linux-kernel - [PATCH v9 04/12] x86, mpx: add MPX to disaabled features

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Message-Id: <1413088915-13428-5-git-send-email-qiaowei.ren@intel.com>
Date:	Sun, 12 Oct 2014 12:41:47 +0800
From:	Qiaowei Ren <qiaowei.ren@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...el.com>
Cc:	x86@...nel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linux-ia64@...r.kernel.org, linux-mips@...ux-mips.org,
	Qiaowei Ren <qiaowei.ren@...el.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>
Subject: [PATCH v9 04/12] x86, mpx: add MPX to disaabled features

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.

This patch must be applied after another Dave's commit:
  381aa07a9b4e1f82969203e9e4863da2a157781d

Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
Signed-off-by: Qiaowei Ren <qiaowei.ren@...el.com>
---
 arch/x86/include/asm/disabled-features.h |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/arch/x86/include/asm/disabled-features.h b/arch/x86/include/asm/disabled-features.h
index 97534a7..f226df0 100644
--- a/arch/x86/include/asm/disabled-features.h
+++ b/arch/x86/include/asm/disabled-features.h
@@ -10,6 +10,12 @@
  * 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
 # define DISABLE_VME		(1<<(X86_FEATURE_VME & 31))
 # define DISABLE_K6_MTRR	(1<<(X86_FEATURE_K6_MTRR & 31))
@@ -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)
 
 #endif /* _ASM_X86_DISABLED_FEATURES_H */
-- 
1.7.1

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