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136 lines
3.5 KiB
136 lines
3.5 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* Generic C implementation of atomic counter operations. Do not include in |
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* machine independent code. |
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* |
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
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* Written by David Howells ([email protected]) |
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*/ |
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#ifndef __ASM_GENERIC_ATOMIC_H |
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#define __ASM_GENERIC_ATOMIC_H |
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#include <asm/cmpxchg.h> |
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#include <asm/barrier.h> |
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#ifdef CONFIG_SMP |
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/* we can build all atomic primitives from cmpxchg */ |
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#define ATOMIC_OP(op, c_op) \ |
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static inline void generic_atomic_##op(int i, atomic_t *v) \ |
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{ \ |
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int c, old; \ |
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\ |
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c = v->counter; \ |
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while ((old = arch_cmpxchg(&v->counter, c, c c_op i)) != c) \ |
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c = old; \ |
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} |
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#define ATOMIC_OP_RETURN(op, c_op) \ |
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static inline int generic_atomic_##op##_return(int i, atomic_t *v) \ |
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{ \ |
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int c, old; \ |
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\ |
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c = v->counter; \ |
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while ((old = arch_cmpxchg(&v->counter, c, c c_op i)) != c) \ |
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c = old; \ |
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\ |
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return c c_op i; \ |
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} |
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#define ATOMIC_FETCH_OP(op, c_op) \ |
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static inline int generic_atomic_fetch_##op(int i, atomic_t *v) \ |
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{ \ |
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int c, old; \ |
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\ |
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c = v->counter; \ |
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while ((old = arch_cmpxchg(&v->counter, c, c c_op i)) != c) \ |
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c = old; \ |
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\ |
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return c; \ |
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} |
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#else |
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#include <linux/irqflags.h> |
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#define ATOMIC_OP(op, c_op) \ |
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static inline void generic_atomic_##op(int i, atomic_t *v) \ |
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{ \ |
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unsigned long flags; \ |
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\ |
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raw_local_irq_save(flags); \ |
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v->counter = v->counter c_op i; \ |
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raw_local_irq_restore(flags); \ |
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} |
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#define ATOMIC_OP_RETURN(op, c_op) \ |
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static inline int generic_atomic_##op##_return(int i, atomic_t *v) \ |
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{ \ |
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unsigned long flags; \ |
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int ret; \ |
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\ |
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raw_local_irq_save(flags); \ |
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ret = (v->counter = v->counter c_op i); \ |
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raw_local_irq_restore(flags); \ |
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\ |
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return ret; \ |
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} |
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#define ATOMIC_FETCH_OP(op, c_op) \ |
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static inline int generic_atomic_fetch_##op(int i, atomic_t *v) \ |
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{ \ |
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unsigned long flags; \ |
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int ret; \ |
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\ |
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raw_local_irq_save(flags); \ |
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ret = v->counter; \ |
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v->counter = v->counter c_op i; \ |
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raw_local_irq_restore(flags); \ |
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\ |
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return ret; \ |
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} |
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#endif /* CONFIG_SMP */ |
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ATOMIC_OP_RETURN(add, +) |
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ATOMIC_OP_RETURN(sub, -) |
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ATOMIC_FETCH_OP(add, +) |
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ATOMIC_FETCH_OP(sub, -) |
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ATOMIC_FETCH_OP(and, &) |
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ATOMIC_FETCH_OP(or, |) |
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ATOMIC_FETCH_OP(xor, ^) |
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ATOMIC_OP(add, +) |
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ATOMIC_OP(sub, -) |
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ATOMIC_OP(and, &) |
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ATOMIC_OP(or, |) |
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ATOMIC_OP(xor, ^) |
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#undef ATOMIC_FETCH_OP |
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#undef ATOMIC_OP_RETURN |
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#undef ATOMIC_OP |
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#define arch_atomic_add_return generic_atomic_add_return |
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#define arch_atomic_sub_return generic_atomic_sub_return |
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#define arch_atomic_fetch_add generic_atomic_fetch_add |
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#define arch_atomic_fetch_sub generic_atomic_fetch_sub |
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#define arch_atomic_fetch_and generic_atomic_fetch_and |
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#define arch_atomic_fetch_or generic_atomic_fetch_or |
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#define arch_atomic_fetch_xor generic_atomic_fetch_xor |
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#define arch_atomic_add generic_atomic_add |
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#define arch_atomic_sub generic_atomic_sub |
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#define arch_atomic_and generic_atomic_and |
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#define arch_atomic_or generic_atomic_or |
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#define arch_atomic_xor generic_atomic_xor |
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#define arch_atomic_read(v) READ_ONCE((v)->counter) |
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#define arch_atomic_set(v, i) WRITE_ONCE(((v)->counter), (i)) |
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#define arch_atomic_xchg(ptr, v) (arch_xchg(&(ptr)->counter, (v))) |
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#define arch_atomic_cmpxchg(v, old, new) (arch_cmpxchg(&((v)->counter), (old), (new))) |
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#endif /* __ASM_GENERIC_ATOMIC_H */
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