linux-kernel - [RFC][PATCH 3/3] x86: make MP a required-feature on 64-bit

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Date:	Fri, 20 Jun 2014 09:17:40 -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 3/3] x86: make MP  a required-feature on 64-bit


Today, we assume that all 64-bit cpus have X86_FEATURE_MP.  It
should be in the REQUIRED_MASK so that we do not need the #undef
trick for it.

---

 b/arch/x86/include/asm/cpufeature.h        |    3 ---
 b/arch/x86/include/asm/required-features.h |    4 +++-
 2 files changed, 3 insertions(+), 4 deletions(-)

diff -puN arch/x86/include/asm/cpufeature.h~x86-make-mp-required_feature arch/x86/include/asm/cpufeature.h
--- a/arch/x86/include/asm/cpufeature.h~x86-make-mp-required_feature	2014-06-20 09:16:10.180396969 -0700
+++ b/arch/x86/include/asm/cpufeature.h	2014-06-20 09:16:10.185397194 -0700
@@ -362,9 +362,6 @@ extern const char * const x86_power_flag
 #undef  cpu_has_pae
 #define cpu_has_pae		___BUG___
 
-#undef  cpu_has_mp
-#define cpu_has_mp		1
-
 #endif /* CONFIG_X86_64 */
 
 #if __GNUC__ >= 4
diff -puN arch/x86/include/asm/required-features.h~x86-make-mp-required_feature arch/x86/include/asm/required-features.h
--- a/arch/x86/include/asm/required-features.h~x86-make-mp-required_feature	2014-06-20 09:16:10.182397059 -0700
+++ b/arch/x86/include/asm/required-features.h	2014-06-20 09:16:10.186397240 -0700
@@ -67,6 +67,7 @@
 #define NEED_XMM	(1<<(X86_FEATURE_XMM & 31))
 #define NEED_XMM2	(1<<(X86_FEATURE_XMM2 & 31))
 #define NEED_LM		(1<<(X86_FEATURE_LM & 31))
+#define NEED_MP		(1<<(X86_FEATURE_MP & 31))
 #else
 #define NEED_PSE	0
 #define NEED_MSR	0
@@ -75,6 +76,7 @@
 #define NEED_XMM	0
 #define NEED_XMM2	0
 #define NEED_LM		0
+#define NEED_MP		0
 #endif
 
 #define REQUIRED_MASK0	(NEED_FPU|NEED_PSE|NEED_MSR|NEED_PAE|\
@@ -82,7 +84,7 @@
 			 NEED_XMM|NEED_XMM2)
 #define SSE_MASK	(NEED_XMM|NEED_XMM2)
 
-#define REQUIRED_MASK1	(NEED_LM|NEED_3DNOW)
+#define REQUIRED_MASK1	(NEED_LM|NEED_3DNOW|NEED_MP)
 
 #define REQUIRED_MASK2	0
 #define REQUIRED_MASK3	(NEED_NOPL)
_
--
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