From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f48.google.com (mail-pa0-f48.google.com [209.85.220.48]) by kanga.kvack.org (Postfix) with ESMTP id 25CA36B0039 for ; Mon, 21 Jul 2014 01:42:31 -0400 (EDT) Received: by mail-pa0-f48.google.com with SMTP id et14so9040727pad.21 for ; Sun, 20 Jul 2014 22:42:30 -0700 (PDT) Received: from mga02.intel.com (mga02.intel.com. [134.134.136.20]) by mx.google.com with ESMTP id j3si1107912pdd.56.2014.07.20.22.42.28 for ; Sun, 20 Jul 2014 22:42:29 -0700 (PDT) From: Qiaowei Ren Subject: [PATCH v7 03/10] x86, mpx: add macro cpu_has_mpx Date: Mon, 21 Jul 2014 13:38:37 +0800 Message-Id: <1405921124-4230-4-git-send-email-qiaowei.ren@intel.com> In-Reply-To: <1405921124-4230-1-git-send-email-qiaowei.ren@intel.com> References: <1405921124-4230-1-git-send-email-qiaowei.ren@intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , Dave Hansen Cc: x86@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Qiaowei Ren 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. Community gave a lot of comments on this macro cpu_has_mpx in previous version. Dave will introduce a patchset about disabled features to fix it later. In this code: if (cpu_has_mpx) do_some_mpx_thing(); The patch series from Dave will introduce a new macro cpu_feature_enabled() (if merged after this patchset) to replace the cpu_has_mpx. if (cpu_feature_enabled(X86_FEATURE_MPX)) do_some_mpx_thing(); Signed-off-by: Qiaowei Ren --- 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) +#else +#define cpu_has_mpx 0 +#endif /* CONFIG_X86_INTEL_MPX */ + #ifdef CONFIG_X86_64 #undef cpu_has_vme -- 1.7.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org