[PATCH 7/7] genalloc: Use bitmap_find_next_zero_area

From: Akinobu Mita
Date: Wed Oct 28 2009 - 04:44:09 EST


Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx>
---
lib/genalloc.c | 33 ++++++++++++---------------------
1 files changed, 12 insertions(+), 21 deletions(-)

diff --git a/lib/genalloc.c b/lib/genalloc.c
index eed2bdb..e67f974 100644
--- a/lib/genalloc.c
+++ b/lib/genalloc.c
@@ -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;
--
1.6.5.1

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