X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2Fgenalloc.c;h=f6d276db2d58f97c80db2b0aececde84120893a9;hb=4bab0ea1d42dd1927af9df6fbf0003fc00617c50;hp=71338b48e88919ab2a668ecf2ff9f1e25a91b0fa;hpb=0a1340c185734a57fbf4775927966ad4a1347b02;p=linux-2.6-omap-h63xx.git

diff --git a/lib/genalloc.c b/lib/genalloc.c
index 71338b48e88..f6d276db2d5 100644
--- a/lib/genalloc.c
+++ b/lib/genalloc.c
@@ -14,11 +14,13 @@
 #include <linux/genalloc.h>
 
 
-/*
- * Create a new special memory pool.
- *
+/**
+ * gen_pool_create - create a new special memory pool
  * @min_alloc_order: log base 2 of number of bytes each bitmap bit represents
  * @nid: node id of the node the pool structure should be allocated on, or -1
+ *
+ * Create a new special memory pool that can be used to manage special purpose
+ * memory not managed by the regular kmalloc/kfree interface.
  */
 struct gen_pool *gen_pool_create(int min_alloc_order, int nid)
 {
@@ -34,15 +36,15 @@ struct gen_pool *gen_pool_create(int min_alloc_order, int nid)
 }
 EXPORT_SYMBOL(gen_pool_create);
 
-
-/*
- * Add a new chunk of memory to the specified pool.
- *
+/**
+ * gen_pool_add - add a new chunk of special memory to the pool
  * @pool: pool to add new memory chunk to
  * @addr: starting address of memory chunk to add to pool
  * @size: size in bytes of the memory chunk to add to pool
  * @nid: node id of the node the chunk structure and bitmap should be
  *       allocated on, or -1
+ *
+ * Add a new chunk of special memory to the specified pool.
  */
 int gen_pool_add(struct gen_pool *pool, unsigned long addr, size_t size,
 		 int nid)
@@ -52,11 +54,10 @@ int gen_pool_add(struct gen_pool *pool, unsigned long addr, size_t size,
 	int nbytes = sizeof(struct gen_pool_chunk) +
 				(nbits + BITS_PER_BYTE - 1) / BITS_PER_BYTE;
 
-	chunk = kmalloc_node(nbytes, GFP_KERNEL, nid);
+	chunk = kmalloc_node(nbytes, GFP_KERNEL | __GFP_ZERO, nid);
 	if (unlikely(chunk == NULL))
 		return -1;
 
-	memset(chunk, 0, nbytes);
 	spin_lock_init(&chunk->lock);
 	chunk->start_addr = addr;
 	chunk->end_addr = addr + size;
@@ -69,13 +70,44 @@ int gen_pool_add(struct gen_pool *pool, unsigned long addr, size_t size,
 }
 EXPORT_SYMBOL(gen_pool_add);
 
-
-/*
- * Allocate the requested number of bytes from the specified pool.
- * Uses a first-fit algorithm.
+/**
+ * gen_pool_destroy - destroy a special memory pool
+ * @pool: pool to destroy
  *
+ * Destroy the specified special memory pool. Verifies that there are no
+ * outstanding allocations.
+ */
+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);
+
+/**
+ * gen_pool_alloc - allocate special memory from the pool
  * @pool: pool to allocate from
  * @size: number of bytes to allocate from the pool
+ *
+ * Allocate the requested number of bytes from the specified pool.
+ * Uses a first-fit algorithm.
  */
 unsigned long gen_pool_alloc(struct gen_pool *pool, size_t size)
 {
@@ -115,7 +147,7 @@ unsigned long gen_pool_alloc(struct gen_pool *pool, size_t size)
 			addr = chunk->start_addr +
 					    ((unsigned long)start_bit << order);
 			while (nbits--)
-				__set_bit(start_bit++, &chunk->bits);
+				__set_bit(start_bit++, chunk->bits);
 			spin_unlock_irqrestore(&chunk->lock, flags);
 			read_unlock(&pool->lock);
 			return addr;
@@ -127,13 +159,13 @@ unsigned long gen_pool_alloc(struct gen_pool *pool, size_t size)
 }
 EXPORT_SYMBOL(gen_pool_alloc);
 
-
-/*
- * Free the specified memory back to the specified pool.
- *
+/**
+ * gen_pool_free - free allocated special memory back to the pool
  * @pool: pool to free to
  * @addr: starting address of memory to free back to pool
  * @size: size in bytes of memory to free
+ *
+ * Free previously allocated special memory back to the specified pool.
  */
 void gen_pool_free(struct gen_pool *pool, unsigned long addr, size_t size)
 {
@@ -154,7 +186,7 @@ void gen_pool_free(struct gen_pool *pool, unsigned long addr, size_t size)
 			spin_lock_irqsave(&chunk->lock, flags);
 			bit = (addr - chunk->start_addr) >> order;
 			while (nbits--)
-				__clear_bit(bit++, &chunk->bits);
+				__clear_bit(bit++, chunk->bits);
 			spin_unlock_irqrestore(&chunk->lock, flags);
 			break;
 		}