linux-kernel - [tip:x86/mpx] x86, mpx: Add MPX to disabled features

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Date:	Mon, 17 Nov 2014 16:06:14 -0800
From:	tip-bot for Dave Hansen <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com,
	dave.hansen@...ux.intel.com, qiaowei.ren@...el.com,
	mingo@...nel.org, tglx@...utronix.de, dave@...1.net
Subject: [tip:x86/mpx] x86, mpx: Add MPX to disabled features

Commit-ID:  95290cf13e561b52dceadb9a8b8ee8ff2464b142
Gitweb:     http://git.kernel.org/tip/95290cf13e561b52dceadb9a8b8ee8ff2464b142
Author:     Dave Hansen <dave.hansen@...ux.intel.com>
AuthorDate: Fri, 14 Nov 2014 07:18:23 -0800
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Tue, 18 Nov 2014 00:58:53 +0100

x86, mpx: Add MPX to disabled 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.

Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Qiaowei Ren <qiaowei.ren@...el.com>
Cc: linux-mm@...ck.org
Cc: linux-mips@...ux-mips.org
Cc: Dave Hansen <dave@...1.net>
Link: http://lkml.kernel.org/r/20141114151823.B358EAD2@viggo.jf.intel.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/include/asm/disabled-features.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

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 */
--
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