blk-mq: bitmap tag: select random tag betweet 0 and (depth - 1)
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 <tom.leiming@gmail.com> Signed-off-by: Jens Axboe <axboe@fb.com>
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@ -449,10 +449,7 @@ void blk_mq_tag_init_last_tag(struct blk_mq_tags *tags, unsigned int *tag)
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{
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unsigned int depth = tags->nr_tags - tags->nr_reserved_tags;
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if (depth > 1)
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*tag = prandom_u32() % (depth - 1);
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else
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*tag = 0;
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*tag = prandom_u32() % depth;
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}
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ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page)
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