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block: fix bogus compiler warnings in blk-merge.c

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The compiler can't figure out that bvprv is initialized whenever 'prev'
is set to 1 as well. Use a pointer to bvprv instead, setting it to NULL
initially, and get rid of the 'prev' tracking. This dumbs it down
enough that gcc is happy.

Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jens Axboe 2015-09-02 16:46:02 -06:00
parent d975f309a8
commit 5014c311ba
1 changed files with 7 additions and 8 deletions
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15
block/blk-merge.c
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@ -67,10 +67,9 @@ static struct bio *blk_bio_segment_split(struct request_queue *q,
struct bio_set *bs)
{
struct bio *split;
struct bio_vec bv, bvprv;
struct bio_vec bv, bvprv, *bvprvp = NULL;
struct bvec_iter iter;
unsigned seg_size = 0, nsegs = 0, sectors = 0;
int prev = 0;
bio_for_each_segment(bv, bio, iter) {
sectors += bv.bv_len >> 9;
@ -82,20 +81,20 @@ static struct bio *blk_bio_segment_split(struct request_queue *q,
* If the queue doesn't support SG gaps and adding this
* offset would create a gap, disallow it.
*/
if (prev && bvec_gap_to_prev(q, &bvprv, bv.bv_offset))
if (bvprvp && bvec_gap_to_prev(q, bvprvp, bv.bv_offset))
goto split;
if (prev && blk_queue_cluster(q)) {
if (bvprvp && blk_queue_cluster(q)) {
if (seg_size + bv.bv_len > queue_max_segment_size(q))
goto new_segment;
if (!BIOVEC_PHYS_MERGEABLE(&bvprv, &bv))
if (!BIOVEC_PHYS_MERGEABLE(bvprvp, &bv))
goto new_segment;
if (!BIOVEC_SEG_BOUNDARY(q, &bvprv, &bv))
if (!BIOVEC_SEG_BOUNDARY(q, bvprvp, &bv))
goto new_segment;
seg_size += bv.bv_len;
bvprv = bv;
prev = 1;
bvprvp = &bv;
continue;
}
new_segment:
@ -104,7 +103,7 @@ static struct bio *blk_bio_segment_split(struct request_queue *q,
nsegs++;
bvprv = bv;
prev = 1;
bvprvp = &bv;
seg_size = bv.bv_len;
}