linux-kernel - [PATCH] x86, pkeys: fix mismerge of protection keys CPUID bits

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Date:	Thu, 10 Mar 2016 14:12:13 -0800
From:	Dave Hansen <dave@...1.net>
To:	linux-kernel@...r.kernel.org
Cc:	Dave Hansen <dave@...1.net>, dave.hansen@...ux.intel.com,
	x86@...nel.org, bp@...e.de, luto@...nel.org,
	kirill.shutemov@...ux.intel.com
Subject: [PATCH] x86, pkeys: fix mismerge of protection keys CPUID bits


From: Dave Hansen <dave.hansen@...ux.intel.com>

Kirill Shutemov pointed this out to me.

The tip tree currently has commit:

	dfb4a70f2 [x86/cpufeature, x86/mm/pkeys: Add protection keys related CPUID definitions]

whioch added support for two new CPUID bits: X86_FEATURE_PKU and
X86_FEATURE_OSPKE.  But, those bits were mis-merged and put in
cpufeature.h instead of cpufeatures.h.

This didn't cause any breakage *except* it keeps the "ospke" and
"pku" bits from showing up in cpuinfo.

Now cpuinfo has the two new flags:

	flags	: ...  pku ospke

BTW, is it really wise to have cpufeature.h and cpufeatures.h?
It seems like they can only cause confusion and mahem with tab
completion.

Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: x86@...nel.org
Cc: Borislav Petkov <bp@...e.de>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: kirill.shutemov@...ux.intel.com
---

 b/arch/x86/include/asm/cpufeature.h  |    4 ----
 b/arch/x86/include/asm/cpufeatures.h |    4 ++++
 2 files changed, 4 insertions(+), 4 deletions(-)

diff -puN arch/x86/include/asm/cpufeature.h~fix-next-mismerge arch/x86/include/asm/cpufeature.h
--- a/arch/x86/include/asm/cpufeature.h~fix-next-mismerge	2016-03-10 13:54:07.697446555 -0800
+++ b/arch/x86/include/asm/cpufeature.h	2016-03-10 13:54:15.944822125 -0800
@@ -94,10 +94,6 @@ extern const char * const x86_bug_flags[
 	(__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : 	\
 	 x86_this_cpu_test_bit(bit, (unsigned long *)&cpu_info.x86_capability))
 
-/* Intel-defined CPU features, CPUID level 0x00000007:0 (ecx), word 16 */
-#define X86_FEATURE_PKU		(16*32+ 3) /* Protection Keys for Userspace */
-#define X86_FEATURE_OSPKE	(16*32+ 4) /* OS Protection Keys Enable */
-
 /*
  * This macro is for detection of features which need kernel
  * infrastructure to be used.  It may *not* directly test the CPU
diff -puN arch/x86/include/asm/cpufeatures.h~fix-next-mismerge arch/x86/include/asm/cpufeatures.h
--- a/arch/x86/include/asm/cpufeatures.h~fix-next-mismerge	2016-03-10 13:54:07.698446601 -0800
+++ b/arch/x86/include/asm/cpufeatures.h	2016-03-10 13:54:23.506166451 -0800
@@ -271,6 +271,10 @@
 #define X86_FEATURE_PFTHRESHOLD (15*32+12) /* pause filter threshold */
 #define X86_FEATURE_AVIC	(15*32+13) /* Virtual Interrupt Controller */
 
+/* Intel-defined CPU features, CPUID level 0x00000007:0 (ecx), word 16 */
+#define X86_FEATURE_PKU		(16*32+ 3) /* Protection Keys for Userspace */
+#define X86_FEATURE_OSPKE	(16*32+ 4) /* OS Protection Keys Enable */
+
 /*
  * BUG word(s)
  */
_