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[PATCH] atomic_long_t & include/asm-generic/atomic.h V2

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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>
This commit is contained in:
Christoph Lameter
2006-01-06 00:11:20 -08:00
committed by Linus Torvalds
parent 070f80326a
commit d3cb487149
24 changed files with 144 additions and 19 deletions
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25
include/linux/sched.h
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@ -254,25 +254,12 @@ extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
* The mm counters are not protected by its page_table_lock,
* so must be incremented atomically.
*/
#ifdef ATOMIC64_INIT
#define set_mm_counter(mm, member, value) atomic64_set(&(mm)->_##member, value)
#define get_mm_counter(mm, member) ((unsigned long)atomic64_read(&(mm)->_##member))
#define add_mm_counter(mm, member, value) atomic64_add(value, &(mm)->_##member)
#define inc_mm_counter(mm, member) atomic64_inc(&(mm)->_##member)
#define dec_mm_counter(mm, member) atomic64_dec(&(mm)->_##member)
typedef atomic64_t mm_counter_t;
#else /* !ATOMIC64_INIT */
/*
* The counters wrap back to 0 at 2^32 * PAGE_SIZE,
* that is, at 16TB if using 4kB page size.
*/
#define set_mm_counter(mm, member, value) atomic_set(&(mm)->_##member, value)
#define get_mm_counter(mm, member) ((unsigned long)atomic_read(&(mm)->_##member))
#define add_mm_counter(mm, member, value) atomic_add(value, &(mm)->_##member)
#define inc_mm_counter(mm, member) atomic_inc(&(mm)->_##member)
#define dec_mm_counter(mm, member) atomic_dec(&(mm)->_##member)
typedef atomic_t mm_counter_t;
#endif /* !ATOMIC64_INIT */
#define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
#define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
#define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
typedef atomic_long_t mm_counter_t;
#else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
/*