forked from mirrors/linux
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>
49 lines
1.6 KiB
C
49 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* 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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int atomic_add_return(int, atomic_t *);
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int atomic_fetch_add(int, atomic_t *);
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int atomic_fetch_and(int, atomic_t *);
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int atomic_fetch_or(int, atomic_t *);
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int atomic_fetch_xor(int, atomic_t *);
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int atomic_cmpxchg(atomic_t *, int, int);
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int atomic_xchg(atomic_t *, int);
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int atomic_fetch_add_unless(atomic_t *, int, int);
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void atomic_set(atomic_t *, int);
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#define atomic_fetch_add_unless atomic_fetch_add_unless
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#define atomic_set_release(v, i) atomic_set((v), (i))
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#define atomic_read(v) READ_ONCE((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_and(i, v) ((void)atomic_fetch_and((i), (v)))
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#define atomic_or(i, v) ((void)atomic_fetch_or((i), (v)))
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#define atomic_xor(i, v) ((void)atomic_fetch_xor((i), (v)))
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#define atomic_sub_return(i, v) (atomic_add_return(-(int)(i), (v)))
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#define atomic_fetch_sub(i, v) (atomic_fetch_add (-(int)(i), (v)))
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#endif /* !(__ARCH_SPARC_ATOMIC__) */
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