1318 lines
37 KiB
C
Executable file
1318 lines
37 KiB
C
Executable file
/* SPDX-License-Identifier: GPL-2.0 */
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/* Atomic operations usable in machine independent code */
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#ifndef _LINUX_ATOMIC_H
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#define _LINUX_ATOMIC_H
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#include <linux/types.h>
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#include <asm/atomic.h>
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#include <asm/barrier.h>
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/*
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* Relaxed variants of xchg, cmpxchg and some atomic operations.
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*
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* We support four variants:
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*
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* - Fully ordered: The default implementation, no suffix required.
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* - Acquire: Provides ACQUIRE semantics, _acquire suffix.
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* - Release: Provides RELEASE semantics, _release suffix.
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* - Relaxed: No ordering guarantees, _relaxed suffix.
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*
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* For compound atomics performing both a load and a store, ACQUIRE
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* semantics apply only to the load and RELEASE semantics only to the
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* store portion of the operation. Note that a failed cmpxchg_acquire
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* does -not- imply any memory ordering constraints.
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*
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* See Documentation/memory-barriers.txt for ACQUIRE/RELEASE definitions.
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*/
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#ifndef atomic_read_acquire
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#define atomic_read_acquire(v) smp_load_acquire(&(v)->counter)
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#endif
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#ifndef atomic_set_release
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#define atomic_set_release(v, i) smp_store_release(&(v)->counter, (i))
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#endif
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/*
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* The idea here is to build acquire/release variants by adding explicit
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* barriers on top of the relaxed variant. In the case where the relaxed
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* variant is already fully ordered, no additional barriers are needed.
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*
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* If an architecture overrides __atomic_acquire_fence() it will probably
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* want to define smp_mb__after_spinlock().
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*/
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#ifndef __atomic_acquire_fence
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#define __atomic_acquire_fence smp_mb__after_atomic
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#endif
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#ifndef __atomic_release_fence
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#define __atomic_release_fence smp_mb__before_atomic
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#endif
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#ifndef __atomic_pre_full_fence
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#define __atomic_pre_full_fence smp_mb__before_atomic
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#endif
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#ifndef __atomic_post_full_fence
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#define __atomic_post_full_fence smp_mb__after_atomic
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#endif
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#define __atomic_op_acquire(op, args...) \
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({ \
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typeof(op##_relaxed(args)) __ret = op##_relaxed(args); \
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__atomic_acquire_fence(); \
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__ret; \
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})
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#define __atomic_op_release(op, args...) \
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({ \
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__atomic_release_fence(); \
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op##_relaxed(args); \
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})
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#define __atomic_op_fence(op, args...) \
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({ \
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typeof(op##_relaxed(args)) __ret; \
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__atomic_pre_full_fence(); \
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__ret = op##_relaxed(args); \
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__atomic_post_full_fence(); \
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__ret; \
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})
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/* atomic_add_return_relaxed */
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#ifndef atomic_add_return_relaxed
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#define atomic_add_return_relaxed atomic_add_return
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#define atomic_add_return_acquire atomic_add_return
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#define atomic_add_return_release atomic_add_return
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#else /* atomic_add_return_relaxed */
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#ifndef atomic_add_return_acquire
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#define atomic_add_return_acquire(...) \
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__atomic_op_acquire(atomic_add_return, __VA_ARGS__)
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#endif
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#ifndef atomic_add_return_release
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#define atomic_add_return_release(...) \
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__atomic_op_release(atomic_add_return, __VA_ARGS__)
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#endif
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#ifndef atomic_add_return
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#define atomic_add_return(...) \
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__atomic_op_fence(atomic_add_return, __VA_ARGS__)
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#endif
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#endif /* atomic_add_return_relaxed */
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#ifndef atomic_inc
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#define atomic_inc(v) atomic_add(1, (v))
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#endif
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/* atomic_inc_return_relaxed */
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#ifndef atomic_inc_return_relaxed
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#ifndef atomic_inc_return
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#define atomic_inc_return(v) atomic_add_return(1, (v))
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#define atomic_inc_return_relaxed(v) atomic_add_return_relaxed(1, (v))
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#define atomic_inc_return_acquire(v) atomic_add_return_acquire(1, (v))
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#define atomic_inc_return_release(v) atomic_add_return_release(1, (v))
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#else /* atomic_inc_return */
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#define atomic_inc_return_relaxed atomic_inc_return
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#define atomic_inc_return_acquire atomic_inc_return
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#define atomic_inc_return_release atomic_inc_return
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#endif /* atomic_inc_return */
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#else /* atomic_inc_return_relaxed */
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#ifndef atomic_inc_return_acquire
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#define atomic_inc_return_acquire(...) \
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__atomic_op_acquire(atomic_inc_return, __VA_ARGS__)
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#endif
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#ifndef atomic_inc_return_release
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#define atomic_inc_return_release(...) \
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__atomic_op_release(atomic_inc_return, __VA_ARGS__)
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#endif
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#ifndef atomic_inc_return
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#define atomic_inc_return(...) \
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__atomic_op_fence(atomic_inc_return, __VA_ARGS__)
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#endif
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#endif /* atomic_inc_return_relaxed */
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/* atomic_sub_return_relaxed */
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#ifndef atomic_sub_return_relaxed
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#define atomic_sub_return_relaxed atomic_sub_return
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#define atomic_sub_return_acquire atomic_sub_return
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#define atomic_sub_return_release atomic_sub_return
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#else /* atomic_sub_return_relaxed */
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#ifndef atomic_sub_return_acquire
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#define atomic_sub_return_acquire(...) \
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__atomic_op_acquire(atomic_sub_return, __VA_ARGS__)
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#endif
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#ifndef atomic_sub_return_release
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#define atomic_sub_return_release(...) \
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__atomic_op_release(atomic_sub_return, __VA_ARGS__)
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#endif
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#ifndef atomic_sub_return
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#define atomic_sub_return(...) \
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__atomic_op_fence(atomic_sub_return, __VA_ARGS__)
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#endif
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#endif /* atomic_sub_return_relaxed */
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#ifndef atomic_dec
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#define atomic_dec(v) atomic_sub(1, (v))
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#endif
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/* atomic_dec_return_relaxed */
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#ifndef atomic_dec_return_relaxed
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#ifndef atomic_dec_return
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#define atomic_dec_return(v) atomic_sub_return(1, (v))
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#define atomic_dec_return_relaxed(v) atomic_sub_return_relaxed(1, (v))
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#define atomic_dec_return_acquire(v) atomic_sub_return_acquire(1, (v))
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#define atomic_dec_return_release(v) atomic_sub_return_release(1, (v))
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#else /* atomic_dec_return */
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#define atomic_dec_return_relaxed atomic_dec_return
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#define atomic_dec_return_acquire atomic_dec_return
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#define atomic_dec_return_release atomic_dec_return
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#endif /* atomic_dec_return */
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#else /* atomic_dec_return_relaxed */
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#ifndef atomic_dec_return_acquire
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#define atomic_dec_return_acquire(...) \
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__atomic_op_acquire(atomic_dec_return, __VA_ARGS__)
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#endif
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#ifndef atomic_dec_return_release
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#define atomic_dec_return_release(...) \
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__atomic_op_release(atomic_dec_return, __VA_ARGS__)
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#endif
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#ifndef atomic_dec_return
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#define atomic_dec_return(...) \
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__atomic_op_fence(atomic_dec_return, __VA_ARGS__)
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#endif
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#endif /* atomic_dec_return_relaxed */
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/* atomic_fetch_add_relaxed */
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#ifndef atomic_fetch_add_relaxed
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#define atomic_fetch_add_relaxed atomic_fetch_add
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#define atomic_fetch_add_acquire atomic_fetch_add
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#define atomic_fetch_add_release atomic_fetch_add
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#else /* atomic_fetch_add_relaxed */
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#ifndef atomic_fetch_add_acquire
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#define atomic_fetch_add_acquire(...) \
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__atomic_op_acquire(atomic_fetch_add, __VA_ARGS__)
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#endif
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#ifndef atomic_fetch_add_release
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#define atomic_fetch_add_release(...) \
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__atomic_op_release(atomic_fetch_add, __VA_ARGS__)
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#endif
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#ifndef atomic_fetch_add
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#define atomic_fetch_add(...) \
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__atomic_op_fence(atomic_fetch_add, __VA_ARGS__)
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#endif
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#endif /* atomic_fetch_add_relaxed */
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/* atomic_fetch_inc_relaxed */
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#ifndef atomic_fetch_inc_relaxed
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#ifndef atomic_fetch_inc
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#define atomic_fetch_inc(v) atomic_fetch_add(1, (v))
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#define atomic_fetch_inc_relaxed(v) atomic_fetch_add_relaxed(1, (v))
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#define atomic_fetch_inc_acquire(v) atomic_fetch_add_acquire(1, (v))
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#define atomic_fetch_inc_release(v) atomic_fetch_add_release(1, (v))
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#else /* atomic_fetch_inc */
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#define atomic_fetch_inc_relaxed atomic_fetch_inc
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#define atomic_fetch_inc_acquire atomic_fetch_inc
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#define atomic_fetch_inc_release atomic_fetch_inc
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#endif /* atomic_fetch_inc */
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#else /* atomic_fetch_inc_relaxed */
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#ifndef atomic_fetch_inc_acquire
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#define atomic_fetch_inc_acquire(...) \
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__atomic_op_acquire(atomic_fetch_inc, __VA_ARGS__)
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#endif
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#ifndef atomic_fetch_inc_release
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#define atomic_fetch_inc_release(...) \
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__atomic_op_release(atomic_fetch_inc, __VA_ARGS__)
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#endif
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#ifndef atomic_fetch_inc
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#define atomic_fetch_inc(...) \
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__atomic_op_fence(atomic_fetch_inc, __VA_ARGS__)
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#endif
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#endif /* atomic_fetch_inc_relaxed */
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/* atomic_fetch_sub_relaxed */
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#ifndef atomic_fetch_sub_relaxed
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#define atomic_fetch_sub_relaxed atomic_fetch_sub
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#define atomic_fetch_sub_acquire atomic_fetch_sub
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#define atomic_fetch_sub_release atomic_fetch_sub
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#else /* atomic_fetch_sub_relaxed */
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#ifndef atomic_fetch_sub_acquire
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#define atomic_fetch_sub_acquire(...) \
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__atomic_op_acquire(atomic_fetch_sub, __VA_ARGS__)
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#endif
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#ifndef atomic_fetch_sub_release
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#define atomic_fetch_sub_release(...) \
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__atomic_op_release(atomic_fetch_sub, __VA_ARGS__)
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#endif
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#ifndef atomic_fetch_sub
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#define atomic_fetch_sub(...) \
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__atomic_op_fence(atomic_fetch_sub, __VA_ARGS__)
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#endif
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#endif /* atomic_fetch_sub_relaxed */
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/* atomic_fetch_dec_relaxed */
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#ifndef atomic_fetch_dec_relaxed
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#ifndef atomic_fetch_dec
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#define atomic_fetch_dec(v) atomic_fetch_sub(1, (v))
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#define atomic_fetch_dec_relaxed(v) atomic_fetch_sub_relaxed(1, (v))
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#define atomic_fetch_dec_acquire(v) atomic_fetch_sub_acquire(1, (v))
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#define atomic_fetch_dec_release(v) atomic_fetch_sub_release(1, (v))
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#else /* atomic_fetch_dec */
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#define atomic_fetch_dec_relaxed atomic_fetch_dec
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#define atomic_fetch_dec_acquire atomic_fetch_dec
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#define atomic_fetch_dec_release atomic_fetch_dec
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#endif /* atomic_fetch_dec */
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#else /* atomic_fetch_dec_relaxed */
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#ifndef atomic_fetch_dec_acquire
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#define atomic_fetch_dec_acquire(...) \
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__atomic_op_acquire(atomic_fetch_dec, __VA_ARGS__)
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#endif
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#ifndef atomic_fetch_dec_release
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#define atomic_fetch_dec_release(...) \
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__atomic_op_release(atomic_fetch_dec, __VA_ARGS__)
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#endif
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#ifndef atomic_fetch_dec
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#define atomic_fetch_dec(...) \
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__atomic_op_fence(atomic_fetch_dec, __VA_ARGS__)
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#endif
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#endif /* atomic_fetch_dec_relaxed */
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/* atomic_fetch_or_relaxed */
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#ifndef atomic_fetch_or_relaxed
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#define atomic_fetch_or_relaxed atomic_fetch_or
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#define atomic_fetch_or_acquire atomic_fetch_or
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#define atomic_fetch_or_release atomic_fetch_or
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#else /* atomic_fetch_or_relaxed */
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#ifndef atomic_fetch_or_acquire
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#define atomic_fetch_or_acquire(...) \
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__atomic_op_acquire(atomic_fetch_or, __VA_ARGS__)
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#endif
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#ifndef atomic_fetch_or_release
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#define atomic_fetch_or_release(...) \
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__atomic_op_release(atomic_fetch_or, __VA_ARGS__)
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#endif
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#ifndef atomic_fetch_or
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#define atomic_fetch_or(...) \
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__atomic_op_fence(atomic_fetch_or, __VA_ARGS__)
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#endif
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#endif /* atomic_fetch_or_relaxed */
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/* atomic_fetch_and_relaxed */
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#ifndef atomic_fetch_and_relaxed
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#define atomic_fetch_and_relaxed atomic_fetch_and
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#define atomic_fetch_and_acquire atomic_fetch_and
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#define atomic_fetch_and_release atomic_fetch_and
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#else /* atomic_fetch_and_relaxed */
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#ifndef atomic_fetch_and_acquire
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#define atomic_fetch_and_acquire(...) \
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__atomic_op_acquire(atomic_fetch_and, __VA_ARGS__)
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#endif
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#ifndef atomic_fetch_and_release
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#define atomic_fetch_and_release(...) \
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__atomic_op_release(atomic_fetch_and, __VA_ARGS__)
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#endif
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#ifndef atomic_fetch_and
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#define atomic_fetch_and(...) \
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__atomic_op_fence(atomic_fetch_and, __VA_ARGS__)
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#endif
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#endif /* atomic_fetch_and_relaxed */
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#ifndef atomic_andnot
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#define atomic_andnot(i, v) atomic_and(~(int)(i), (v))
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#endif
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#ifndef atomic_fetch_andnot_relaxed
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#ifndef atomic_fetch_andnot
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#define atomic_fetch_andnot(i, v) atomic_fetch_and(~(int)(i), (v))
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#define atomic_fetch_andnot_relaxed(i, v) atomic_fetch_and_relaxed(~(int)(i), (v))
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#define atomic_fetch_andnot_acquire(i, v) atomic_fetch_and_acquire(~(int)(i), (v))
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#define atomic_fetch_andnot_release(i, v) atomic_fetch_and_release(~(int)(i), (v))
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#else /* atomic_fetch_andnot */
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#define atomic_fetch_andnot_relaxed atomic_fetch_andnot
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#define atomic_fetch_andnot_acquire atomic_fetch_andnot
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#define atomic_fetch_andnot_release atomic_fetch_andnot
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#endif /* atomic_fetch_andnot */
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#else /* atomic_fetch_andnot_relaxed */
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#ifndef atomic_fetch_andnot_acquire
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#define atomic_fetch_andnot_acquire(...) \
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__atomic_op_acquire(atomic_fetch_andnot, __VA_ARGS__)
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#endif
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#ifndef atomic_fetch_andnot_release
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#define atomic_fetch_andnot_release(...) \
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__atomic_op_release(atomic_fetch_andnot, __VA_ARGS__)
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#endif
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#ifndef atomic_fetch_andnot
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#define atomic_fetch_andnot(...) \
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__atomic_op_fence(atomic_fetch_andnot, __VA_ARGS__)
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#endif
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#endif /* atomic_fetch_andnot_relaxed */
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/* atomic_fetch_xor_relaxed */
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#ifndef atomic_fetch_xor_relaxed
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#define atomic_fetch_xor_relaxed atomic_fetch_xor
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#define atomic_fetch_xor_acquire atomic_fetch_xor
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#define atomic_fetch_xor_release atomic_fetch_xor
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#else /* atomic_fetch_xor_relaxed */
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#ifndef atomic_fetch_xor_acquire
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#define atomic_fetch_xor_acquire(...) \
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__atomic_op_acquire(atomic_fetch_xor, __VA_ARGS__)
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#endif
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#ifndef atomic_fetch_xor_release
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#define atomic_fetch_xor_release(...) \
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__atomic_op_release(atomic_fetch_xor, __VA_ARGS__)
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#endif
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#ifndef atomic_fetch_xor
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#define atomic_fetch_xor(...) \
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__atomic_op_fence(atomic_fetch_xor, __VA_ARGS__)
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#endif
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#endif /* atomic_fetch_xor_relaxed */
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/* atomic_xchg_relaxed */
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#ifndef atomic_xchg_relaxed
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#define atomic_xchg_relaxed atomic_xchg
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#define atomic_xchg_acquire atomic_xchg
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#define atomic_xchg_release atomic_xchg
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#else /* atomic_xchg_relaxed */
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#ifndef atomic_xchg_acquire
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#define atomic_xchg_acquire(...) \
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__atomic_op_acquire(atomic_xchg, __VA_ARGS__)
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#endif
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#ifndef atomic_xchg_release
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#define atomic_xchg_release(...) \
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__atomic_op_release(atomic_xchg, __VA_ARGS__)
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#endif
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#ifndef atomic_xchg
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#define atomic_xchg(...) \
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__atomic_op_fence(atomic_xchg, __VA_ARGS__)
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#endif
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#endif /* atomic_xchg_relaxed */
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/* atomic_cmpxchg_relaxed */
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#ifndef atomic_cmpxchg_relaxed
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#define atomic_cmpxchg_relaxed atomic_cmpxchg
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#define atomic_cmpxchg_acquire atomic_cmpxchg
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#define atomic_cmpxchg_release atomic_cmpxchg
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#else /* atomic_cmpxchg_relaxed */
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#ifndef atomic_cmpxchg_acquire
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#define atomic_cmpxchg_acquire(...) \
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__atomic_op_acquire(atomic_cmpxchg, __VA_ARGS__)
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#endif
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#ifndef atomic_cmpxchg_release
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#define atomic_cmpxchg_release(...) \
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__atomic_op_release(atomic_cmpxchg, __VA_ARGS__)
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#endif
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#ifndef atomic_cmpxchg
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#define atomic_cmpxchg(...) \
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__atomic_op_fence(atomic_cmpxchg, __VA_ARGS__)
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#endif
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#endif /* atomic_cmpxchg_relaxed */
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#ifndef atomic_try_cmpxchg
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#define __atomic_try_cmpxchg(type, _p, _po, _n) \
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({ \
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typeof(_po) __po = (_po); \
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typeof(*(_po)) __r, __o = *__po; \
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__r = atomic_cmpxchg##type((_p), __o, (_n)); \
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if (unlikely(__r != __o)) \
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*__po = __r; \
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likely(__r == __o); \
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})
|
|
|
|
#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 */
|