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block: mark 1st parameter of bvec_iter_advance as const 

bvec_iter_advance() only writes the parameter of iterator,
so the base address of bvec can be marked as const safely.

Without the change, we can see compiling warning in the
following patch for implementing iterate_bvec(): lib/iov_iter.c
with bvec iterator.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Tested-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Ming Lei 2016-05-30 21:34:31 +08:00 committed by Jens Axboe
parent 0781e79eb2
commit 80f162ff06
1 changed files with 2 additions and 1 deletions
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3
include/linux/bvec.h
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@ -66,7 +66,8 @@ struct bvec_iter {
.bv_offset = bvec_iter_offset((bvec), (iter)), \ .bv_offset = bvec_iter_offset((bvec), (iter)), \
}) })
static inline void bvec_iter_advance(struct bio_vec *bv, struct bvec_iter *iter, static inline void bvec_iter_advance(const struct bio_vec *bv,
struct bvec_iter *iter,
unsigned bytes) unsigned bytes)
{ {
WARN_ONCE(bytes > iter->bi_size, WARN_ONCE(bytes > iter->bi_size,