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Editing: atomic.h
Close
/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright IBM Corp. 1999, 2016 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>, * Denis Joseph Barrow, * Arnd Bergmann, */ #ifndef __ARCH_S390_ATOMIC__ #define __ARCH_S390_ATOMIC__ #include <linux/compiler.h> #include <linux/types.h> #include <asm/atomic_ops.h> #include <asm/barrier.h> #include <asm/cmpxchg.h> #define ATOMIC_INIT(i) { (i) } static inline int atomic_read(const atomic_t *v) { int c; asm volatile( " l %0,%1\n" : "=d" (c) : "Q" (v->counter)); return c; } static inline void atomic_set(atomic_t *v, int i) { asm volatile( " st %1,%0\n" : "=Q" (v->counter) : "d" (i)); } static inline int atomic_add_return(int i, atomic_t *v) { return __atomic_add_barrier(i, &v->counter) + i; } static inline int atomic_fetch_add(int i, atomic_t *v) { return __atomic_add_barrier(i, &v->counter); } static inline void atomic_add(int i, atomic_t *v) { #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES if (__builtin_constant_p(i) && (i > -129) && (i < 128)) { __atomic_add_const(i, &v->counter); return; } #endif __atomic_add(i, &v->counter); } #define atomic_add_negative(_i, _v) (atomic_add_return(_i, _v) < 0) #define atomic_inc(_v) atomic_add(1, _v) #define atomic_inc_return(_v) atomic_add_return(1, _v) #define atomic_inc_and_test(_v) (atomic_add_return(1, _v) == 0) #define atomic_sub(_i, _v) atomic_add(-(int)(_i), _v) #define atomic_sub_return(_i, _v) atomic_add_return(-(int)(_i), _v) #define atomic_fetch_sub(_i, _v) atomic_fetch_add(-(int)(_i), _v) #define atomic_sub_and_test(_i, _v) (atomic_sub_return(_i, _v) == 0) #define atomic_dec(_v) atomic_sub(1, _v) #define atomic_dec_return(_v) atomic_sub_return(1, _v) #define atomic_dec_and_test(_v) (atomic_sub_return(1, _v) == 0) #define ATOMIC_OPS(op) \ static inline void atomic_##op(int i, atomic_t *v) \ { \ __atomic_##op(i, &v->counter); \ } \ static inline int atomic_fetch_##op(int i, atomic_t *v) \ { \ return __atomic_##op##_barrier(i, &v->counter); \ } ATOMIC_OPS(and) ATOMIC_OPS(or) ATOMIC_OPS(xor) #undef ATOMIC_OPS #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) static inline int atomic_cmpxchg(atomic_t *v, int old, int new) { return __atomic_cmpxchg(&v->counter, old, new); } static inline int __atomic_add_unless(atomic_t *v, int a, int u) { int c, old; c = atomic_read(v); for (;;) { if (unlikely(c == u)) break; old = atomic_cmpxchg(v, c, c + a); if (likely(old == c)) break; c = old; } return c; } #define ATOMIC64_INIT(i) { (i) } static inline long atomic64_read(const atomic64_t *v) { long c; asm volatile( " lg %0,%1\n" : "=d" (c) : "Q" (v->counter)); return c; } static inline void atomic64_set(atomic64_t *v, long i) { asm volatile( " stg %1,%0\n" : "=Q" (v->counter) : "d" (i)); } static inline long atomic64_add_return(long i, atomic64_t *v) { return __atomic64_add_barrier(i, &v->counter) + i; } static inline long atomic64_fetch_add(long i, atomic64_t *v) { return __atomic64_add_barrier(i, &v->counter); } static inline void atomic64_add(long i, atomic64_t *v) { #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES if (__builtin_constant_p(i) && (i > -129) && (i < 128)) { __atomic64_add_const(i, &v->counter); return; } #endif __atomic64_add(i, &v->counter); } #define atomic64_xchg(v, new) (xchg(&((v)->counter), new)) static inline long atomic64_cmpxchg(atomic64_t *v, long old, long new) { return __atomic64_cmpxchg(&v->counter, old, new); } #define ATOMIC64_OPS(op) \ static inline void atomic64_##op(long i, atomic64_t *v) \ { \ __atomic64_##op(i, &v->counter); \ } \ static inline long atomic64_fetch_##op(long i, atomic64_t *v) \ { \ return __atomic64_##op##_barrier(i, &v->counter); \ } ATOMIC64_OPS(and) ATOMIC64_OPS(or) ATOMIC64_OPS(xor) #undef ATOMIC64_OPS static inline int atomic64_add_unless(atomic64_t *v, long i, long u) { long c, old; c = atomic64_read(v); for (;;) { if (unlikely(c == u)) break; old = atomic64_cmpxchg(v, c, c + i); if (likely(old == c)) break; c = old; } return c != u; } static inline long atomic64_dec_if_positive(atomic64_t *v) { long c, old, dec; c = atomic64_read(v); for (;;) { dec = c - 1; if (unlikely(dec < 0)) break; old = atomic64_cmpxchg((v), c, dec); if (likely(old == c)) break; c = old; } return dec; } #define atomic64_add_negative(_i, _v) (atomic64_add_return(_i, _v) < 0) #define atomic64_inc(_v) atomic64_add(1, _v) #define atomic64_inc_return(_v) atomic64_add_return(1, _v) #define atomic64_inc_and_test(_v) (atomic64_add_return(1, _v) == 0) #define atomic64_sub_return(_i, _v) atomic64_add_return(-(long)(_i), _v) #define atomic64_fetch_sub(_i, _v) atomic64_fetch_add(-(long)(_i), _v) #define atomic64_sub(_i, _v) atomic64_add(-(long)(_i), _v) #define atomic64_sub_and_test(_i, _v) (atomic64_sub_return(_i, _v) == 0) #define atomic64_dec(_v) atomic64_sub(1, _v) #define atomic64_dec_return(_v) atomic64_sub_return(1, _v) #define atomic64_dec_and_test(_v) (atomic64_sub_return(1, _v) == 0) #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) #endif /* __ARCH_S390_ATOMIC__ */