forked from mirrors/linux
3c1885187b
Now that all architectures implement ARCH_ATOMIC, we can make it mandatory, removing the Kconfig symbol and logic for !ARCH_ATOMIC. There should be no functional change as a result of this patch. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Will Deacon <will@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20210525140232.53872-33-mark.rutland@arm.com
75 lines
2.5 KiB
C
75 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Generic implementation of 64-bit atomics using spinlocks,
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* useful on processors that don't have 64-bit atomic instructions.
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*
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* Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
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*/
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#ifndef _ASM_GENERIC_ATOMIC64_H
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#define _ASM_GENERIC_ATOMIC64_H
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#include <linux/types.h>
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typedef struct {
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s64 counter;
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} atomic64_t;
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#define ATOMIC64_INIT(i) { (i) }
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extern s64 generic_atomic64_read(const atomic64_t *v);
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extern void generic_atomic64_set(atomic64_t *v, s64 i);
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#define ATOMIC64_OP(op) \
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extern void generic_atomic64_##op(s64 a, atomic64_t *v);
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#define ATOMIC64_OP_RETURN(op) \
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extern s64 generic_atomic64_##op##_return(s64 a, atomic64_t *v);
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#define ATOMIC64_FETCH_OP(op) \
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extern s64 generic_atomic64_fetch_##op(s64 a, atomic64_t *v);
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#define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op)
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ATOMIC64_OPS(add)
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ATOMIC64_OPS(sub)
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#undef ATOMIC64_OPS
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#define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op)
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ATOMIC64_OPS(and)
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ATOMIC64_OPS(or)
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ATOMIC64_OPS(xor)
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#undef ATOMIC64_OPS
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#undef ATOMIC64_FETCH_OP
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#undef ATOMIC64_OP_RETURN
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#undef ATOMIC64_OP
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extern s64 generic_atomic64_dec_if_positive(atomic64_t *v);
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extern s64 generic_atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n);
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extern s64 generic_atomic64_xchg(atomic64_t *v, s64 new);
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extern s64 generic_atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u);
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#define arch_atomic64_read generic_atomic64_read
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#define arch_atomic64_set generic_atomic64_set
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#define arch_atomic64_set_release generic_atomic64_set
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#define arch_atomic64_add generic_atomic64_add
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#define arch_atomic64_add_return generic_atomic64_add_return
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#define arch_atomic64_fetch_add generic_atomic64_fetch_add
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#define arch_atomic64_sub generic_atomic64_sub
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#define arch_atomic64_sub_return generic_atomic64_sub_return
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#define arch_atomic64_fetch_sub generic_atomic64_fetch_sub
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#define arch_atomic64_and generic_atomic64_and
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#define arch_atomic64_fetch_and generic_atomic64_fetch_and
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#define arch_atomic64_or generic_atomic64_or
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#define arch_atomic64_fetch_or generic_atomic64_fetch_or
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#define arch_atomic64_xor generic_atomic64_xor
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#define arch_atomic64_fetch_xor generic_atomic64_fetch_xor
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#define arch_atomic64_dec_if_positive generic_atomic64_dec_if_positive
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#define arch_atomic64_cmpxchg generic_atomic64_cmpxchg
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#define arch_atomic64_xchg generic_atomic64_xchg
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#define arch_atomic64_fetch_add_unless generic_atomic64_fetch_add_unless
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#endif /* _ASM_GENERIC_ATOMIC64_H */
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