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- /* SPDX-License-Identifier: GPL-2.0 */
- #if defined(__i386__) || defined(__x86_64__)
- #define barrier() asm volatile("" ::: "memory")
- #define virt_mb() __sync_synchronize()
- #define virt_rmb() barrier()
- #define virt_wmb() barrier()
- /* Atomic store should be enough, but gcc generates worse code in that case. */
- #define virt_store_mb(var, value) do { \
- typeof(var) virt_store_mb_value = (value); \
- __atomic_exchange(&(var), &virt_store_mb_value, &virt_store_mb_value, \
- __ATOMIC_SEQ_CST); \
- barrier(); \
- } while (0);
- /* Weak barriers should be used. If not - it's a bug */
- # define mb() abort()
- # define dma_rmb() abort()
- # define dma_wmb() abort()
- #else
- #error Please fill in barrier macros
- #endif
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