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

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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@zytor.com>
Cc: Avi Kivity <avi@redhat.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
LKML-Reference: <1273135546-29690-2-git-send-email-avi@redhat.com>
This commit is contained in:
H. Peter Anvin 2010-05-10 13:41:41 -07:00
parent c3f8978ea3
commit dce8bf4e11
1 changed files with 1 additions and 1 deletions
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2
arch/x86/include/asm/i387.h
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@ -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;
}