From: "H. Peter Anvin" <hpa@zytor.com>
To: Dave Hansen <dave@sr71.net>, linux-kernel@vger.kernel.org
Cc: bp@alien8.de, x86@kernel.org
Subject: Re: [RFC][PATCH 1/3] x86: introduce disabled-features
Date: Fri, 20 Jun 2014 09:20:45 -0700 [thread overview]
Message-ID: <53A45F5D.90505@zytor.com> (raw)
In-Reply-To: <20140620161736.D6AC16FD@viggo.jf.intel.com>
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
next prev parent reply other threads:[~2014-06-20 16:21 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-20 16:17 [RFC][PATCH 1/3] x86: introduce disabled-features Dave Hansen
2014-06-20 16:17 ` [RFC][PATCH 2/3] x86: add more disabled features Dave Hansen
2014-06-20 16:17 ` [RFC][PATCH 3/3] x86: make MP a required-feature on 64-bit Dave Hansen
2014-06-20 16:23 ` H. Peter Anvin
2014-06-20 16:30 ` Dave Hansen
2014-06-20 16:37 ` H. Peter Anvin
2014-06-20 17:43 ` Borislav Petkov
2014-06-20 17:47 ` H. Peter Anvin
2014-06-20 18:05 ` Borislav Petkov
2014-06-20 18:16 ` Dave Jones
2014-06-20 18:48 ` Borislav Petkov
2014-06-20 18:54 ` H. Peter Anvin
2014-06-20 20:00 ` Borislav Petkov
2014-06-20 20:22 ` H. Peter Anvin
2014-06-20 20:35 ` Borislav Petkov
2014-06-20 17:50 ` H. Peter Anvin
2014-06-20 18:15 ` Borislav Petkov
2014-06-20 18:57 ` H. Peter Anvin
2014-06-20 20:37 ` Borislav Petkov
2014-06-23 6:11 ` Andi Kleen
2014-06-20 16:20 ` H. Peter Anvin [this message]
2014-06-20 17:20 ` [RFC][PATCH 1/3] x86: introduce disabled-features Dave Hansen
2014-06-20 20:40 ` Dave Hansen
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