__atomic_acquire_fence 24 arch/alpha/include/asm/atomic.h #define __atomic_acquire_fence() __atomic_acquire_fence 22 arch/powerpc/include/asm/atomic.h #define __atomic_acquire_fence() \ __atomic_acquire_fence 24 arch/riscv/include/asm/atomic.h #define __atomic_acquire_fence() \ __atomic_acquire_fence 37 include/linux/atomic.h #define __atomic_acquire_fence smp_mb__after_atomic