* [PATCH] x86, asm: Use CC_SET()/CC_OUT() for __cmpxchg_double
@ 2018-08-20 15:22 Uros Bizjak
0 siblings, 0 replies; only message in thread
From: Uros Bizjak @ 2018-08-20 15:22 UTC (permalink / raw)
To: linux-kernel; +Cc: x86, Uros Bizjak
Remove open-coded uses of set instructions to use CC_SET()/CC_OUT() for __cmpxchg_double.
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
---
arch/x86/include/asm/cmpxchg.h | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm/cmpxchg.h b/arch/x86/include/asm/cmpxchg.h
index a55d79b233d3..bfb85e5844ab 100644
--- a/arch/x86/include/asm/cmpxchg.h
+++ b/arch/x86/include/asm/cmpxchg.h
@@ -242,10 +242,12 @@ extern void __add_wrong_size(void)
BUILD_BUG_ON(sizeof(*(p2)) != sizeof(long)); \
VM_BUG_ON((unsigned long)(p1) % (2 * sizeof(long))); \
VM_BUG_ON((unsigned long)((p1) + 1) != (unsigned long)(p2)); \
- asm volatile(pfx "cmpxchg%c4b %2; sete %0" \
- : "=a" (__ret), "+d" (__old2), \
- "+m" (*(p1)), "+m" (*(p2)) \
- : "i" (2 * sizeof(long)), "a" (__old1), \
+ asm volatile(pfx "cmpxchg%c5b %1" \
+ CC_SET(e) \
+ : CC_OUT(e) (__ret), \
+ "+m" (*(p1)), "+m" (*(p2)), \
+ "+a" (__old1), "+d" (__old2) \
+ : "i" (2 * sizeof(long)), \
"b" (__new1), "c" (__new2)); \
__ret; \
})
--
2.17.1
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