The following commit has been merged into the locking/core branch of tip:
Commit-ID: 25cf4fbb596d730476afcc0fb87a9d708db14078
Gitweb: https://git.kernel.org/tip/25cf4fbb596d730476afcc0fb87a9d708db14078
Author: Uros Bizjak <ubizjak@xxxxxxxxx>
AuthorDate: Sun, 03 Nov 2024 17:09:32 +01:00
Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Tue, 05 Nov 2024 12:55:34 +01:00
locking/atomic/x86: Use ALT_OUTPUT_SP() for __arch_{,try_}cmpxchg64_emu()
x86_32 __arch_{,try_}cmpxchg64_emu()() macros use CALL instruction
inside asm statement. Use ALT_OUTPUT_SP() macro to add required
dependence on %esp register.
Fixes: 79e1dd05d1a2 ("x86: Provide an alternative() based cmpxchg64()")
Signed-off-by: Uros Bizjak <ubizjak@xxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/20241103160954.3329-2-ubizjak@xxxxxxxxx
---
arch/x86/include/asm/cmpxchg_32.h | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/cmpxchg_32.h b/arch/x86/include/asm/cmpxchg_32.h
index 62cef21..fd1282a 100644
--- a/arch/x86/include/asm/cmpxchg_32.h
+++ b/arch/x86/include/asm/cmpxchg_32.h
@@ -94,7 +94,7 @@ static __always_inline bool __try_cmpxchg64_local(volatile u64 *ptr, u64 *oldp,
asm volatile(ALTERNATIVE(_lock_loc \
"call cmpxchg8b_emu", \
_lock "cmpxchg8b %a[ptr]", X86_FEATURE_CX8) \
- : "+a" (o.low), "+d" (o.high) \
+ : ALT_OUTPUT_SP("+a" (o.low), "+d" (o.high)) \
: "b" (n.low), "c" (n.high), [ptr] "S" (_ptr) \
: "memory"); \
\
@@ -123,8 +123,8 @@ static __always_inline u64 arch_cmpxchg64_local(volatile u64 *ptr, u64 old, u64
"call cmpxchg8b_emu", \
_lock "cmpxchg8b %a[ptr]", X86_FEATURE_CX8) \
CC_SET(e) \
- : CC_OUT(e) (ret), \
- "+a" (o.low), "+d" (o.high) \
+ : ALT_OUTPUT_SP(CC_OUT(e) (ret), \
+ "+a" (o.low), "+d" (o.high)) \
: "b" (n.low), "c" (n.high), [ptr] "S" (_ptr) \
: "memory"); \
\
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