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block: fix an address space warning in blk-map.c 

Change type of 2nd parameter of blk_rq_aligned() into unsigned long
and remove unnecessary casting. Now we can call it with 'uaddr'
instead of 'ubuf' in __blk_rq_map_user() so that it can remove
following warnings from sparse:

 block/blk-map.c:57:31: warning: incorrect type in argument 2 (different address spaces)
 block/blk-map.c:57:31:    expected void *addr
 block/blk-map.c:57:31:    got void [noderef] <asn:1>*ubuf

However blk_rq_map_kern() needs one more local variable to handle it.

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
hifive-unleashed-5.1
Namhyung Kim 2010-09-15 13:08:27 +02:00 committed by Jens Axboe
parent 8dcbdc742f
commit 144177991c
2 changed files with 5 additions and 4 deletions
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5
block/blk-map.c
View File

@ -54,7 +54,7 @@ static int __blk_rq_map_user(struct request_queue *q, struct request *rq,
* direct dma. else, set up kernel bounce buffers
*/
uaddr = (unsigned long) ubuf;
if (blk_rq_aligned(q, ubuf, len) && !map_data)
if (blk_rq_aligned(q, uaddr, len) && !map_data)
bio = bio_map_user(q, NULL, uaddr, len, reading, gfp_mask);
else
bio = bio_copy_user(q, map_data, uaddr, len, reading, gfp_mask);
@ -288,6 +288,7 @@ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf,
unsigned int len, gfp_t gfp_mask)
{
int reading = rq_data_dir(rq) == READ;
unsigned long addr = (unsigned long) kbuf;
int do_copy = 0;
struct bio *bio;
int ret;
@ -297,7 +298,7 @@ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf,
if (!len || !kbuf)
return -EINVAL;
do_copy = !blk_rq_aligned(q, kbuf, len) || object_is_on_stack(kbuf);
do_copy = !blk_rq_aligned(q, addr, len) || object_is_on_stack(kbuf);
if (do_copy)
bio = bio_copy_kern(q, kbuf, len, gfp_mask, reading);
else

4
include/linux/blkdev.h
View File

@ -1097,11 +1097,11 @@ static inline int queue_dma_alignment(struct request_queue *q)
return q ? q->dma_alignment : 511;
}
static inline int blk_rq_aligned(struct request_queue *q, void *addr,
static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
unsigned int len)
{
unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
return !((unsigned long)addr & alignment) && !(len & alignment);
return !(addr & alignment) && !(len & alignment);
}
/* assumes size > 256 */