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-rw-r--r--arch/arm64/Kconfig1
-rw-r--r--arch/arm64/include/asm/spinlock.h8
2 files changed, 7 insertions, 2 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index c04454876bcb..9e8233b3f188 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1,6 +1,7 @@
config ARM64
def_bool y
select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
+ select ARCH_USE_CMPXCHG_LOCKREF
select ARCH_WANT_OPTIONAL_GPIOLIB
select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
select ARCH_WANT_FRAME_POINTERS
diff --git a/arch/arm64/include/asm/spinlock.h b/arch/arm64/include/asm/spinlock.h
index 525dd535443e..3d5cf064d7a1 100644
--- a/arch/arm64/include/asm/spinlock.h
+++ b/arch/arm64/include/asm/spinlock.h
@@ -92,10 +92,14 @@ static inline void arch_spin_unlock(arch_spinlock_t *lock)
: "memory");
}
+static inline int arch_spin_value_unlocked(arch_spinlock_t lock)
+{
+ return lock.owner == lock.next;
+}
+
static inline int arch_spin_is_locked(arch_spinlock_t *lock)
{
- arch_spinlock_t lockval = ACCESS_ONCE(*lock);
- return lockval.owner != lockval.next;
+ return !arch_spin_value_unlocked(ACCESS_ONCE(*lock));
}
static inline int arch_spin_is_contended(arch_spinlock_t *lock)