The selected tag should be selected at random between 0 and (depth - 1) with probability 1/depth, instead between 0 and (depth - 2) with probability 1/(depth - 1).
Signed-off-by: Ming Lei <[email protected]> --- block/blk-mq-tag.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c index 777aad7..77d2b18 100644 --- a/block/blk-mq-tag.c +++ b/block/blk-mq-tag.c @@ -427,7 +427,7 @@ void blk_mq_tag_init_last_tag(struct blk_mq_tags *tags, unsigned int *tag) { unsigned int depth = tags->nr_tags - tags->nr_reserved_tags; - *tag = prandom_u32() % (depth - 1); + *tag = prandom_u32() % depth; } ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page) -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
