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block/blk-map.c: use the new object_is_on_stack() helper

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Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Tejun Heo <htejun@gmail.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
FUJITA Tomonori 2008-07-25 19:44:39 -07:00 committed by Linus Torvalds
parent a2e2e3577c
commit a76eef9573
1 changed files with 2 additions and 6 deletions
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8
block/blk-map.c
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@ -269,7 +269,6 @@ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf,
int reading = rq_data_dir(rq) == READ;
int do_copy = 0;
struct bio *bio;
unsigned long stack_mask = ~(THREAD_SIZE - 1);
if (len > (q->max_hw_sectors << 9))
return -EINVAL;
@ -278,11 +277,8 @@ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf,
kaddr = (unsigned long)kbuf;
alignment = queue_dma_alignment(q) | q->dma_pad_mask;
do_copy = ((kaddr & alignment) || (len & alignment));
if (!((kaddr & stack_mask) ^
((unsigned long)current->stack & stack_mask)))
do_copy = 1;
do_copy = ((kaddr & alignment) || (len & alignment) ||
object_is_on_stack(kbuf));
if (do_copy)
bio = bio_copy_kern(q, kbuf, len, gfp_mask, reading);