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9837559d8e
Many of the inc/dec ops are mandatory, but for most architectures inc/dec are simply trivial wrappers around their corresponding add/sub ops. Let's make all the inc/dec ops optional, so that we can get rid of these boilerplate wrappers. The instrumented atomics are updated accordingly. There should be no functional change as a result of this patch. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Will Deacon <will.deacon@arm.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Palmer Dabbelt <palmer@sifive.com> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/lkml/20180621121321.4761-17-mark.rutland@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
99 lines
2.1 KiB
C
99 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ARCH_H8300_ATOMIC__
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#define __ARCH_H8300_ATOMIC__
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#include <linux/compiler.h>
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#include <linux/types.h>
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#include <asm/cmpxchg.h>
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#include <asm/irqflags.h>
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/*
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* Atomic operations that C can't guarantee us. Useful for
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* resource counting etc..
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*/
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#define ATOMIC_INIT(i) { (i) }
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#define atomic_read(v) READ_ONCE((v)->counter)
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#define atomic_set(v, i) WRITE_ONCE(((v)->counter), (i))
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#define ATOMIC_OP_RETURN(op, c_op) \
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static inline int atomic_##op##_return(int i, atomic_t *v) \
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{ \
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h8300flags flags; \
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int ret; \
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\
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flags = arch_local_irq_save(); \
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ret = v->counter c_op i; \
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arch_local_irq_restore(flags); \
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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 atomic_fetch_##op(int i, atomic_t *v) \
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{ \
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h8300flags flags; \
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int ret; \
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\
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flags = arch_local_irq_save(); \
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ret = v->counter; \
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v->counter c_op i; \
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arch_local_irq_restore(flags); \
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return ret; \
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}
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#define ATOMIC_OP(op, c_op) \
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static inline void atomic_##op(int i, atomic_t *v) \
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{ \
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h8300flags flags; \
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\
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flags = arch_local_irq_save(); \
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v->counter c_op i; \
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arch_local_irq_restore(flags); \
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}
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ATOMIC_OP_RETURN(add, +=)
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ATOMIC_OP_RETURN(sub, -=)
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#define ATOMIC_OPS(op, c_op) \
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ATOMIC_OP(op, c_op) \
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ATOMIC_FETCH_OP(op, c_op)
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ATOMIC_OPS(and, &=)
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ATOMIC_OPS(or, |=)
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ATOMIC_OPS(xor, ^=)
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ATOMIC_OPS(add, +=)
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ATOMIC_OPS(sub, -=)
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#undef ATOMIC_OPS
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#undef ATOMIC_OP_RETURN
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#undef ATOMIC_OP
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static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
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{
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int ret;
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h8300flags flags;
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flags = arch_local_irq_save();
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ret = v->counter;
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if (likely(ret == old))
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v->counter = new;
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arch_local_irq_restore(flags);
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return ret;
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}
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static inline int atomic_fetch_add_unless(atomic_t *v, int a, int u)
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{
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int ret;
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h8300flags flags;
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flags = arch_local_irq_save();
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ret = v->counter;
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if (ret != u)
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v->counter += a;
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arch_local_irq_restore(flags);
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return ret;
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}
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#define atomic_fetch_add_unless atomic_fetch_add_unless
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#endif /* __ARCH_H8300_ATOMIC __ */
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