Hello. On 11/14/2014 06:18 PM, Dave Hansen wrote:
From: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx> Signed-off-by: Qiaowei Ren <qiaowei.ren@xxxxxxxxx> ---
b/arch/x86/include/asm/disabled-features.h | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff -puN arch/x86/include/asm/disabled-features.h~mpx-v11-add-MPX-to-disaabled-features arch/x86/include/asm/disabled-features.h --- a/arch/x86/include/asm/disabled-features.h~mpx-v11-add-MPX-to-disaabled-features 2014-11-14 07:06:22.297610243 -0800 +++ b/arch/x86/include/asm/disabled-features.h 2014-11-14 07:06:22.300610378 -0800
[...]
@@ -34,6 +40,6 @@ #define DISABLED_MASK6 0 #define DISABLED_MASK7 0 #define DISABLED_MASK8 0 -#define DISABLED_MASK9 0 +#define DISABLED_MASK9 (DISABLE_MPX)
These parens are not really needed. Sorry to be a PITA and not saying this before.
[...] WBR, Sergei
