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x86, mpx: Add MPX to disabled features

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This allows us to use cpu_feature_enabled(X86_FEATURE_MPX) as
both a runtime and compile-time check.

When CONFIG_X86_INTEL_MPX is disabled,
cpu_feature_enabled(X86_FEATURE_MPX) will evaluate at
compile-time to 0. If CONFIG_X86_INTEL_MPX=y, then the cpuid
flag will be checked at runtime.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Qiaowei Ren <qiaowei.ren@intel.com>
Cc: linux-mm@kvack.org
Cc: linux-mips@linux-mips.org
Cc: Dave Hansen <dave@sr71.net>
Link: http://lkml.kernel.org/r/20141114151823.B358EAD2@viggo.jf.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Dave Hansen
2014-11-14 07:18:23 -08:00
committed by Thomas Gleixner
parent 53f037b08b
commit 95290cf13e
1 changed files with 7 additions and 1 deletions
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arch/x86/include/asm/disabled-features.h
+7 -1
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@@ -10,6 +10,12 @@
* cpu_feature_enabled(). * cpu_feature_enabled().
*/ */
#ifdef CONFIG_X86_INTEL_MPX
# define DISABLE_MPX 0
#else
# define DISABLE_MPX (1<<(X86_FEATURE_MPX & 31))
#endif
#ifdef CONFIG_X86_64 #ifdef CONFIG_X86_64
# define DISABLE_VME (1<<(X86_FEATURE_VME & 31)) # define DISABLE_VME (1<<(X86_FEATURE_VME & 31))
# define DISABLE_K6_MTRR (1<<(X86_FEATURE_K6_MTRR & 31)) # define DISABLE_K6_MTRR (1<<(X86_FEATURE_K6_MTRR & 31))
@@ -34,6 +40,6 @@
#define DISABLED_MASK6 0 #define DISABLED_MASK6 0
#define DISABLED_MASK7 0 #define DISABLED_MASK7 0
#define DISABLED_MASK8 0 #define DISABLED_MASK8 0
#define DISABLED_MASK9 0 #define DISABLED_MASK9 (DISABLE_MPX)
#endif /* _ASM_X86_DISABLED_FEATURES_H */ #endif /* _ASM_X86_DISABLED_FEATURES_H */