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genalloc: use bitmap_find_next_zero_area

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Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Akinobu Mita 2009-12-15 16:48:31 -08:00 committed by Linus Torvalds
parent 81f6527bd3
commit 243797f59b
1 changed files with 12 additions and 21 deletions
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33
lib/genalloc.c
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@ -11,6 +11,7 @@
*/
#include <linux/module.h>
#include <linux/bitmap.h>
#include <linux/genalloc.h>
@ -114,7 +115,7 @@ unsigned long gen_pool_alloc(struct gen_pool *pool, size_t size)
struct gen_pool_chunk *chunk;
unsigned long addr, flags;
int order = pool->min_alloc_order;
int nbits, bit, start_bit, end_bit;
int nbits, start_bit, end_bit;
if (size == 0)
return 0;
@ -129,29 +130,19 @@ unsigned long gen_pool_alloc(struct gen_pool *pool, size_t size)
end_bit -= nbits + 1;
spin_lock_irqsave(&chunk->lock, flags);
bit = -1;
while (bit + 1 < end_bit) {
bit = find_next_zero_bit(chunk->bits, end_bit, bit + 1);
if (bit >= end_bit)
break;
start_bit = bit;
if (nbits > 1) {
bit = find_next_bit(chunk->bits, bit + nbits,
bit + 1);
if (bit - start_bit < nbits)
continue;
}
addr = chunk->start_addr +
((unsigned long)start_bit << order);
while (nbits--)
__set_bit(start_bit++, chunk->bits);
start_bit = bitmap_find_next_zero_area(chunk->bits, end_bit, 0,
nbits, 0);
if (start_bit >= end_bit) {
spin_unlock_irqrestore(&chunk->lock, flags);
read_unlock(&pool->lock);
return addr;
continue;
}
addr = chunk->start_addr + ((unsigned long)start_bit << order);
bitmap_set(chunk->bits, start_bit, nbits);
spin_unlock_irqrestore(&chunk->lock, flags);
read_unlock(&pool->lock);
return addr;
}
read_unlock(&pool->lock);
return 0;