Messages in this thread Patch in this message | | | Date | Thu, 28 Sep 2006 08:16:14 -0500 | From | Dean Nelson <> | Subject | [PATCH] add gen_pool_destroy() |
| |
Modules using the genpool allocator need to be able to kfree() the memory used for the genpool data structures when unloading.
Signed-off-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: Dean Nelson <dcn@sgi.com>
---
Hi Linus,
Would you please accept this patch against the genpool allocator?
There is still an issue with the block comments not being up to kernel-doc standards that plagues the entire file, which I will remedy in a followup patch.
Thanks, Dean
include/linux/genalloc.h | 1 + lib/genalloc.c | 37 +++++++++++++++++++++++++++++++++---- 2 files changed, 34 insertions(+), 4 deletions(-)
Index: linux-2.6/lib/genalloc.c =================================================================== --- linux-2.6.orig/lib/genalloc.c 2006-09-27 13:42:35.000000000 -0500 +++ linux-2.6/lib/genalloc.c 2006-09-28 07:49:05.948568928 -0500 @@ -71,6 +71,35 @@ /* + * 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); + + 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. * @@ -79,7 +108,7 @@ */ unsigned long gen_pool_alloc(struct gen_pool *pool, size_t size) { - struct list_head *_chunk; + struct list_head *_chunk, *_next_chunk; struct gen_pool_chunk *chunk; unsigned long addr, flags; int order = pool->min_alloc_order; @@ -91,7 +120,7 @@ nbits = (size + (1UL << order) - 1) >> order; read_lock(&pool->lock); - list_for_each(_chunk, &pool->chunks) { + list_for_each_safe(_chunk, _next_chunk, &pool->chunks) { chunk = list_entry(_chunk, struct gen_pool_chunk, next_chunk); end_bit = (chunk->end_addr - chunk->start_addr) >> order; @@ -137,7 +166,7 @@ */ void gen_pool_free(struct gen_pool *pool, unsigned long addr, size_t size) { - struct list_head *_chunk; + struct list_head *_chunk, *_next_chunk; struct gen_pool_chunk *chunk; unsigned long flags; int order = pool->min_alloc_order; @@ -146,7 +175,7 @@ nbits = (size + (1UL << order) - 1) >> order; read_lock(&pool->lock); - list_for_each(_chunk, &pool->chunks) { + list_for_each_safe(_chunk, _next_chunk, &pool->chunks) { chunk = list_entry(_chunk, struct gen_pool_chunk, next_chunk); if (addr >= chunk->start_addr && addr < chunk->end_addr) { Index: linux-2.6/include/linux/genalloc.h =================================================================== --- linux-2.6.orig/include/linux/genalloc.h 2006-09-27 13:42:34.000000000 -0500 +++ linux-2.6/include/linux/genalloc.h 2006-09-27 14:18:31.807816652 -0500 @@ -31,5 +31,6 @@ 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); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |