linux-kernel - [RFC][PATCH 2/3] x86: add more disabled features

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Date:	Fri, 20 Jun 2014 09:17:38 -0700
From:	Dave Hansen <dave@...1.net>
To:	linux-kernel@...r.kernel.org
Cc:	bp@...en8.de, x86@...nel.org, hpa@...or.com,
	Dave Hansen <dave@...1.net>
Subject: [RFC][PATCH 2/3] x86: add more disabled features


There are a few other features than MPX that we can make
assumptions about at compile-time based on compile options.
Add them to disabled-features.h

---

 b/arch/x86/include/asm/cpufeature.h        |   18 ------------------
 b/arch/x86/include/asm/disabled-features.h |   16 ++++++++++++++--
 2 files changed, 14 insertions(+), 20 deletions(-)

diff -puN arch/x86/include/asm/cpufeature.h~x86-disabled_features-addmore arch/x86/include/asm/cpufeature.h
--- a/arch/x86/include/asm/cpufeature.h~x86-disabled_features-addmore	2014-06-20 09:16:08.420317511 -0700
+++ b/arch/x86/include/asm/cpufeature.h	2014-06-20 09:16:08.425317736 -0700
@@ -357,32 +357,14 @@ extern const char * const x86_power_flag
 #define cpu_has_eager_fpu	boot_cpu_has(X86_FEATURE_EAGER_FPU)
 #define cpu_has_topoext		boot_cpu_has(X86_FEATURE_TOPOEXT)
 
-#ifdef CONFIG_X86_INTEL_MPX
-#define cpu_has_mpx boot_cpu_has(X86_FEATURE_MPX)
-#else
-#define cpu_has_mpx 0
-#endif /* CONFIG_X86_INTEL_MPX */
-
 #ifdef CONFIG_X86_64
 
-#undef  cpu_has_vme
-#define cpu_has_vme		0
-
 #undef  cpu_has_pae
 #define cpu_has_pae		___BUG___
 
 #undef  cpu_has_mp
 #define cpu_has_mp		1
 
-#undef  cpu_has_k6_mtrr
-#define cpu_has_k6_mtrr		0
-
-#undef  cpu_has_cyrix_arr
-#define cpu_has_cyrix_arr	0
-
-#undef  cpu_has_centaur_mcr
-#define cpu_has_centaur_mcr	0
-
 #endif /* CONFIG_X86_64 */
 
 #if __GNUC__ >= 4
diff -puN arch/x86/include/asm/disabled-features.h~x86-disabled_features-addmore arch/x86/include/asm/disabled-features.h
--- a/arch/x86/include/asm/disabled-features.h~x86-disabled_features-addmore	2014-06-20 09:16:08.422317600 -0700
+++ b/arch/x86/include/asm/disabled-features.h	2014-06-20 09:16:08.426317782 -0700
@@ -16,13 +16,25 @@
 # define HAVE_MPX	0
 #endif
 
+#ifdef CONFIG_X86_64
+# define HAVE_VME		(1<<(X86_FEATURE_VME & 31))
+# define HAVE_K6_MTRR		(1<<(X86_FEATURE_K6_MTRR & 31))
+# define HAVE_CYRIX_ARR		(1<<(X86_FEATURE_CYRIX_ARR & 31))
+# define HAVE_CENTAUR_MCR	(1<<(X86_FEATURE_CENTAUR_MCR & 31))
+#else
+# define HAVE_VME		0
+# define HAVE_K6_MTRR		0
+# define HAVE_CYRIX_ARR		0
+# define HAVE_CENTAUR_MCR	0
+#endif /* CONFIG_X86_64 */
+
 /*
  * Make sure to add features to the correct mask
  */
-#define DISABLED_MASK0	0
+#define DISABLED_MASK0	(HAVE_VME|HAVE_K6_MTRR)
 #define DISABLED_MASK1	0
 #define DISABLED_MASK2	0
-#define DISABLED_MASK3	0
+#define DISABLED_MASK3	(HAVE_CYRIX_ARR|HAVE_CENTAUR_MCR)
 #define DISABLED_MASK4	0
 #define DISABLED_MASK5	0
 #define DISABLED_MASK6	0
_
--
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