forked from mirrors/linux
44fe84459f
Dmitry noted that the new atomic_try_cmpxchg() primitive is broken when
the old pointer doesn't point to the local stack.
He writes:
"Consider a classical lock-free stack push:
node->next = atomic_read(&head);
do {
} while (!atomic_try_cmpxchg(&head, &node->next, node));
This code is broken with the current implementation, the problem is
with unconditional update of *__po.
In case of success it writes the same value back into *__po, but in
case of cmpxchg success we might have lose ownership of some memory
locations and potentially over what __po has pointed to. The same
holds for the re-read of *__po. "
He also points out that this makes it surprisingly different from the
similar C/C++ atomic operation.
After investigating the code-gen differences caused by this patch; and
a number of alternatives (Linus dislikes this interface lots), we
arrived at these results (size x86_64-defconfig/vmlinux):
GCC-6.3.0:
10735757 cmpxchg
10726413 try_cmpxchg
10730509 try_cmpxchg + patch
10730445 try_cmpxchg-linus
GCC-7 (20170327):
10709514 cmpxchg
10704266 try_cmpxchg
10704266 try_cmpxchg + patch
10704394 try_cmpxchg-linus
From this we see that the patch has the advantage of better code-gen
on GCC-7 and keeps the interface roughly consistent with the C
language variant.
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Fixes: a9ebf306f5 ("locking/atomic: Introduce atomic_try_cmpxchg()")
Signed-off-by: Ingo Molnar <mingo@kernel.org>
1074 lines
30 KiB
C
1074 lines
30 KiB
C
/* 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 <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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* Besides, if an arch has a special barrier for acquire/release, it could
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* implement its own __atomic_op_* and use the same framework for building
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* variants
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*/
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#ifndef __atomic_op_acquire
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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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smp_mb__after_atomic(); \
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__ret; \
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})
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#endif
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#ifndef __atomic_op_release
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#define __atomic_op_release(op, args...) \
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({ \
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smp_mb__before_atomic(); \
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op##_relaxed(args); \
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})
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#endif
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#ifndef __atomic_op_fence
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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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smp_mb__before_atomic(); \
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__ret = op##_relaxed(args); \
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smp_mb__after_atomic(); \
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__ret; \
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})
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#endif
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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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/* atomic_inc_return_relaxed */
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#ifndef atomic_inc_return_relaxed
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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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#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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/* atomic_dec_return_relaxed */
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#ifndef atomic_dec_return_relaxed
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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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#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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#ifdef atomic_andnot
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/* atomic_fetch_andnot_relaxed */
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#ifndef atomic_fetch_andnot_relaxed
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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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#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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#endif /* atomic_andnot */
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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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})
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#define atomic_try_cmpxchg(_p, _po, _n) __atomic_try_cmpxchg(, _p, _po, _n)
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#define atomic_try_cmpxchg_relaxed(_p, _po, _n) __atomic_try_cmpxchg(_relaxed, _p, _po, _n)
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#define atomic_try_cmpxchg_acquire(_p, _po, _n) __atomic_try_cmpxchg(_acquire, _p, _po, _n)
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#define atomic_try_cmpxchg_release(_p, _po, _n) __atomic_try_cmpxchg(_release, _p, _po, _n)
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#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_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, so long as @v was not already @u.
|
|
* Returns non-zero if @v was not @u, and zero otherwise.
|
|
*/
|
|
static inline int atomic_add_unless(atomic_t *v, int a, int u)
|
|
{
|
|
return __atomic_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, so long as @v is non-zero.
|
|
* Returns non-zero if @v was non-zero, and zero otherwise.
|
|
*/
|
|
#ifndef atomic_inc_not_zero
|
|
#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
|
|
#endif
|
|
|
|
#ifndef atomic_andnot
|
|
static inline void atomic_andnot(int i, atomic_t *v)
|
|
{
|
|
atomic_and(~i, v);
|
|
}
|
|
|
|
static inline int atomic_fetch_andnot(int i, atomic_t *v)
|
|
{
|
|
return atomic_fetch_and(~i, v);
|
|
}
|
|
|
|
static inline int atomic_fetch_andnot_relaxed(int i, atomic_t *v)
|
|
{
|
|
return atomic_fetch_and_relaxed(~i, v);
|
|
}
|
|
|
|
static inline int atomic_fetch_andnot_acquire(int i, atomic_t *v)
|
|
{
|
|
return atomic_fetch_and_acquire(~i, v);
|
|
}
|
|
|
|
static inline int atomic_fetch_andnot_release(int i, atomic_t *v)
|
|
{
|
|
return atomic_fetch_and_release(~i, v);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* atomic_inc_not_zero_hint - increment if not null
|
|
* @v: pointer of type atomic_t
|
|
* @hint: probable value of the atomic before the increment
|
|
*
|
|
* This version of atomic_inc_not_zero() gives a hint of probable
|
|
* value of the atomic. This helps processor to not read the memory
|
|
* before doing the atomic read/modify/write cycle, lowering
|
|
* number of bus transactions on some arches.
|
|
*
|
|
* Returns: 0 if increment was not done, 1 otherwise.
|
|
*/
|
|
#ifndef atomic_inc_not_zero_hint
|
|
static inline int atomic_inc_not_zero_hint(atomic_t *v, int hint)
|
|
{
|
|
int val, c = hint;
|
|
|
|
/* sanity test, should be removed by compiler if hint is a constant */
|
|
if (!hint)
|
|
return atomic_inc_not_zero(v);
|
|
|
|
do {
|
|
val = atomic_cmpxchg(v, c, c + 1);
|
|
if (val == c)
|
|
return 1;
|
|
c = val;
|
|
} while (c);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifndef atomic_inc_unless_negative
|
|
static inline int atomic_inc_unless_negative(atomic_t *p)
|
|
{
|
|
int v, v1;
|
|
for (v = 0; v >= 0; v = v1) {
|
|
v1 = atomic_cmpxchg(p, v, v + 1);
|
|
if (likely(v1 == v))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifndef atomic_dec_unless_positive
|
|
static inline int atomic_dec_unless_positive(atomic_t *p)
|
|
{
|
|
int v, v1;
|
|
for (v = 0; v <= 0; v = v1) {
|
|
v1 = atomic_cmpxchg(p, v, v - 1);
|
|
if (likely(v1 == v))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
#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 c, old, dec;
|
|
c = atomic_read(v);
|
|
for (;;) {
|
|
dec = c - 1;
|
|
if (unlikely(dec < 0))
|
|
break;
|
|
old = atomic_cmpxchg((v), c, dec);
|
|
if (likely(old == c))
|
|
break;
|
|
c = old;
|
|
}
|
|
return dec;
|
|
}
|
|
#endif
|
|
|
|
#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 */
|
|
|
|
/* atomic64_inc_return_relaxed */
|
|
#ifndef atomic64_inc_return_relaxed
|
|
#define atomic64_inc_return_relaxed atomic64_inc_return
|
|
#define atomic64_inc_return_acquire atomic64_inc_return
|
|
#define atomic64_inc_return_release 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 */
|
|
|
|
/* atomic64_dec_return_relaxed */
|
|
#ifndef atomic64_dec_return_relaxed
|
|
#define atomic64_dec_return_relaxed atomic64_dec_return
|
|
#define atomic64_dec_return_acquire atomic64_dec_return
|
|
#define atomic64_dec_return_release 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 */
|
|
|
|
#ifdef atomic64_andnot
|
|
/* atomic64_fetch_andnot_relaxed */
|
|
#ifndef atomic64_fetch_andnot_relaxed
|
|
#define atomic64_fetch_andnot_relaxed atomic64_fetch_andnot
|
|
#define atomic64_fetch_andnot_acquire atomic64_fetch_andnot
|
|
#define atomic64_fetch_andnot_release atomic64_fetch_andnot
|
|
|
|
#else /* atomic64_fetch_andnot_relaxed */
|
|
|
|
#ifndef atomic64_fetch_andnot_acquire
|
|
#define atomic64_fetch_andnot_acquire(...) \
|
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__atomic_op_acquire(atomic64_fetch_andnot, __VA_ARGS__)
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#endif
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#ifndef atomic64_fetch_andnot_release
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#define atomic64_fetch_andnot_release(...) \
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__atomic_op_release(atomic64_fetch_andnot, __VA_ARGS__)
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#endif
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#ifndef atomic64_fetch_andnot
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#define atomic64_fetch_andnot(...) \
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__atomic_op_fence(atomic64_fetch_andnot, __VA_ARGS__)
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#endif
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#endif /* atomic64_fetch_andnot_relaxed */
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#endif /* atomic64_andnot */
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/* atomic64_fetch_xor_relaxed */
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#ifndef atomic64_fetch_xor_relaxed
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#define atomic64_fetch_xor_relaxed atomic64_fetch_xor
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#define atomic64_fetch_xor_acquire atomic64_fetch_xor
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#define atomic64_fetch_xor_release atomic64_fetch_xor
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#else /* atomic64_fetch_xor_relaxed */
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#ifndef atomic64_fetch_xor_acquire
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#define atomic64_fetch_xor_acquire(...) \
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__atomic_op_acquire(atomic64_fetch_xor, __VA_ARGS__)
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#endif
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#ifndef atomic64_fetch_xor_release
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#define atomic64_fetch_xor_release(...) \
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__atomic_op_release(atomic64_fetch_xor, __VA_ARGS__)
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#endif
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#ifndef atomic64_fetch_xor
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#define atomic64_fetch_xor(...) \
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__atomic_op_fence(atomic64_fetch_xor, __VA_ARGS__)
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#endif
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#endif /* atomic64_fetch_xor_relaxed */
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/* atomic64_xchg_relaxed */
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#ifndef atomic64_xchg_relaxed
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#define atomic64_xchg_relaxed atomic64_xchg
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#define atomic64_xchg_acquire atomic64_xchg
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#define atomic64_xchg_release atomic64_xchg
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#else /* atomic64_xchg_relaxed */
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#ifndef atomic64_xchg_acquire
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#define atomic64_xchg_acquire(...) \
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__atomic_op_acquire(atomic64_xchg, __VA_ARGS__)
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#endif
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#ifndef atomic64_xchg_release
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#define atomic64_xchg_release(...) \
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__atomic_op_release(atomic64_xchg, __VA_ARGS__)
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#endif
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#ifndef atomic64_xchg
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#define atomic64_xchg(...) \
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__atomic_op_fence(atomic64_xchg, __VA_ARGS__)
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#endif
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#endif /* atomic64_xchg_relaxed */
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/* atomic64_cmpxchg_relaxed */
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#ifndef atomic64_cmpxchg_relaxed
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#define atomic64_cmpxchg_relaxed atomic64_cmpxchg
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#define atomic64_cmpxchg_acquire atomic64_cmpxchg
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#define atomic64_cmpxchg_release atomic64_cmpxchg
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#else /* atomic64_cmpxchg_relaxed */
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#ifndef atomic64_cmpxchg_acquire
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#define atomic64_cmpxchg_acquire(...) \
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__atomic_op_acquire(atomic64_cmpxchg, __VA_ARGS__)
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#endif
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#ifndef atomic64_cmpxchg_release
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#define atomic64_cmpxchg_release(...) \
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__atomic_op_release(atomic64_cmpxchg, __VA_ARGS__)
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#endif
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#ifndef atomic64_cmpxchg
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#define atomic64_cmpxchg(...) \
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__atomic_op_fence(atomic64_cmpxchg, __VA_ARGS__)
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#endif
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#endif /* atomic64_cmpxchg_relaxed */
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#ifndef atomic64_try_cmpxchg
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#define __atomic64_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 = atomic64_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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})
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#define atomic64_try_cmpxchg(_p, _po, _n) __atomic64_try_cmpxchg(, _p, _po, _n)
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#define atomic64_try_cmpxchg_relaxed(_p, _po, _n) __atomic64_try_cmpxchg(_relaxed, _p, _po, _n)
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#define atomic64_try_cmpxchg_acquire(_p, _po, _n) __atomic64_try_cmpxchg(_acquire, _p, _po, _n)
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#define atomic64_try_cmpxchg_release(_p, _po, _n) __atomic64_try_cmpxchg(_release, _p, _po, _n)
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#else /* atomic64_try_cmpxchg */
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#define atomic64_try_cmpxchg_relaxed atomic64_try_cmpxchg
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#define atomic64_try_cmpxchg_acquire atomic64_try_cmpxchg
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#define atomic64_try_cmpxchg_release atomic64_try_cmpxchg
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#endif /* atomic64_try_cmpxchg */
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#ifndef atomic64_andnot
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static inline void atomic64_andnot(long long i, atomic64_t *v)
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{
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atomic64_and(~i, v);
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}
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static inline long long atomic64_fetch_andnot(long long i, atomic64_t *v)
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{
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return atomic64_fetch_and(~i, v);
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}
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static inline long long atomic64_fetch_andnot_relaxed(long long i, atomic64_t *v)
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{
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return atomic64_fetch_and_relaxed(~i, v);
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}
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static inline long long atomic64_fetch_andnot_acquire(long long i, atomic64_t *v)
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{
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return atomic64_fetch_and_acquire(~i, v);
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}
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static inline long long atomic64_fetch_andnot_release(long long i, atomic64_t *v)
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{
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return atomic64_fetch_and_release(~i, v);
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}
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#endif
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#include <asm-generic/atomic-long.h>
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#endif /* _LINUX_ATOMIC_H */
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