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| author | Bart Van Assche <bvanassche@acm.org> | 2019-07-01 08:47:29 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-07-02 21:03:27 -0600 |
| commit | c05f42206f4de12b6807270fc669b45472f1bdb7 (patch) | |
| tree | 82aaf5161958336f8ef635f9f7a8daaeddad7f64 /block/blk-mq-tag.c | |
| parent | 417232880c8a646739dbf4666a231505a1917fcb (diff) | |
| download | linux-c05f42206f4de12b6807270fc669b45472f1bdb7.tar.bz2 | |
blk-mq: remove blk_mq_put_ctx()
No code that occurs between blk_mq_get_ctx() and blk_mq_put_ctx() depends
on preemption being disabled for its correctness. Since removing the CPU
preemption calls does not measurably affect performance, simplify the
blk-mq code by removing the blk_mq_put_ctx() function and also by not
disabling preemption in blk_mq_get_ctx().
Cc: Hannes Reinecke <hare@suse.com>
Cc: Omar Sandoval <osandov@fb.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq-tag.c')
| -rw-r--r-- | block/blk-mq-tag.c | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c index 7513c8eaabee..da19f0bc8876 100644 --- a/block/blk-mq-tag.c +++ b/block/blk-mq-tag.c @@ -113,7 +113,6 @@ unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data) struct sbq_wait_state *ws; DEFINE_SBQ_WAIT(wait); unsigned int tag_offset; - bool drop_ctx; int tag; if (data->flags & BLK_MQ_REQ_RESERVED) { @@ -136,7 +135,6 @@ unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data) return BLK_MQ_TAG_FAIL; ws = bt_wait_ptr(bt, data->hctx); - drop_ctx = data->ctx == NULL; do { struct sbitmap_queue *bt_prev; @@ -161,9 +159,6 @@ unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data) if (tag != -1) break; - if (data->ctx) - blk_mq_put_ctx(data->ctx); - bt_prev = bt; io_schedule(); @@ -189,9 +184,6 @@ unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data) ws = bt_wait_ptr(bt, data->hctx); } while (1); - if (drop_ctx && data->ctx) - blk_mq_put_ctx(data->ctx); - sbitmap_finish_wait(bt, ws, &wait); found_tag: |