[tip:mm/pkeys] x86/cpu, x86/mm/pkeys: Define new CR4 bit

[tip-bot for Dave Hansen]

Commit-ID:  f28b49d2bcdb9ef9e771b3d6750f40be9d453316
Gitweb:     http://git.kernel.org/tip/f28b49d2bcdb9ef9e771b3d6750f40be9d453316
Author:     Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
AuthorDate: Fri, 12 Feb 2016 13:02:02 -0800
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 16 Feb 2016 10:11:14 +0100

x86/cpu, x86/mm/pkeys: Define new CR4 bit

There is a new bit in CR4 for enabling protection keys.  We
will actually enable it later in the series.

Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Cc: Dave Hansen <dave@xxxxxxxx>
Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Link: http://lkml.kernel.org/r/20160212210202.3CFC3DB2@xxxxxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 arch/x86/include/uapi/asm/processor-flags.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/include/uapi/asm/processor-flags.h b/arch/x86/include/uapi/asm/processor-flags.h
index 79887ab..567de50 100644
--- a/arch/x86/include/uapi/asm/processor-flags.h
+++ b/arch/x86/include/uapi/asm/processor-flags.h
@@ -118,6 +118,8 @@
 #define X86_CR4_SMEP		_BITUL(X86_CR4_SMEP_BIT)
 #define X86_CR4_SMAP_BIT	21 /* enable SMAP support */
 #define X86_CR4_SMAP		_BITUL(X86_CR4_SMAP_BIT)
+#define X86_CR4_PKE_BIT		22 /* enable Protection Keys support */
+#define X86_CR4_PKE		_BITUL(X86_CR4_PKE_BIT)
 
 /*
  * x86-64 Task Priority Register, CR8