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Commit 6182a094 authored by Matthew Wilcox's avatar Matthew Wilcox
Browse files

dmapool: Tidy up includes and add comments 



We were missing a copyright statement and license, so add GPLv2, David
Brownell's copyright and my copyright.

The asm/io.h include was superfluous, but we were missing a few other
necessary includes.

Signed-off-by: default avatarMatthew Wilcox <willy@linux.intel.com>
parent 399154be

mm/dmapool.c

+30 −10
Original line number Original line Diff line number Diff line 
/*

 * DMA Pool allocator

 *

 * Copyright 2001 David Brownell

 * Copyright 2007 Intel Corporation

 *   Author: Matthew Wilcox <willy@linux.intel.com>

 *

 * This software may be redistributed and/or modified under the terms of

 * the GNU General Public License ("GPL") version 2 as published by the

 * Free Software Foundation.

 *

 * This allocator returns small blocks of a given size which are DMA-able by

 * the given device.  It uses the dma_alloc_coherent page allocator to get

 * new pages, then splits them up into blocks of the required size.

 * Many older drivers still have their own code to do this.

 *

 * The current design of this allocator is fairly simple.  The pool is

 * represented by the 'struct dma_pool' which keeps a doubly-linked list of

 * allocated pages.  Each page in the page_list is split into blocks of at

 * least 'size' bytes.

 */





#include <linux/device.h>

#include <linux/device.h>

#include <linux/mm.h>

#include <asm/io.h>		/* Needed for i386 to build */

#include <linux/dma-mapping.h>

#include <linux/dma-mapping.h>

#include <linux/dmapool.h>

#include <linux/dmapool.h>

#include <linux/slab.h>

#include <linux/kernel.h>

#include <linux/list.h>

#include <linux/module.h>

#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/poison.h>

#include <linux/poison.h>

#include <linux/sched.h>

#include <linux/sched.h>



#include <linux/slab.h>

/*

#include <linux/spinlock.h>

 * Pool allocator ... wraps the dma_alloc_coherent page allocator, so

#include <linux/string.h>

 * small blocks are easily used by drivers for bus mastering controllers.

#include <linux/types.h>

 * This should probably be sharing the guts of the slab allocator.

#include <linux/wait.h>

 */





struct dma_pool {		/* the pool */

struct dma_pool {		/* the pool */

	struct list_head page_list;

	struct list_head page_list;
@@ -265,7 +285,7 @@ EXPORT_SYMBOL(dma_pool_destroy); 
 *

 *

 * This returns the kernel virtual address of a currently unused block,

 * This returns the kernel virtual address of a currently unused block,

 * and reports its dma address through the handle.

 * and reports its dma address through the handle.

 * If such a memory block can't be allocated, null is returned.

 * If such a memory block can't be allocated, %NULL is returned.

 */

 */

void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,

void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,

		     dma_addr_t *handle)

		     dma_addr_t *handle)