linux-kernel - [tip:x86/fpu] x86, fpu: Use static_cpu_has() to implement use

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Message-ID: <tip-c9775b4cc522e5f1b40b1366a993f0f05f600f39@git.kernel.org>
Date:	Wed, 12 May 2010 01:06:58 GMT
From:	"tip-bot for H. Peter Anvin" <hpa@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	suresh.b.siddha@...el.com, tglx@...utronix.de, avi@...hat.com
Subject: [tip:x86/fpu] x86, fpu: Use static_cpu_has() to implement use_xsave()

Commit-ID:  c9775b4cc522e5f1b40b1366a993f0f05f600f39
Gitweb:     http://git.kernel.org/tip/c9775b4cc522e5f1b40b1366a993f0f05f600f39
Author:     H. Peter Anvin <hpa@...or.com>
AuthorDate: Tue, 11 May 2010 17:49:54 -0700
Committer:  H. Peter Anvin <hpa@...or.com>
CommitDate: Tue, 11 May 2010 17:49:54 -0700

x86, fpu: Use static_cpu_has() to implement use_xsave()

use_xsave() is now just a special case of static_cpu_has(), so use
static_cpu_has().

Signed-off-by: H. Peter Anvin <hpa@...or.com>
Cc: Avi Kivity <avi@...hat.com>
Cc: Suresh Siddha <suresh.b.siddha@...el.com>
LKML-Reference: <1273135546-29690-2-git-send-email-avi@...hat.com>
---
 arch/x86/include/asm/i387.h |   12 +++---------
 1 files changed, 3 insertions(+), 9 deletions(-)

diff --git a/arch/x86/include/asm/i387.h b/arch/x86/include/asm/i387.h
index 8002e9c..c991b3a 100644
--- a/arch/x86/include/asm/i387.h
+++ b/arch/x86/include/asm/i387.h
@@ -18,6 +18,7 @@
 #include <linux/hardirq.h>
 #include <linux/slab.h>
 #include <asm/asm.h>
+#include <asm/cpufeature.h>
 #include <asm/processor.h>
 #include <asm/sigcontext.h>
 #include <asm/user.h>
@@ -57,16 +58,9 @@ extern int restore_i387_xstate_ia32(void __user *buf);
 
 #define X87_FSW_ES (1 << 7)	/* Exception Summary */
 
-static inline bool use_xsave(void)
+static __always_inline __pure bool use_xsave(void)
 {
-	u8 has_xsave;
-
-	alternative_io("mov $0, %0",
-		       "mov $1, %0",
-		       X86_FEATURE_XSAVE,
-		       "=qm" (has_xsave));
-
-	return has_xsave;
+	return static_cpu_has(X86_FEATURE_XSAVE);
 }
 
 #ifdef CONFIG_X86_64
--
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