[PATCH v6 03/10] x86, mpx: add macro cpu_has_mpx

[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.

Signed-off-by: Qiaowei Ren <qiaowei.ren@xxxxxxxxx>
---
 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

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