Put the acquisition of the expected value inside the loop to prevent an infinite loop when it does not match.
Signed-off-by: Junru Shen <[email protected]>
---
arch/x86/include/asm/atomic64_64.h | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/atomic64_64.h b/arch/x86/include/asm/atomic64_64.h
index 7886d0578..3df04c44c 100644
--- a/arch/x86/include/asm/atomic64_64.h
+++ b/arch/x86/include/asm/atomic64_64.h
@@ -207,9 +207,10 @@ static inline void arch_atomic64_and(s64 i, atomic64_t *v)
static inline s64 arch_atomic64_fetch_and(s64 i, atomic64_t *v)
{
- s64 val = arch_atomic64_read(v);
+ s64 val;
do {
+ val = arch_atomic64_read(v);
} while (!arch_atomic64_try_cmpxchg(v, &val, val & i));
return val;
}
@@ -225,9 +226,10 @@ static inline void arch_atomic64_or(s64 i, atomic64_t *v)
static inline s64 arch_atomic64_fetch_or(s64 i, atomic64_t *v)
{
- s64 val = arch_atomic64_read(v);
+ s64 val;
do {
+ val = arch_atomic64_read(v);
} while (!arch_atomic64_try_cmpxchg(v, &val, val | i));
return val;
}
@@ -243,9 +245,10 @@ static inline void arch_atomic64_xor(s64 i, atomic64_t *v)
static inline s64 arch_atomic64_fetch_xor(s64 i, atomic64_t *v)
{
- s64 val = arch_atomic64_read(v);
+ s64 val;
do {
+ val = arch_atomic64_read(v);
} while (!arch_atomic64_try_cmpxchg(v, &val, val ^ i));
return val;
}
--
2.30.2