d3cb487149
Several counters already have the need to use 64 atomic variables on 64 bit platforms (see mm_counter_t in sched.h). We have to do ugly ifdefs to fall back to 32 bit atomic on 32 bit platforms. The VM statistics patch that I am working on will also make more extensive use of atomic64. This patch introduces a new type atomic_long_t by providing definitions in asm-generic/atomic.h that works similar to the c "long" type. Its 32 bits on 32 bit platforms and 64 bits on 64 bit platforms. Also cleans up the determination of the mm_counter_t in sched.h. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
117 lines
2.1 KiB
C
117 lines
2.1 KiB
C
#ifndef _ASM_GENERIC_ATOMIC_H
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#define _ASM_GENERIC_ATOMIC_H
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/*
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* Copyright (C) 2005 Silicon Graphics, Inc.
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* Christoph Lameter <clameter@sgi.com>
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*
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* Allows to provide arch independent atomic definitions without the need to
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* edit all arch specific atomic.h files.
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*/
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/*
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* Suppport for atomic_long_t
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*
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* Casts for parameters are avoided for existing atomic functions in order to
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* avoid issues with cast-as-lval under gcc 4.x and other limitations that the
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* macros of a platform may have.
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*/
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#if BITS_PER_LONG == 64
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typedef atomic64_t atomic_long_t;
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#define ATOMIC_LONG_INIT(i) ATOMIC64_INIT(i)
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static inline long atomic_long_read(atomic_long_t *l)
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{
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atomic64_t *v = (atomic64_t *)l;
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return (long)atomic64_read(v);
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}
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static inline void atomic_long_set(atomic_long_t *l, long i)
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{
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atomic64_t *v = (atomic64_t *)l;
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atomic_set(v, i);
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}
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static inline void atomic_long_inc(atomic_long_t *l)
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{
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atomic64_t *v = (atomic64_t *)l;
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atomic64_inc(v);
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}
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static inline void atomic_long_dec(atomic_long_t *l)
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{
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atomic64_t *v = (atomic64_t *)l;
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atomic64_dec(v);
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}
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static inline void atomic_long_add(long i, atomic_long_t *l)
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{
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atomic64_t *v = (atomic64_t *)l;
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atomic64_add(i, v);
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}
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static inline void atomic_long_sub(long i, atomic_long_t *l)
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{
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atomic64_t *v = (atomic64_t *)l;
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atomic64_sub(i, v);
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}
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#else
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typedef atomic_t atomic_long_t;
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#define ATOMIC_LONG_INIT(i) ATOMIC_INIT(i)
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static inline long atomic_long_read(atomic_long_t *l)
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{
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atomic_t *v = (atomic_t *)l;
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return (long)atomic_read(v);
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}
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static inline void atomic_long_set(atomic_long_t *l, long i)
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{
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atomic_t *v = (atomic_t *)l;
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atomic_set(v, i);
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}
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static inline void atomic_long_inc(atomic_long_t *l)
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{
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atomic_t *v = (atomic_t *)l;
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atomic_inc(v);
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}
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static inline void atomic_long_dec(atomic_long_t *l)
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{
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atomic_t *v = (atomic_t *)l;
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atomic_dec(v);
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}
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static inline void atomic_long_add(long i, atomic_long_t *l)
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{
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atomic_t *v = (atomic_t *)l;
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atomic_add(i, v);
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}
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static inline void atomic_long_sub(long i, atomic_long_t *l)
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{
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atomic_t *v = (atomic_t *)l;
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atomic_sub(i, v);
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}
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#endif
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#endif
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