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Diffstat (limited to '')
| -rw-r--r-- | include/linux/atomic.h | 1317 |
1 files changed, 1317 insertions, 0 deletions
diff --git a/include/linux/atomic.h b/include/linux/atomic.h new file mode 100644 index 000000000..1e8e88bda --- /dev/null +++ b/include/linux/atomic.h @@ -0,0 +1,1317 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Atomic operations usable in machine independent code */ +#ifndef _LINUX_ATOMIC_H +#define _LINUX_ATOMIC_H +#include <linux/types.h> + +#include <asm/atomic.h> +#include <asm/barrier.h> + +/* + * Relaxed variants of xchg, cmpxchg and some atomic operations. + * + * We support four variants: + * + * - Fully ordered: The default implementation, no suffix required. + * - Acquire: Provides ACQUIRE semantics, _acquire suffix. + * - Release: Provides RELEASE semantics, _release suffix. + * - Relaxed: No ordering guarantees, _relaxed suffix. + * + * For compound atomics performing both a load and a store, ACQUIRE + * semantics apply only to the load and RELEASE semantics only to the + * store portion of the operation. Note that a failed cmpxchg_acquire + * does -not- imply any memory ordering constraints. + * + * See Documentation/memory-barriers.txt for ACQUIRE/RELEASE definitions. + */ + +#ifndef atomic_read_acquire +#define atomic_read_acquire(v) smp_load_acquire(&(v)->counter) +#endif + +#ifndef atomic_set_release +#define atomic_set_release(v, i) smp_store_release(&(v)->counter, (i)) +#endif + +/* + * The idea here is to build acquire/release variants by adding explicit + * barriers on top of the relaxed variant. In the case where the relaxed + * variant is already fully ordered, no additional barriers are needed. + * + * If an architecture overrides __atomic_acquire_fence() it will probably + * want to define smp_mb__after_spinlock(). + */ +#ifndef __atomic_acquire_fence +#define __atomic_acquire_fence smp_mb__after_atomic +#endif + +#ifndef __atomic_release_fence +#define __atomic_release_fence smp_mb__before_atomic +#endif + +#ifndef __atomic_pre_full_fence +#define __atomic_pre_full_fence smp_mb__before_atomic +#endif + +#ifndef __atomic_post_full_fence +#define __atomic_post_full_fence smp_mb__after_atomic +#endif + +#define __atomic_op_acquire(op, args...) \ +({ \ + typeof(op##_relaxed(args)) __ret = op##_relaxed(args); \ + __atomic_acquire_fence(); \ + __ret; \ +}) + +#define __atomic_op_release(op, args...) \ +({ \ + __atomic_release_fence(); \ + op##_relaxed(args); \ +}) + +#define __atomic_op_fence(op, args...) \ +({ \ + typeof(op##_relaxed(args)) __ret; \ + __atomic_pre_full_fence(); \ + __ret = op##_relaxed(args); \ + __atomic_post_full_fence(); \ + __ret; \ +}) + +/* atomic_add_return_relaxed */ +#ifndef atomic_add_return_relaxed +#define atomic_add_return_relaxed atomic_add_return +#define atomic_add_return_acquire atomic_add_return +#define atomic_add_return_release atomic_add_return + +#else /* atomic_add_return_relaxed */ + +#ifndef atomic_add_return_acquire +#define atomic_add_return_acquire(...) \ + __atomic_op_acquire(atomic_add_return, __VA_ARGS__) +#endif + +#ifndef atomic_add_return_release +#define atomic_add_return_release(...) \ + __atomic_op_release(atomic_add_return, __VA_ARGS__) +#endif + +#ifndef atomic_add_return +#define atomic_add_return(...) \ + __atomic_op_fence(atomic_add_return, __VA_ARGS__) +#endif +#endif /* atomic_add_return_relaxed */ + +#ifndef atomic_inc +#define atomic_inc(v) atomic_add(1, (v)) +#endif + +/* atomic_inc_return_relaxed */ +#ifndef atomic_inc_return_relaxed + +#ifndef atomic_inc_return +#define atomic_inc_return(v) atomic_add_return(1, (v)) +#define atomic_inc_return_relaxed(v) atomic_add_return_relaxed(1, (v)) +#define atomic_inc_return_acquire(v) atomic_add_return_acquire(1, (v)) +#define atomic_inc_return_release(v) atomic_add_return_release(1, (v)) +#else /* atomic_inc_return */ +#define atomic_inc_return_relaxed atomic_inc_return +#define atomic_inc_return_acquire atomic_inc_return +#define atomic_inc_return_release atomic_inc_return +#endif /* atomic_inc_return */ + +#else /* atomic_inc_return_relaxed */ + +#ifndef atomic_inc_return_acquire +#define atomic_inc_return_acquire(...) \ + __atomic_op_acquire(atomic_inc_return, __VA_ARGS__) +#endif + +#ifndef atomic_inc_return_release +#define atomic_inc_return_release(...) \ + __atomic_op_release(atomic_inc_return, __VA_ARGS__) +#endif + +#ifndef atomic_inc_return +#define atomic_inc_return(...) \ + __atomic_op_fence(atomic_inc_return, __VA_ARGS__) +#endif +#endif /* atomic_inc_return_relaxed */ + +/* atomic_sub_return_relaxed */ +#ifndef atomic_sub_return_relaxed +#define atomic_sub_return_relaxed atomic_sub_return +#define atomic_sub_return_acquire atomic_sub_return +#define atomic_sub_return_release atomic_sub_return + +#else /* atomic_sub_return_relaxed */ + +#ifndef atomic_sub_return_acquire +#define atomic_sub_return_acquire(...) \ + __atomic_op_acquire(atomic_sub_return, __VA_ARGS__) +#endif + +#ifndef atomic_sub_return_release +#define atomic_sub_return_release(...) \ + __atomic_op_release(atomic_sub_return, __VA_ARGS__) +#endif + +#ifndef atomic_sub_return +#define atomic_sub_return(...) \ + __atomic_op_fence(atomic_sub_return, __VA_ARGS__) +#endif +#endif /* atomic_sub_return_relaxed */ + +#ifndef atomic_dec +#define atomic_dec(v) atomic_sub(1, (v)) +#endif + +/* atomic_dec_return_relaxed */ +#ifndef atomic_dec_return_relaxed + +#ifndef atomic_dec_return +#define atomic_dec_return(v) atomic_sub_return(1, (v)) +#define atomic_dec_return_relaxed(v) atomic_sub_return_relaxed(1, (v)) +#define atomic_dec_return_acquire(v) atomic_sub_return_acquire(1, (v)) +#define atomic_dec_return_release(v) atomic_sub_return_release(1, (v)) +#else /* atomic_dec_return */ +#define atomic_dec_return_relaxed atomic_dec_return +#define atomic_dec_return_acquire atomic_dec_return +#define atomic_dec_return_release atomic_dec_return +#endif /* atomic_dec_return */ + +#else /* atomic_dec_return_relaxed */ + +#ifndef atomic_dec_return_acquire +#define atomic_dec_return_acquire(...) \ + __atomic_op_acquire(atomic_dec_return, __VA_ARGS__) +#endif + +#ifndef atomic_dec_return_release +#define atomic_dec_return_release(...) \ + __atomic_op_release(atomic_dec_return, __VA_ARGS__) +#endif + +#ifndef atomic_dec_return +#define atomic_dec_return(...) \ + __atomic_op_fence(atomic_dec_return, __VA_ARGS__) +#endif +#endif /* atomic_dec_return_relaxed */ + + +/* atomic_fetch_add_relaxed */ +#ifndef atomic_fetch_add_relaxed +#define atomic_fetch_add_relaxed atomic_fetch_add +#define atomic_fetch_add_acquire atomic_fetch_add +#define atomic_fetch_add_release atomic_fetch_add + +#else /* atomic_fetch_add_relaxed */ + +#ifndef atomic_fetch_add_acquire +#define atomic_fetch_add_acquire(...) \ + __atomic_op_acquire(atomic_fetch_add, __VA_ARGS__) +#endif + +#ifndef atomic_fetch_add_release +#define atomic_fetch_add_release(...) \ + __atomic_op_release(atomic_fetch_add, __VA_ARGS__) +#endif + +#ifndef atomic_fetch_add +#define atomic_fetch_add(...) \ + __atomic_op_fence(atomic_fetch_add, __VA_ARGS__) +#endif +#endif /* atomic_fetch_add_relaxed */ + +/* atomic_fetch_inc_relaxed */ +#ifndef atomic_fetch_inc_relaxed + +#ifndef atomic_fetch_inc +#define atomic_fetch_inc(v) atomic_fetch_add(1, (v)) +#define atomic_fetch_inc_relaxed(v) atomic_fetch_add_relaxed(1, (v)) +#define atomic_fetch_inc_acquire(v) atomic_fetch_add_acquire(1, (v)) +#define atomic_fetch_inc_release(v) atomic_fetch_add_release(1, (v)) +#else /* atomic_fetch_inc */ +#define atomic_fetch_inc_relaxed atomic_fetch_inc +#define atomic_fetch_inc_acquire atomic_fetch_inc +#define atomic_fetch_inc_release atomic_fetch_inc +#endif /* atomic_fetch_inc */ + +#else /* atomic_fetch_inc_relaxed */ + +#ifndef atomic_fetch_inc_acquire +#define atomic_fetch_inc_acquire(...) \ + __atomic_op_acquire(atomic_fetch_inc, __VA_ARGS__) +#endif + +#ifndef atomic_fetch_inc_release +#define atomic_fetch_inc_release(...) \ + __atomic_op_release(atomic_fetch_inc, __VA_ARGS__) +#endif + +#ifndef atomic_fetch_inc +#define atomic_fetch_inc(...) \ + __atomic_op_fence(atomic_fetch_inc, __VA_ARGS__) +#endif +#endif /* atomic_fetch_inc_relaxed */ + +/* atomic_fetch_sub_relaxed */ +#ifndef atomic_fetch_sub_relaxed +#define atomic_fetch_sub_relaxed atomic_fetch_sub +#define atomic_fetch_sub_acquire atomic_fetch_sub +#define atomic_fetch_sub_release atomic_fetch_sub + +#else /* atomic_fetch_sub_relaxed */ + +#ifndef atomic_fetch_sub_acquire +#define atomic_fetch_sub_acquire(...) \ + __atomic_op_acquire(atomic_fetch_sub, __VA_ARGS__) +#endif + +#ifndef atomic_fetch_sub_release +#define atomic_fetch_sub_release(...) \ + __atomic_op_release(atomic_fetch_sub, __VA_ARGS__) +#endif + +#ifndef atomic_fetch_sub +#define atomic_fetch_sub(...) \ + __atomic_op_fence(atomic_fetch_sub, __VA_ARGS__) +#endif +#endif /* atomic_fetch_sub_relaxed */ + +/* atomic_fetch_dec_relaxed */ +#ifndef atomic_fetch_dec_relaxed + +#ifndef atomic_fetch_dec +#define atomic_fetch_dec(v) atomic_fetch_sub(1, (v)) +#define atomic_fetch_dec_relaxed(v) atomic_fetch_sub_relaxed(1, (v)) +#define atomic_fetch_dec_acquire(v) atomic_fetch_sub_acquire(1, (v)) +#define atomic_fetch_dec_release(v) atomic_fetch_sub_release(1, (v)) +#else /* atomic_fetch_dec */ +#define atomic_fetch_dec_relaxed atomic_fetch_dec +#define atomic_fetch_dec_acquire atomic_fetch_dec +#define atomic_fetch_dec_release atomic_fetch_dec +#endif /* atomic_fetch_dec */ + +#else /* atomic_fetch_dec_relaxed */ + +#ifndef atomic_fetch_dec_acquire +#define atomic_fetch_dec_acquire(...) \ + __atomic_op_acquire(atomic_fetch_dec, __VA_ARGS__) +#endif + +#ifndef atomic_fetch_dec_release +#define atomic_fetch_dec_release(...) \ + __atomic_op_release(atomic_fetch_dec, __VA_ARGS__) +#endif + +#ifndef atomic_fetch_dec +#define atomic_fetch_dec(...) \ + __atomic_op_fence(atomic_fetch_dec, __VA_ARGS__) +#endif +#endif /* atomic_fetch_dec_relaxed */ + +/* atomic_fetch_or_relaxed */ +#ifndef atomic_fetch_or_relaxed +#define atomic_fetch_or_relaxed atomic_fetch_or +#define atomic_fetch_or_acquire atomic_fetch_or +#define atomic_fetch_or_release atomic_fetch_or + +#else /* atomic_fetch_or_relaxed */ + +#ifndef atomic_fetch_or_acquire +#define atomic_fetch_or_acquire(...) \ + __atomic_op_acquire(atomic_fetch_or, __VA_ARGS__) +#endif + +#ifndef atomic_fetch_or_release +#define atomic_fetch_or_release(...) \ + __atomic_op_release(atomic_fetch_or, __VA_ARGS__) +#endif + +#ifndef atomic_fetch_or +#define atomic_fetch_or(...) \ + __atomic_op_fence(atomic_fetch_or, __VA_ARGS__) +#endif +#endif /* atomic_fetch_or_relaxed */ + +/* atomic_fetch_and_relaxed */ +#ifndef atomic_fetch_and_relaxed +#define atomic_fetch_and_relaxed atomic_fetch_and +#define atomic_fetch_and_acquire atomic_fetch_and +#define atomic_fetch_and_release atomic_fetch_and + +#else /* atomic_fetch_and_relaxed */ + +#ifndef atomic_fetch_and_acquire +#define atomic_fetch_and_acquire(...) \ + __atomic_op_acquire(atomic_fetch_and, __VA_ARGS__) +#endif + +#ifndef atomic_fetch_and_release +#define atomic_fetch_and_release(...) \ + __atomic_op_release(atomic_fetch_and, __VA_ARGS__) +#endif + +#ifndef atomic_fetch_and +#define atomic_fetch_and(...) \ + __atomic_op_fence(atomic_fetch_and, __VA_ARGS__) +#endif +#endif /* atomic_fetch_and_relaxed */ + +#ifndef atomic_andnot +#define atomic_andnot(i, v) atomic_and(~(int)(i), (v)) +#endif + +#ifndef atomic_fetch_andnot_relaxed + +#ifndef atomic_fetch_andnot +#define atomic_fetch_andnot(i, v) atomic_fetch_and(~(int)(i), (v)) +#define atomic_fetch_andnot_relaxed(i, v) atomic_fetch_and_relaxed(~(int)(i), (v)) +#define atomic_fetch_andnot_acquire(i, v) atomic_fetch_and_acquire(~(int)(i), (v)) +#define atomic_fetch_andnot_release(i, v) atomic_fetch_and_release(~(int)(i), (v)) +#else /* atomic_fetch_andnot */ +#define atomic_fetch_andnot_relaxed atomic_fetch_andnot +#define atomic_fetch_andnot_acquire atomic_fetch_andnot +#define atomic_fetch_andnot_release atomic_fetch_andnot +#endif /* atomic_fetch_andnot */ + +#else /* atomic_fetch_andnot_relaxed */ + +#ifndef atomic_fetch_andnot_acquire +#define atomic_fetch_andnot_acquire(...) \ + __atomic_op_acquire(atomic_fetch_andnot, __VA_ARGS__) +#endif + +#ifndef atomic_fetch_andnot_release +#define atomic_fetch_andnot_release(...) \ + __atomic_op_release(atomic_fetch_andnot, __VA_ARGS__) +#endif + +#ifndef atomic_fetch_andnot +#define atomic_fetch_andnot(...) \ + __atomic_op_fence(atomic_fetch_andnot, __VA_ARGS__) +#endif +#endif /* atomic_fetch_andnot_relaxed */ + +/* atomic_fetch_xor_relaxed */ +#ifndef atomic_fetch_xor_relaxed +#define atomic_fetch_xor_relaxed atomic_fetch_xor +#define atomic_fetch_xor_acquire atomic_fetch_xor +#define atomic_fetch_xor_release atomic_fetch_xor + +#else /* atomic_fetch_xor_relaxed */ + +#ifndef atomic_fetch_xor_acquire +#define atomic_fetch_xor_acquire(...) \ + __atomic_op_acquire(atomic_fetch_xor, __VA_ARGS__) +#endif + +#ifndef atomic_fetch_xor_release +#define atomic_fetch_xor_release(...) \ + __atomic_op_release(atomic_fetch_xor, __VA_ARGS__) +#endif + +#ifndef atomic_fetch_xor +#define atomic_fetch_xor(...) \ + __atomic_op_fence(atomic_fetch_xor, __VA_ARGS__) +#endif +#endif /* atomic_fetch_xor_relaxed */ + + +/* atomic_xchg_relaxed */ +#ifndef atomic_xchg_relaxed +#define atomic_xchg_relaxed atomic_xchg +#define atomic_xchg_acquire atomic_xchg +#define atomic_xchg_release atomic_xchg + +#else /* atomic_xchg_relaxed */ + +#ifndef atomic_xchg_acquire +#define atomic_xchg_acquire(...) \ + __atomic_op_acquire(atomic_xchg, __VA_ARGS__) +#endif + +#ifndef atomic_xchg_release +#define atomic_xchg_release(...) \ + __atomic_op_release(atomic_xchg, __VA_ARGS__) +#endif + +#ifndef atomic_xchg +#define atomic_xchg(...) \ + __atomic_op_fence(atomic_xchg, __VA_ARGS__) +#endif +#endif /* atomic_xchg_relaxed */ + +/* atomic_cmpxchg_relaxed */ +#ifndef atomic_cmpxchg_relaxed +#define atomic_cmpxchg_relaxed atomic_cmpxchg +#define atomic_cmpxchg_acquire atomic_cmpxchg +#define atomic_cmpxchg_release atomic_cmpxchg + +#else /* atomic_cmpxchg_relaxed */ + +#ifndef atomic_cmpxchg_acquire +#define atomic_cmpxchg_acquire(...) \ + __atomic_op_acquire(atomic_cmpxchg, __VA_ARGS__) +#endif + +#ifndef atomic_cmpxchg_release +#define atomic_cmpxchg_release(...) \ + __atomic_op_release(atomic_cmpxchg, __VA_ARGS__) +#endif + +#ifndef atomic_cmpxchg +#define atomic_cmpxchg(...) \ + __atomic_op_fence(atomic_cmpxchg, __VA_ARGS__) +#endif +#endif /* atomic_cmpxchg_relaxed */ + +#ifndef atomic_try_cmpxchg + +#define __atomic_try_cmpxchg(type, _p, _po, _n) \ +({ \ + typeof(_po) __po = (_po); \ + typeof(*(_po)) __r, __o = *__po; \ + __r = atomic_cmpxchg##type((_p), __o, (_n)); \ + if (unlikely(__r != __o)) \ + *__po = __r; \ + likely(__r == __o); \ +}) + +#define atomic_try_cmpxchg(_p, _po, _n) __atomic_try_cmpxchg(, _p, _po, _n) +#define atomic_try_cmpxchg_relaxed(_p, _po, _n) __atomic_try_cmpxchg(_relaxed, _p, _po, _n) +#define atomic_try_cmpxchg_acquire(_p, _po, _n) __atomic_try_cmpxchg(_acquire, _p, _po, _n) +#define atomic_try_cmpxchg_release(_p, _po, _n) __atomic_try_cmpxchg(_release, _p, _po, _n) + +#else /* atomic_try_cmpxchg */ +#define atomic_try_cmpxchg_relaxed atomic_try_cmpxchg +#define atomic_try_cmpxchg_acquire atomic_try_cmpxchg +#define atomic_try_cmpxchg_release atomic_try_cmpxchg +#endif /* atomic_try_cmpxchg */ + +/* cmpxchg_relaxed */ +#ifndef cmpxchg_relaxed +#define cmpxchg_relaxed cmpxchg +#define cmpxchg_acquire cmpxchg +#define cmpxchg_release cmpxchg + +#else /* cmpxchg_relaxed */ + +#ifndef cmpxchg_acquire +#define cmpxchg_acquire(...) \ + __atomic_op_acquire(cmpxchg, __VA_ARGS__) +#endif + +#ifndef cmpxchg_release +#define cmpxchg_release(...) \ + __atomic_op_release(cmpxchg, __VA_ARGS__) +#endif + +#ifndef cmpxchg +#define cmpxchg(...) \ + __atomic_op_fence(cmpxchg, __VA_ARGS__) +#endif +#endif /* cmpxchg_relaxed */ + +/* cmpxchg64_relaxed */ +#ifndef cmpxchg64_relaxed +#define cmpxchg64_relaxed cmpxchg64 +#define cmpxchg64_acquire cmpxchg64 +#define cmpxchg64_release cmpxchg64 + +#else /* cmpxchg64_relaxed */ + +#ifndef cmpxchg64_acquire +#define cmpxchg64_acquire(...) \ + __atomic_op_acquire(cmpxchg64, __VA_ARGS__) +#endif + +#ifndef cmpxchg64_release +#define cmpxchg64_release(...) \ + __atomic_op_release(cmpxchg64, __VA_ARGS__) +#endif + +#ifndef cmpxchg64 +#define cmpxchg64(...) \ + __atomic_op_fence(cmpxchg64, __VA_ARGS__) +#endif +#endif /* cmpxchg64_relaxed */ + +/* xchg_relaxed */ +#ifndef xchg_relaxed +#define xchg_relaxed xchg +#define xchg_acquire xchg +#define xchg_release xchg + +#else /* xchg_relaxed */ + +#ifndef xchg_acquire +#define xchg_acquire(...) __atomic_op_acquire(xchg, __VA_ARGS__) +#endif + +#ifndef xchg_release +#define xchg_release(...) __atomic_op_release(xchg, __VA_ARGS__) +#endif + +#ifndef xchg +#define xchg(...) __atomic_op_fence(xchg, __VA_ARGS__) +#endif +#endif /* xchg_relaxed */ + +/** + * atomic_fetch_add_unless - add unless the number is already a given value + * @v: pointer of type atomic_t + * @a: the amount to add to v... + * @u: ...unless v is equal to u. + * + * Atomically adds @a to @v, if @v was not already @u. + * Returns the original value of @v. + */ +#ifndef atomic_fetch_add_unless +static inline int atomic_fetch_add_unless(atomic_t *v, int a, int u) +{ + int c = atomic_read(v); + + do { + if (unlikely(c == u)) + break; + } while (!atomic_try_cmpxchg(v, &c, c + a)); + + return c; +} +#endif + +/** + * atomic_add_unless - add unless the number is already a given value + * @v: pointer of type atomic_t + * @a: the amount to add to v... + * @u: ...unless v is equal to u. + * + * Atomically adds @a to @v, if @v was not already @u. + * Returns true if the addition was done. + */ +static inline bool atomic_add_unless(atomic_t *v, int a, int u) +{ + return atomic_fetch_add_unless(v, a, u) != u; +} + +/** + * atomic_inc_not_zero - increment unless the number is zero + * @v: pointer of type atomic_t + * + * Atomically increments @v by 1, if @v is non-zero. + * Returns true if the increment was done. + */ +#ifndef atomic_inc_not_zero +#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) +#endif + +/** + * atomic_inc_and_test - increment and test + * @v: pointer of type atomic_t + * + * Atomically increments @v by 1 + * and returns true if the result is zero, or false for all + * other cases. + */ +#ifndef atomic_inc_and_test +static inline bool atomic_inc_and_test(atomic_t *v) +{ + return atomic_inc_return(v) == 0; +} +#endif + +/** + * atomic_dec_and_test - decrement and test + * @v: pointer of type atomic_t + * + * Atomically decrements @v by 1 and + * returns true if the result is 0, or false for all other + * cases. + */ +#ifndef atomic_dec_and_test +static inline bool atomic_dec_and_test(atomic_t *v) +{ + return atomic_dec_return(v) == 0; +} +#endif + +/** + * atomic_sub_and_test - subtract value from variable and test result + * @i: integer value to subtract + * @v: pointer of type atomic_t + * + * Atomically subtracts @i from @v and returns + * true if the result is zero, or false for all + * other cases. + */ +#ifndef atomic_sub_and_test +static inline bool atomic_sub_and_test(int i, atomic_t *v) +{ + return atomic_sub_return(i, v) == 0; +} +#endif + +/** + * atomic_add_negative - add and test if negative + * @i: integer value to add + * @v: pointer of type atomic_t + * + * Atomically adds @i to @v and returns true + * if the result is negative, or false when + * result is greater than or equal to zero. + */ +#ifndef atomic_add_negative +static inline bool atomic_add_negative(int i, atomic_t *v) +{ + return atomic_add_return(i, v) < 0; +} +#endif + +#ifndef atomic_inc_unless_negative +static inline bool atomic_inc_unless_negative(atomic_t *v) +{ + int c = atomic_read(v); + + do { + if (unlikely(c < 0)) + return false; + } while (!atomic_try_cmpxchg(v, &c, c + 1)); + + return true; +} +#endif + +#ifndef atomic_dec_unless_positive +static inline bool atomic_dec_unless_positive(atomic_t *v) +{ + int c = atomic_read(v); + + do { + if (unlikely(c > 0)) + return false; + } while (!atomic_try_cmpxchg(v, &c, c - 1)); + + return true; +} +#endif + +/* + * atomic_dec_if_positive - decrement by 1 if old value positive + * @v: pointer of type atomic_t + * + * The function returns the old value of *v minus 1, even if + * the atomic variable, v, was not decremented. + */ +#ifndef atomic_dec_if_positive +static inline int atomic_dec_if_positive(atomic_t *v) +{ + int dec, c = atomic_read(v); + + do { + dec = c - 1; + if (unlikely(dec < 0)) + break; + } while (!atomic_try_cmpxchg(v, &c, dec)); + + return dec; +} +#endif + +#define atomic_cond_read_relaxed(v, c) smp_cond_load_relaxed(&(v)->counter, (c)) +#define atomic_cond_read_acquire(v, c) smp_cond_load_acquire(&(v)->counter, (c)) + +#ifdef CONFIG_GENERIC_ATOMIC64 +#include <asm-generic/atomic64.h> +#endif + +#ifndef atomic64_read_acquire +#define atomic64_read_acquire(v) smp_load_acquire(&(v)->counter) +#endif + +#ifndef atomic64_set_release +#define atomic64_set_release(v, i) smp_store_release(&(v)->counter, (i)) +#endif + +/* atomic64_add_return_relaxed */ +#ifndef atomic64_add_return_relaxed +#define atomic64_add_return_relaxed atomic64_add_return +#define atomic64_add_return_acquire atomic64_add_return +#define atomic64_add_return_release atomic64_add_return + +#else /* atomic64_add_return_relaxed */ + +#ifndef atomic64_add_return_acquire +#define atomic64_add_return_acquire(...) \ + __atomic_op_acquire(atomic64_add_return, __VA_ARGS__) +#endif + +#ifndef atomic64_add_return_release +#define atomic64_add_return_release(...) \ + __atomic_op_release(atomic64_add_return, __VA_ARGS__) +#endif + +#ifndef atomic64_add_return +#define atomic64_add_return(...) \ + __atomic_op_fence(atomic64_add_return, __VA_ARGS__) +#endif +#endif /* atomic64_add_return_relaxed */ + +#ifndef atomic64_inc +#define atomic64_inc(v) atomic64_add(1, (v)) +#endif + +/* atomic64_inc_return_relaxed */ +#ifndef atomic64_inc_return_relaxed + +#ifndef atomic64_inc_return +#define atomic64_inc_return(v) atomic64_add_return(1, (v)) +#define atomic64_inc_return_relaxed(v) atomic64_add_return_relaxed(1, (v)) +#define atomic64_inc_return_acquire(v) atomic64_add_return_acquire(1, (v)) +#define atomic64_inc_return_release(v) atomic64_add_return_release(1, (v)) +#else /* atomic64_inc_return */ +#define atomic64_inc_return_relaxed atomic64_inc_return +#define atomic64_inc_return_acquire atomic64_inc_return +#define atomic64_inc_return_release atomic64_inc_return +#endif /* atomic64_inc_return */ + +#else /* atomic64_inc_return_relaxed */ + +#ifndef atomic64_inc_return_acquire +#define atomic64_inc_return_acquire(...) \ + __atomic_op_acquire(atomic64_inc_return, __VA_ARGS__) +#endif + +#ifndef atomic64_inc_return_release +#define atomic64_inc_return_release(...) \ + __atomic_op_release(atomic64_inc_return, __VA_ARGS__) +#endif + +#ifndef atomic64_inc_return +#define atomic64_inc_return(...) \ + __atomic_op_fence(atomic64_inc_return, __VA_ARGS__) +#endif +#endif /* atomic64_inc_return_relaxed */ + + +/* atomic64_sub_return_relaxed */ +#ifndef atomic64_sub_return_relaxed +#define atomic64_sub_return_relaxed atomic64_sub_return +#define atomic64_sub_return_acquire atomic64_sub_return +#define atomic64_sub_return_release atomic64_sub_return + +#else /* atomic64_sub_return_relaxed */ + +#ifndef atomic64_sub_return_acquire +#define atomic64_sub_return_acquire(...) \ + __atomic_op_acquire(atomic64_sub_return, __VA_ARGS__) +#endif + +#ifndef atomic64_sub_return_release +#define atomic64_sub_return_release(...) \ + __atomic_op_release(atomic64_sub_return, __VA_ARGS__) +#endif + +#ifndef atomic64_sub_return +#define atomic64_sub_return(...) \ + __atomic_op_fence(atomic64_sub_return, __VA_ARGS__) +#endif +#endif /* atomic64_sub_return_relaxed */ + +#ifndef atomic64_dec +#define atomic64_dec(v) atomic64_sub(1, (v)) +#endif + +/* atomic64_dec_return_relaxed */ +#ifndef atomic64_dec_return_relaxed + +#ifndef atomic64_dec_return +#define atomic64_dec_return(v) atomic64_sub_return(1, (v)) +#define atomic64_dec_return_relaxed(v) atomic64_sub_return_relaxed(1, (v)) +#define atomic64_dec_return_acquire(v) atomic64_sub_return_acquire(1, (v)) +#define atomic64_dec_return_release(v) atomic64_sub_return_release(1, (v)) +#else /* atomic64_dec_return */ +#define atomic64_dec_return_relaxed atomic64_dec_return +#define atomic64_dec_return_acquire atomic64_dec_return +#define atomic64_dec_return_release atomic64_dec_return +#endif /* atomic64_dec_return */ + +#else /* atomic64_dec_return_relaxed */ + +#ifndef atomic64_dec_return_acquire +#define atomic64_dec_return_acquire(...) \ + __atomic_op_acquire(atomic64_dec_return, __VA_ARGS__) +#endif + +#ifndef atomic64_dec_return_release +#define atomic64_dec_return_release(...) \ + __atomic_op_release(atomic64_dec_return, __VA_ARGS__) +#endif + +#ifndef atomic64_dec_return +#define atomic64_dec_return(...) \ + __atomic_op_fence(atomic64_dec_return, __VA_ARGS__) +#endif +#endif /* atomic64_dec_return_relaxed */ + + +/* atomic64_fetch_add_relaxed */ +#ifndef atomic64_fetch_add_relaxed +#define atomic64_fetch_add_relaxed atomic64_fetch_add +#define atomic64_fetch_add_acquire atomic64_fetch_add +#define atomic64_fetch_add_release atomic64_fetch_add + +#else /* atomic64_fetch_add_relaxed */ + +#ifndef atomic64_fetch_add_acquire +#define atomic64_fetch_add_acquire(...) \ + __atomic_op_acquire(atomic64_fetch_add, __VA_ARGS__) +#endif + +#ifndef atomic64_fetch_add_release +#define atomic64_fetch_add_release(...) \ + __atomic_op_release(atomic64_fetch_add, __VA_ARGS__) +#endif + +#ifndef atomic64_fetch_add +#define atomic64_fetch_add(...) \ + __atomic_op_fence(atomic64_fetch_add, __VA_ARGS__) +#endif +#endif /* atomic64_fetch_add_relaxed */ + +/* atomic64_fetch_inc_relaxed */ +#ifndef atomic64_fetch_inc_relaxed + +#ifndef atomic64_fetch_inc +#define atomic64_fetch_inc(v) atomic64_fetch_add(1, (v)) +#define atomic64_fetch_inc_relaxed(v) atomic64_fetch_add_relaxed(1, (v)) +#define atomic64_fetch_inc_acquire(v) atomic64_fetch_add_acquire(1, (v)) +#define atomic64_fetch_inc_release(v) atomic64_fetch_add_release(1, (v)) +#else /* atomic64_fetch_inc */ +#define atomic64_fetch_inc_relaxed atomic64_fetch_inc +#define atomic64_fetch_inc_acquire atomic64_fetch_inc +#define atomic64_fetch_inc_release atomic64_fetch_inc +#endif /* atomic64_fetch_inc */ + +#else /* atomic64_fetch_inc_relaxed */ + +#ifndef atomic64_fetch_inc_acquire +#define atomic64_fetch_inc_acquire(...) \ + __atomic_op_acquire(atomic64_fetch_inc, __VA_ARGS__) +#endif + +#ifndef atomic64_fetch_inc_release +#define atomic64_fetch_inc_release(...) \ + __atomic_op_release(atomic64_fetch_inc, __VA_ARGS__) +#endif + +#ifndef atomic64_fetch_inc +#define atomic64_fetch_inc(...) \ + __atomic_op_fence(atomic64_fetch_inc, __VA_ARGS__) +#endif +#endif /* atomic64_fetch_inc_relaxed */ + +/* atomic64_fetch_sub_relaxed */ +#ifndef atomic64_fetch_sub_relaxed +#define atomic64_fetch_sub_relaxed atomic64_fetch_sub +#define atomic64_fetch_sub_acquire atomic64_fetch_sub +#define atomic64_fetch_sub_release atomic64_fetch_sub + +#else /* atomic64_fetch_sub_relaxed */ + +#ifndef atomic64_fetch_sub_acquire +#define atomic64_fetch_sub_acquire(...) \ + __atomic_op_acquire(atomic64_fetch_sub, __VA_ARGS__) +#endif + +#ifndef atomic64_fetch_sub_release +#define atomic64_fetch_sub_release(...) \ + __atomic_op_release(atomic64_fetch_sub, __VA_ARGS__) +#endif + +#ifndef atomic64_fetch_sub +#define atomic64_fetch_sub(...) \ + __atomic_op_fence(atomic64_fetch_sub, __VA_ARGS__) +#endif +#endif /* atomic64_fetch_sub_relaxed */ + +/* atomic64_fetch_dec_relaxed */ +#ifndef atomic64_fetch_dec_relaxed + +#ifndef atomic64_fetch_dec +#define atomic64_fetch_dec(v) atomic64_fetch_sub(1, (v)) +#define atomic64_fetch_dec_relaxed(v) atomic64_fetch_sub_relaxed(1, (v)) +#define atomic64_fetch_dec_acquire(v) atomic64_fetch_sub_acquire(1, (v)) +#define atomic64_fetch_dec_release(v) atomic64_fetch_sub_release(1, (v)) +#else /* atomic64_fetch_dec */ +#define atomic64_fetch_dec_relaxed atomic64_fetch_dec +#define atomic64_fetch_dec_acquire atomic64_fetch_dec +#define atomic64_fetch_dec_release atomic64_fetch_dec +#endif /* atomic64_fetch_dec */ + +#else /* atomic64_fetch_dec_relaxed */ + +#ifndef atomic64_fetch_dec_acquire +#define atomic64_fetch_dec_acquire(...) \ + __atomic_op_acquire(atomic64_fetch_dec, __VA_ARGS__) +#endif + +#ifndef atomic64_fetch_dec_release +#define atomic64_fetch_dec_release(...) \ + __atomic_op_release(atomic64_fetch_dec, __VA_ARGS__) +#endif + +#ifndef atomic64_fetch_dec +#define atomic64_fetch_dec(...) \ + __atomic_op_fence(atomic64_fetch_dec, __VA_ARGS__) +#endif +#endif /* atomic64_fetch_dec_relaxed */ + +/* atomic64_fetch_or_relaxed */ +#ifndef atomic64_fetch_or_relaxed +#define atomic64_fetch_or_relaxed atomic64_fetch_or +#define atomic64_fetch_or_acquire atomic64_fetch_or +#define atomic64_fetch_or_release atomic64_fetch_or + +#else /* atomic64_fetch_or_relaxed */ + +#ifndef atomic64_fetch_or_acquire +#define atomic64_fetch_or_acquire(...) \ + __atomic_op_acquire(atomic64_fetch_or, __VA_ARGS__) +#endif + +#ifndef atomic64_fetch_or_release +#define atomic64_fetch_or_release(...) \ + __atomic_op_release(atomic64_fetch_or, __VA_ARGS__) +#endif + +#ifndef atomic64_fetch_or +#define atomic64_fetch_or(...) \ + __atomic_op_fence(atomic64_fetch_or, __VA_ARGS__) +#endif +#endif /* atomic64_fetch_or_relaxed */ + +/* atomic64_fetch_and_relaxed */ +#ifndef atomic64_fetch_and_relaxed +#define atomic64_fetch_and_relaxed atomic64_fetch_and +#define atomic64_fetch_and_acquire atomic64_fetch_and +#define atomic64_fetch_and_release atomic64_fetch_and + +#else /* atomic64_fetch_and_relaxed */ + +#ifndef atomic64_fetch_and_acquire +#define atomic64_fetch_and_acquire(...) \ + __atomic_op_acquire(atomic64_fetch_and, __VA_ARGS__) +#endif + +#ifndef atomic64_fetch_and_release +#define atomic64_fetch_and_release(...) \ + __atomic_op_release(atomic64_fetch_and, __VA_ARGS__) +#endif + +#ifndef atomic64_fetch_and +#define atomic64_fetch_and(...) \ + __atomic_op_fence(atomic64_fetch_and, __VA_ARGS__) +#endif +#endif /* atomic64_fetch_and_relaxed */ + +#ifndef atomic64_andnot +#define atomic64_andnot(i, v) atomic64_and(~(long long)(i), (v)) +#endif + +#ifndef atomic64_fetch_andnot_relaxed + +#ifndef atomic64_fetch_andnot +#define atomic64_fetch_andnot(i, v) atomic64_fetch_and(~(long long)(i), (v)) +#define atomic64_fetch_andnot_relaxed(i, v) atomic64_fetch_and_relaxed(~(long long)(i), (v)) +#define atomic64_fetch_andnot_acquire(i, v) atomic64_fetch_and_acquire(~(long long)(i), (v)) +#define atomic64_fetch_andnot_release(i, v) atomic64_fetch_and_release(~(long long)(i), (v)) +#else /* atomic64_fetch_andnot */ +#define atomic64_fetch_andnot_relaxed atomic64_fetch_andnot +#define atomic64_fetch_andnot_acquire atomic64_fetch_andnot +#define atomic64_fetch_andnot_release atomic64_fetch_andnot +#endif /* atomic64_fetch_andnot */ + +#else /* atomic64_fetch_andnot_relaxed */ + +#ifndef atomic64_fetch_andnot_acquire +#define atomic64_fetch_andnot_acquire(...) \ + __atomic_op_acquire(atomic64_fetch_andnot, __VA_ARGS__) +#endif + +#ifndef atomic64_fetch_andnot_release +#define atomic64_fetch_andnot_release(...) \ + __atomic_op_release(atomic64_fetch_andnot, __VA_ARGS__) +#endif + +#ifndef atomic64_fetch_andnot +#define atomic64_fetch_andnot(...) \ + __atomic_op_fence(atomic64_fetch_andnot, __VA_ARGS__) +#endif +#endif /* atomic64_fetch_andnot_relaxed */ + +/* atomic64_fetch_xor_relaxed */ +#ifndef atomic64_fetch_xor_relaxed +#define atomic64_fetch_xor_relaxed atomic64_fetch_xor +#define atomic64_fetch_xor_acquire atomic64_fetch_xor +#define atomic64_fetch_xor_release atomic64_fetch_xor + +#else /* atomic64_fetch_xor_relaxed */ + +#ifndef atomic64_fetch_xor_acquire +#define atomic64_fetch_xor_acquire(...) \ + __atomic_op_acquire(atomic64_fetch_xor, __VA_ARGS__) +#endif + +#ifndef atomic64_fetch_xor_release +#define atomic64_fetch_xor_release(...) \ + __atomic_op_release(atomic64_fetch_xor, __VA_ARGS__) +#endif + +#ifndef atomic64_fetch_xor +#define atomic64_fetch_xor(...) \ + __atomic_op_fence(atomic64_fetch_xor, __VA_ARGS__) +#endif +#endif /* atomic64_fetch_xor_relaxed */ + + +/* atomic64_xchg_relaxed */ +#ifndef atomic64_xchg_relaxed +#define atomic64_xchg_relaxed atomic64_xchg +#define atomic64_xchg_acquire atomic64_xchg +#define atomic64_xchg_release atomic64_xchg + +#else /* atomic64_xchg_relaxed */ + +#ifndef atomic64_xchg_acquire +#define atomic64_xchg_acquire(...) \ + __atomic_op_acquire(atomic64_xchg, __VA_ARGS__) +#endif + +#ifndef atomic64_xchg_release +#define atomic64_xchg_release(...) \ + __atomic_op_release(atomic64_xchg, __VA_ARGS__) +#endif + +#ifndef atomic64_xchg +#define atomic64_xchg(...) \ + __atomic_op_fence(atomic64_xchg, __VA_ARGS__) +#endif +#endif /* atomic64_xchg_relaxed */ + +/* atomic64_cmpxchg_relaxed */ +#ifndef atomic64_cmpxchg_relaxed +#define atomic64_cmpxchg_relaxed atomic64_cmpxchg +#define atomic64_cmpxchg_acquire atomic64_cmpxchg +#define atomic64_cmpxchg_release atomic64_cmpxchg + +#else /* atomic64_cmpxchg_relaxed */ + +#ifndef atomic64_cmpxchg_acquire +#define atomic64_cmpxchg_acquire(...) \ + __atomic_op_acquire(atomic64_cmpxchg, __VA_ARGS__) +#endif + +#ifndef atomic64_cmpxchg_release +#define atomic64_cmpxchg_release(...) \ + __atomic_op_release(atomic64_cmpxchg, __VA_ARGS__) +#endif + +#ifndef atomic64_cmpxchg +#define atomic64_cmpxchg(...) \ + __atomic_op_fence(atomic64_cmpxchg, __VA_ARGS__) +#endif +#endif /* atomic64_cmpxchg_relaxed */ + +#ifndef atomic64_try_cmpxchg + +#define __atomic64_try_cmpxchg(type, _p, _po, _n) \ +({ \ + typeof(_po) __po = (_po); \ + typeof(*(_po)) __r, __o = *__po; \ + __r = atomic64_cmpxchg##type((_p), __o, (_n)); \ + if (unlikely(__r != __o)) \ + *__po = __r; \ + likely(__r == __o); \ +}) + +#define atomic64_try_cmpxchg(_p, _po, _n) __atomic64_try_cmpxchg(, _p, _po, _n) +#define atomic64_try_cmpxchg_relaxed(_p, _po, _n) __atomic64_try_cmpxchg(_relaxed, _p, _po, _n) +#define atomic64_try_cmpxchg_acquire(_p, _po, _n) __atomic64_try_cmpxchg(_acquire, _p, _po, _n) +#define atomic64_try_cmpxchg_release(_p, _po, _n) __atomic64_try_cmpxchg(_release, _p, _po, _n) + +#else /* atomic64_try_cmpxchg */ +#define atomic64_try_cmpxchg_relaxed atomic64_try_cmpxchg +#define atomic64_try_cmpxchg_acquire atomic64_try_cmpxchg +#define atomic64_try_cmpxchg_release atomic64_try_cmpxchg +#endif /* atomic64_try_cmpxchg */ + +/** + * atomic64_fetch_add_unless - add unless the number is already a given value + * @v: pointer of type atomic64_t + * @a: the amount to add to v... + * @u: ...unless v is equal to u. + * + * Atomically adds @a to @v, if @v was not already @u. + * Returns the original value of @v. + */ +#ifndef atomic64_fetch_add_unless +static inline long long atomic64_fetch_add_unless(atomic64_t *v, long long a, + long long u) +{ + long long c = atomic64_read(v); + + do { + if (unlikely(c == u)) + break; + } while (!atomic64_try_cmpxchg(v, &c, c + a)); + + return c; +} +#endif + +/** + * atomic64_add_unless - add unless the number is already a given value + * @v: pointer of type atomic_t + * @a: the amount to add to v... + * @u: ...unless v is equal to u. + * + * Atomically adds @a to @v, if @v was not already @u. + * Returns true if the addition was done. + */ +static inline bool atomic64_add_unless(atomic64_t *v, long long a, long long u) +{ + return atomic64_fetch_add_unless(v, a, u) != u; +} + +/** + * atomic64_inc_not_zero - increment unless the number is zero + * @v: pointer of type atomic64_t + * + * Atomically increments @v by 1, if @v is non-zero. + * Returns true if the increment was done. + */ +#ifndef atomic64_inc_not_zero +#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) +#endif + +/** + * atomic64_inc_and_test - increment and test + * @v: pointer of type atomic64_t + * + * Atomically increments @v by 1 + * and returns true if the result is zero, or false for all + * other cases. + */ +#ifndef atomic64_inc_and_test +static inline bool atomic64_inc_and_test(atomic64_t *v) +{ + return atomic64_inc_return(v) == 0; +} +#endif + +/** + * atomic64_dec_and_test - decrement and test + * @v: pointer of type atomic64_t + * + * Atomically decrements @v by 1 and + * returns true if the result is 0, or false for all other + * cases. + */ +#ifndef atomic64_dec_and_test +static inline bool atomic64_dec_and_test(atomic64_t *v) +{ + return atomic64_dec_return(v) == 0; +} +#endif + +/** + * atomic64_sub_and_test - subtract value from variable and test result + * @i: integer value to subtract + * @v: pointer of type atomic64_t + * + * Atomically subtracts @i from @v and returns + * true if the result is zero, or false for all + * other cases. + */ +#ifndef atomic64_sub_and_test +static inline bool atomic64_sub_and_test(long long i, atomic64_t *v) +{ + return atomic64_sub_return(i, v) == 0; +} +#endif + +/** + * atomic64_add_negative - add and test if negative + * @i: integer value to add + * @v: pointer of type atomic64_t + * + * Atomically adds @i to @v and returns true + * if the result is negative, or false when + * result is greater than or equal to zero. + */ +#ifndef atomic64_add_negative +static inline bool atomic64_add_negative(long long i, atomic64_t *v) +{ + return atomic64_add_return(i, v) < 0; +} +#endif + +#ifndef atomic64_inc_unless_negative +static inline bool atomic64_inc_unless_negative(atomic64_t *v) +{ + long long c = atomic64_read(v); + + do { + if (unlikely(c < 0)) + return false; + } while (!atomic64_try_cmpxchg(v, &c, c + 1)); + + return true; +} +#endif + +#ifndef atomic64_dec_unless_positive +static inline bool atomic64_dec_unless_positive(atomic64_t *v) +{ + long long c = atomic64_read(v); + + do { + if (unlikely(c > 0)) + return false; + } while (!atomic64_try_cmpxchg(v, &c, c - 1)); + + return true; +} +#endif + +/* + * atomic64_dec_if_positive - decrement by 1 if old value positive + * @v: pointer of type atomic64_t + * + * The function returns the old value of *v minus 1, even if + * the atomic64 variable, v, was not decremented. + */ +#ifndef atomic64_dec_if_positive +static inline long long atomic64_dec_if_positive(atomic64_t *v) +{ + long long dec, c = atomic64_read(v); + + do { + dec = c - 1; + if (unlikely(dec < 0)) + break; + } while (!atomic64_try_cmpxchg(v, &c, dec)); + + return dec; +} +#endif + +#define atomic64_cond_read_relaxed(v, c) smp_cond_load_relaxed(&(v)->counter, (c)) +#define atomic64_cond_read_acquire(v, c) smp_cond_load_acquire(&(v)->counter, (c)) + +#include <asm-generic/atomic-long.h> + +#endif /* _LINUX_ATOMIC_H */ |