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/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
#ifndef __LINUX_COMPILER_H
#define __LINUX_COMPILER_H
#define likely(x) __builtin_expect(!!(x), 1)
#define unlikely(x) __builtin_expect(!!(x), 0)
#define READ_ONCE(x) (*(volatile typeof(x) *)&x)
#define WRITE_ONCE(x, v) (*(volatile typeof(x) *)&x) = (v)
#define barrier() asm volatile("" ::: "memory")
#if defined(__x86_64__)
# define smp_rmb() barrier()
# define smp_wmb() barrier()
# define smp_mb() asm volatile("lock; addl $0,-132(%%rsp)" ::: "memory", "cc")
# define smp_store_release(p, v) \
do { \
barrier(); \
WRITE_ONCE(*p, v); \
} while (0)
# define smp_load_acquire(p) \
({ \
typeof(*p) ___p = READ_ONCE(*p); \
barrier(); \
___p; \
})
#elif defined(__aarch64__)
# define smp_rmb() asm volatile("dmb ishld" ::: "memory")
# define smp_wmb() asm volatile("dmb ishst" ::: "memory")
# define smp_mb() asm volatile("dmb ish" ::: "memory")
#endif
#ifndef smp_mb
# define smp_mb() __sync_synchronize()
#endif
#ifndef smp_rmb
# define smp_rmb() smp_mb()
#endif
#ifndef smp_wmb
# define smp_wmb() smp_mb()
#endif
#ifndef smp_store_release
# define smp_store_release(p, v) \
do { \
smp_mb(); \
WRITE_ONCE(*p, v); \
} while (0)
#endif
#ifndef smp_load_acquire
# define smp_load_acquire(p) \
({ \
typeof(*p) ___p = READ_ONCE(*p); \
smp_mb(); \
___p; \
})
#endif
#endif /* __LINUX_COMPILER_H */
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