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Subject[tip: x86/cpu] x86/cpu: Use XGETBV and XSETBV mnemonics in fpu/internal.h
The following commit has been merged into the x86/cpu branch of tip:

Commit-ID: 86109813990b5d6d6cfb8072382ee69d11ea9460
Gitweb: https://git.kernel.org/tip/86109813990b5d6d6cfb8072382ee69d11ea9460
Author: Uros Bizjak <ubizjak@gmail.com>
AuthorDate: Tue, 07 Jul 2020 19:47:22 +02:00
Committer: Borislav Petkov <bp@suse.de>
CommitterDate: Tue, 18 Aug 2020 15:49:07 +02:00

x86/cpu: Use XGETBV and XSETBV mnemonics in fpu/internal.h

Current minimum required version of binutils is 2.23, which supports
XGETBV and XSETBV instruction mnemonics.

Replace the byte-wise specification of XGETBV and XSETBV with these
proper mnemonics.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200707174722.58651-1-ubizjak@gmail.com
---
arch/x86/include/asm/fpu/internal.h | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/arch/x86/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h
index 0a460f2..21a8b52 100644
--- a/arch/x86/include/asm/fpu/internal.h
+++ b/arch/x86/include/asm/fpu/internal.h
@@ -602,9 +602,7 @@ static inline u64 xgetbv(u32 index)
{
u32 eax, edx;

- asm volatile(".byte 0x0f,0x01,0xd0" /* xgetbv */
- : "=a" (eax), "=d" (edx)
- : "c" (index));
+ asm volatile("xgetbv" : "=a" (eax), "=d" (edx) : "c" (index));
return eax + ((u64)edx << 32);
}

@@ -613,8 +611,7 @@ static inline void xsetbv(u32 index, u64 value)
u32 eax = value;
u32 edx = value >> 32;

- asm volatile(".byte 0x0f,0x01,0xd1" /* xsetbv */
- : : "a" (eax), "d" (edx), "c" (index));
+ asm volatile("xsetbv" :: "a" (eax), "d" (edx), "c" (index));
}

#endif /* _ASM_X86_FPU_INTERNAL_H */
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