[PATCH V2 0/3] blk-mq: refactor and fix on issue request directly

[Jianchao Wang <jianchao.w.wang@oracle.com>]

Hi Jens

The 1st patch refactors the code of issue request directly.
It merges the blk_mq_try_issue_directly and __blk_mq_try_issue_directly
and make blk_mq_try_issue_directly handle return value of .queue_rq itself.

The 2nd patch make blk_mq_sched_insert_requests issue request directly with
bypass "false" instead of the "true", then needn't to handle the non-issued
requests any more.

The 3rd patch ensures the hctx to be ran on its mapped cpu in issue directly
path.

V2:
 - Add 1st and 2nd patch.

Jianchao Wang(3)
    blk-mq: refactor the code of issue request directly
    blk-mq: issue directly with bypass 'false' in blk_mq_sched_insert_requests
    blk-mq: ensure hctx to be ran on mapped cpu when issue

 block/blk-mq-sched.c |   8 ++--
 block/blk-mq.c       | 128 ++++++++++++++++++++++++---------------------------
 2 files changed, 63 insertions(+), 73 deletions(-)