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2291059c85
Use the much more reader friendly ACCESS_ONCE() instead of the cast to volatile. This is purely a stylistic change. Signed-off-by: Pranith Kumar <bobby.prani@gmail.com> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no> Acked-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: linux-arch@vger.kernel.org Link: http://lkml.kernel.org/r/1411482607-20948-1-git-send-email-bobby.prani@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
150 lines
3.2 KiB
C
150 lines
3.2 KiB
C
/* $Id: atomic.h,v 1.3 2001/07/25 16:15:19 bjornw Exp $ */
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#ifndef __ASM_CRIS_ATOMIC__
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#define __ASM_CRIS_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 <arch/atomic.h>
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#include <arch/system.h>
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#include <asm/barrier.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) ACCESS_ONCE((v)->counter)
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#define atomic_set(v,i) (((v)->counter) = (i))
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/* These should be written in asm but we do it in C for now. */
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#define ATOMIC_OP(op, c_op) \
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static inline void atomic_##op(int i, volatile atomic_t *v) \
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{ \
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unsigned long flags; \
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cris_atomic_save(v, flags); \
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v->counter c_op i; \
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cris_atomic_restore(v, flags); \
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} \
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#define ATOMIC_OP_RETURN(op, c_op) \
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static inline int atomic_##op##_return(int i, volatile atomic_t *v) \
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{ \
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unsigned long flags; \
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int retval; \
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cris_atomic_save(v, flags); \
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retval = (v->counter c_op i); \
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cris_atomic_restore(v, flags); \
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return retval; \
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}
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#define ATOMIC_OPS(op, c_op) ATOMIC_OP(op, c_op) ATOMIC_OP_RETURN(op, c_op)
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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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#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
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static inline int atomic_sub_and_test(int i, volatile atomic_t *v)
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{
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int retval;
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unsigned long flags;
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cris_atomic_save(v, flags);
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retval = (v->counter -= i) == 0;
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cris_atomic_restore(v, flags);
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return retval;
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}
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static inline void atomic_inc(volatile atomic_t *v)
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{
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unsigned long flags;
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cris_atomic_save(v, flags);
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(v->counter)++;
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cris_atomic_restore(v, flags);
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}
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static inline void atomic_dec(volatile atomic_t *v)
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{
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unsigned long flags;
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cris_atomic_save(v, flags);
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(v->counter)--;
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cris_atomic_restore(v, flags);
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}
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static inline int atomic_inc_return(volatile atomic_t *v)
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{
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unsigned long flags;
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int retval;
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cris_atomic_save(v, flags);
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retval = ++(v->counter);
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cris_atomic_restore(v, flags);
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return retval;
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}
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static inline int atomic_dec_return(volatile atomic_t *v)
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{
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unsigned long flags;
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int retval;
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cris_atomic_save(v, flags);
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retval = --(v->counter);
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cris_atomic_restore(v, flags);
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return retval;
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}
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static inline int atomic_dec_and_test(volatile atomic_t *v)
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{
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int retval;
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unsigned long flags;
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cris_atomic_save(v, flags);
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retval = --(v->counter) == 0;
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cris_atomic_restore(v, flags);
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return retval;
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}
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static inline int atomic_inc_and_test(volatile atomic_t *v)
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{
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int retval;
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unsigned long flags;
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cris_atomic_save(v, flags);
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retval = ++(v->counter) == 0;
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cris_atomic_restore(v, flags);
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return retval;
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}
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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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unsigned long flags;
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cris_atomic_save(v, flags);
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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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cris_atomic_restore(v, flags);
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return ret;
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}
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#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
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static inline int __atomic_add_unless(atomic_t *v, int a, int u)
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{
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int ret;
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unsigned long flags;
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cris_atomic_save(v, flags);
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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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cris_atomic_restore(v, flags);
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return ret;
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}
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#endif
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