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From: tip-bot for H. Peter Anvin on 11 May 2010 20:20
Commit-ID: dce8bf4e115aa44d590802ce3554e926840c9042
Gitweb: http://git.kernel.org/tip/dce8bf4e115aa44d590802ce3554e926840c9042
Author: H. Peter Anvin <hpa(a)zytor.com>
AuthorDate: Mon, 10 May 2010 13:41:41 -0700
Committer: H. Peter Anvin <hpa(a)zytor.com>
CommitDate: Mon, 10 May 2010 13:41:41 -0700

x86, fpu: Use the proper asm constraint in use_xsave()

The proper constraint for a receiving 8-bit variable is "=qm", not
"=g" which equals "=rim"; even though the "i" will never match, bugs
can and do happen due to the difference between "q" and "r".

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

diff --git a/arch/x86/include/asm/i387.h b/arch/x86/include/asm/i387.h
index 1a8cca3..8002e9c 100644
--- a/arch/x86/include/asm/i387.h
+++ b/arch/x86/include/asm/i387.h
@@ -64,7 +64,7 @@ static inline bool use_xsave(void)
alternative_io("mov $0, %0",
"mov $1, %0",
X86_FEATURE_XSAVE,
- "=g"(has_xsave));
+ "=qm" (has_xsave));

return has_xsave;
}
--
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