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Diffstat (limited to 'arch/x86/lib/atomic64_32.c')
-rw-r--r--arch/x86/lib/atomic64_32.c19
1 files changed, 7 insertions, 12 deletions
diff --git a/arch/x86/lib/atomic64_32.c b/arch/x86/lib/atomic64_32.c
index afa5d444918..5fc1e2caa54 100644
--- a/arch/x86/lib/atomic64_32.c
+++ b/arch/x86/lib/atomic64_32.c
@@ -6,19 +6,14 @@
static inline u64 cmpxchg8b(u64 *ptr, u64 old, u64 new)
{
- asm volatile(
-
- LOCK_PREFIX "cmpxchg8b (%[ptr])\n"
-
- : "=A" (old)
-
- : [ptr] "D" (ptr),
- "A" (old),
- "b" (ll_low(new)),
- "c" (ll_high(new))
-
- : "memory");
+ u32 low = new;
+ u32 high = new >> 32;
+ asm volatile(
+ LOCK_PREFIX "cmpxchg8b %1\n"
+ : "+A" (old), "+m" (*ptr)
+ : "b" (low), "c" (high)
+ );
return old;
}