P6_NOP patch

gistfile1.txt

diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index a4bb92600b0a..e753d31e7fb4 100644
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -319,6 +319,7 @@ config MPSC
 
 config MATOM
 	bool "Intel Atom"
+	select X86_P6_NOP
 	---help---
 
 	  Select this for the Intel Atom platform. Intel Atom CPUs have an
@@ -328,6 +329,7 @@ config MATOM
 
 config MCORE2
 	bool "Intel Core 2"
+	select X86_P6_NOP
 	---help---
 
 	  Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and
@@ -339,6 +341,7 @@ config MCORE2
 
 config MNEHALEM
 	bool "Intel Nehalem"
+	select X86_P6_NOP
 	---help---
 
 	  Select this for 1st Gen Core processors in the Nehalem family.
@@ -347,6 +350,7 @@ config MNEHALEM
 
 config MWESTMERE
 	bool "Intel Westmere"
+	select X86_P6_NOP
 	---help---
 
 	  Select this for the Intel Westmere formerly Nehalem-C family.
@@ -355,6 +359,7 @@ config MWESTMERE
 
 config MSILVERMONT
 	bool "Intel Silvermont"
+	select X86_P6_NOP
 	---help---
 
 	  Select this for the Intel Silvermont platform.
@@ -363,6 +368,7 @@ config MSILVERMONT
 
 config MSANDYBRIDGE
 	bool "Intel Sandy Bridge"
+	select X86_P6_NOP
 	---help---
 
 	  Select this for 2nd Gen Core processors in the Sandy Bridge family.
@@ -371,6 +377,7 @@ config MSANDYBRIDGE
 
 config MIVYBRIDGE
 	bool "Intel Ivy Bridge"
+	select X86_P6_NOP
 	---help---
 
 	  Select this for 3rd Gen Core processors in the Ivy Bridge family.
@@ -379,6 +386,7 @@ config MIVYBRIDGE
 
 config MHASWELL
 	bool "Intel Haswell"
+	select X86_P6_NOP
 	---help---
 
 	  Select this for 4th Gen Core processors in the Haswell family.
@@ -387,6 +395,7 @@ config MHASWELL
 
 config MBROADWELL
 	bool "Intel Broadwell"
+	select X86_P6_NOP
 	---help---
 
 	  Select this for 5th Gen Core processors in the Broadwell family.
@@ -395,6 +404,7 @@ config MBROADWELL
 
 config MSKYLAKE
 	bool "Intel Skylake"
+	select X86_P6_NOP
 	---help---
 
 	  Select this for 6th Gen Core processors in the Skylake family.
@@ -486,21 +496,23 @@ config X86_USE_3DNOW
 	def_bool y
 	depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML
 
-#
-# P6_NOPs are a relatively minor optimization that require a family >=
-# 6 processor, except that it is broken on certain VIA chips.
-# Furthermore, AMD chips prefer a totally different sequence of NOPs
-# (which work on all CPUs).  In addition, it looks like Virtual PC
-# does not understand them.
-#
-# As a result, disallow these if we're not compiling for X86_64 (these
-# NOPs do work on all x86-64 capable chips); the list of processors in
-# the right-hand clause are the cores that benefit from this optimization.
-#
 config X86_P6_NOP
-	def_bool y
+	default n
+	bool "Support for P6_NOPs on Intel chips"
 	depends on X86_64
-	depends on (MCORE2 || MPENTIUM4 || MPSC || MNATIVE)
+	depends on (MCORE2 || MPENTIUM4 || MPSC || MATOM || MNEHALEM || MWESTMERE || MSILVERMONT  || MSANDYBRIDGE || MIVYBRIDGE || MHASWELL || MBROADWELL || MSKYLAKE || MNATIVE)
+	---help---
+	P6_NOPs are a relatively minor optimization that require a family >=
+	6 processor, except that it is broken on certain VIA chips.
+	Furthermore, AMD chips prefer a totally different sequence of NOPs
+	(which work on all CPUs).  In addition, it looks like Virtual PC
+	does not understand them.
+
+	As a result, disallow these if we're not compiling for X86_64 (these
+	NOPs do work on all x86-64 capable chips); the list of processors in
+	the right-hand clause are the cores that benefit from this optimization.
+
+	Say Y if you have Intel CPU newer than Pentium Pro, N otherwise.
 
 config X86_TSC
 	def_bool y