56d3648948
sparc32: fully relies on asm-generic/barrier.h and thus can use its implementation. sparc64: is strongly ordered and its atomic ops imply a full barrier, implement the new primitives using barrier(). Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: David S. Miller <davem@davemloft.net> Link: http://lkml.kernel.org/n/tip-2cla9ubpd8chrntnm7e4zdt4@git.kernel.org Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-kernel@vger.kernel.org Cc: sparclinux@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
56 lines
1.9 KiB
C
56 lines
1.9 KiB
C
/* atomic.h: These still suck, but the I-cache hit rate is higher.
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*
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* Copyright (C) 1996 David S. Miller (davem@davemloft.net)
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* Copyright (C) 2000 Anton Blanchard (anton@linuxcare.com.au)
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* Copyright (C) 2007 Kyle McMartin (kyle@parisc-linux.org)
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*
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* Additions by Keith M Wesolowski (wesolows@foobazco.org) based
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* on asm-parisc/atomic.h Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>.
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*/
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#ifndef __ARCH_SPARC_ATOMIC__
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#define __ARCH_SPARC_ATOMIC__
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#include <linux/types.h>
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#include <asm/cmpxchg.h>
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#include <asm/barrier.h>
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#include <asm-generic/atomic64.h>
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#define ATOMIC_INIT(i) { (i) }
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extern int __atomic_add_return(int, atomic_t *);
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extern int atomic_cmpxchg(atomic_t *, int, int);
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#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
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extern int __atomic_add_unless(atomic_t *, int, int);
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extern void atomic_set(atomic_t *, int);
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#define atomic_read(v) (*(volatile int *)&(v)->counter)
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#define atomic_add(i, v) ((void)__atomic_add_return( (int)(i), (v)))
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#define atomic_sub(i, v) ((void)__atomic_add_return(-(int)(i), (v)))
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#define atomic_inc(v) ((void)__atomic_add_return( 1, (v)))
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#define atomic_dec(v) ((void)__atomic_add_return( -1, (v)))
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#define atomic_add_return(i, v) (__atomic_add_return( (int)(i), (v)))
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#define atomic_sub_return(i, v) (__atomic_add_return(-(int)(i), (v)))
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#define atomic_inc_return(v) (__atomic_add_return( 1, (v)))
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#define atomic_dec_return(v) (__atomic_add_return( -1, (v)))
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#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
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/*
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* atomic_inc_and_test - increment and test
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* @v: pointer of type atomic_t
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*
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* Atomically increments @v by 1
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* and returns true if the result is zero, or false for all
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* other cases.
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*/
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#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
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#define atomic_dec_and_test(v) (atomic_dec_return(v) == 0)
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#define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)
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#endif /* !(__ARCH_SPARC_ATOMIC__) */
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