Messages in this thread Patch in this message | | | From | Qiaowei Ren <> | Subject | [PATCH v8 03/10] x86, mpx: add macro cpu_has_mpx | Date | Thu, 11 Sep 2014 16:46:43 +0800 |
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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 <qiaowei.ren@intel.com> --- 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 bb9b258..82ec7ed 100644 --- a/arch/x86/include/asm/cpufeature.h +++ b/arch/x86/include/asm/cpufeature.h @@ -353,6 +353,12 @@ extern const char * const x86_bug_flags[NBUGINTS*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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