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block: Declare several function pointer arguments 'const'

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Make it clear to the compiler and also to humans that the functions
that query request queue properties do not modify any member of the
request_queue data structure.

Reviewed-by: Johannes Thumshirn <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Ming Lei <[email protected]>
Cc: Hannes Reinecke <[email protected]>
Signed-off-by: Bart Van Assche <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Bart Van Assche 2019-08-01 15:50:40 -07:00 • committed by Jens Axboe
commit af2c68fe94
2 changed files with 20 additions and 19 deletions
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7
block/blk-merge.c
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@ -144,7 +144,7 @@ static inline unsigned get_max_io_size(struct request_queue *q,
return sectors;
}
static unsigned get_max_segment_size(struct request_queue *q,
static unsigned get_max_segment_size(const struct request_queue *q,
unsigned offset)
{
unsigned long mask = queue_segment_boundary(q);
@ -161,8 +161,9 @@ static unsigned get_max_segment_size(struct request_queue *q,
* Split the bvec @bv into segments, and update all kinds of
* variables.
*/
static bool bvec_split_segs(struct request_queue *q, struct bio_vec *bv,
unsigned *nsegs, unsigned *sectors, unsigned max_segs)
static bool bvec_split_segs(const struct request_queue *q,
const struct bio_vec *bv, unsigned *nsegs,
unsigned *sectors, unsigned max_segs)
{
unsigned len = bv->bv_len;
unsigned total_len = 0;