linux-kernel - Re: [RFC][PATCH 1/3] x86: introduce disabled-features

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Date:	Fri, 20 Jun 2014 09:20:45 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Dave Hansen <dave@...1.net>, linux-kernel@...r.kernel.org
CC:	bp@...en8.de, x86@...nel.org
Subject: Re: [RFC][PATCH 1/3] x86: introduce disabled-features

On 06/20/2014 09:17 AM, Dave Hansen wrote:
> diff -puN /dev/null arch/x86/include/asm/disabled-features.h
> --- /dev/null	2014-04-10 11:28:14.066815724 -0700
> +++ b/arch/x86/include/asm/disabled-features.h	2014-06-20 09:15:38.968987152 -0700
> @@ -0,0 +1,33 @@
> +#ifndef _ASM_X86_DISABLED_FEATURES_H
> +#define _ASM_X86_DISABLED_FEATURES_H
> +
> +/* These features, although they might be available in a CPU
> + * will not be used because the compile options to support
> + * them are not present.
> + *
> + * This code allows them to be checked and disabled at
> + * compile time withut an explicit #ifdef.  Simply call
> + * cpu_has() or this_cpu_has().
> + * */
> +
> +#ifdef CONFIG_X86_INTEL_MPX
> +# define HAVE_MPX	(1<<(X86_FEATURE_MPX & 31))
> +#else
> +# define HAVE_MPX	0
> +#endif
> +

Is this an inverted test?

	-hpa

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