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Date:	Mon, 21 Jul 2014 13:38:37 +0800
From:	Qiaowei Ren <>
To:	"H. Peter Anvin" <>,
	Thomas Gleixner <>,
	Ingo Molnar <>,
	Dave Hansen <>
	Qiaowei Ren <>
Subject: [PATCH v7 03/10] x86, mpx: add macro cpu_has_mpx

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)

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))

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)
+#define cpu_has_mpx boot_cpu_has(X86_FEATURE_MPX)
+#define cpu_has_mpx 0
+#endif /* CONFIG_X86_INTEL_MPX */
 #ifdef CONFIG_X86_64
 #undef  cpu_has_vme

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