~mpx-v11-add-MPX-to-disaabled-features	2014-11-14 07:06:22.297610243 -0800
> +++ b/arch/x86/include/asm/disabled-features.h	2014-11-14 07:06:22.300610378 -0800
[...]
> @@ -34,6 +40,6 @@
>   #define DISABLED_MASK6	0
>   #define DISABLED_MASK7	0
>   #define DISABLED_MASK8	0
> -#define DISABLED_MASK9	0
> +#define DISABLED_MASK9	(DISABLE_MPX)

    These parens are not really needed. Sorry to be a PITA and not saying this 
before.

[...]

WBR, Sergei

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