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[PATCH] LIB: add gen_pool_destroy()

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Modules using the genpool allocator need to be able to destroy the data
structure when unloading.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Cc: Dean Nelson <dcn@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Steve Wise 2006-10-02 02:17:00 -07:00 committed by Linus Torvalds
parent d834c16516
commit 322acc96d4
2 changed files with 31 additions and 0 deletions
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1
include/linux/genalloc.h
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@ -31,5 +31,6 @@ struct gen_pool_chunk {
extern struct gen_pool *gen_pool_create(int, int);
extern int gen_pool_add(struct gen_pool *, unsigned long, size_t, int);
extern void gen_pool_destroy(struct gen_pool *);
extern unsigned long gen_pool_alloc(struct gen_pool *, size_t);
extern void gen_pool_free(struct gen_pool *, unsigned long, size_t);

30
lib/genalloc.c
View File

@ -70,6 +70,36 @@ int gen_pool_add(struct gen_pool *pool, unsigned long addr, size_t size,
EXPORT_SYMBOL(gen_pool_add);
/*
* Destroy a memory pool. Verifies that there are no outstanding allocations.
*
* @pool: pool to destroy
*/
void gen_pool_destroy(struct gen_pool *pool)
{
struct list_head *_chunk, *_next_chunk;
struct gen_pool_chunk *chunk;
int order = pool->min_alloc_order;
int bit, end_bit;
write_lock(&pool->lock);
list_for_each_safe(_chunk, _next_chunk, &pool->chunks) {
chunk = list_entry(_chunk, struct gen_pool_chunk, next_chunk);
list_del(&chunk->next_chunk);
end_bit = (chunk->end_addr - chunk->start_addr) >> order;
bit = find_next_bit(chunk->bits, end_bit, 0);
BUG_ON(bit < end_bit);
kfree(chunk);
}
kfree(pool);
return;
}
EXPORT_SYMBOL(gen_pool_destroy);
/*
* Allocate the requested number of bytes from the specified pool.
* Uses a first-fit algorithm.