/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ASM_BARRIER_H #define __ASM_BARRIER_H #ifndef __ASSEMBLY__ /* The synchronize caches instruction executes as a nop on systems in which all memory references are performed in order. */ #define synchronize_caches() __asm__ __volatile__ ("sync" : : : "memory") #if defined(CONFIG_SMP) #define mb() do { synchronize_caches(); } while (0) #define rmb() mb() #define wmb() mb() #define dma_rmb() mb() #define dma_wmb() mb() #else #define mb() barrier() #define rmb() barrier() #define wmb() barrier() #define dma_rmb() barrier() #define dma_wmb() barrier() #endif #define __smp_mb() mb() #define __smp_rmb() mb() #define __smp_wmb() mb() #include <asm-generic/barrier.h> #endif /* !__ASSEMBLY__ */ #endif /* __ASM_BARRIER_H */