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Subject[PATCH V2 0/2] blk-mq: some fixes about updating hw queues
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Hi Jens

This patch set fixes some defects during update hw queues.

1st patch refactor the blk-mq debugfs and sysfs register during
blk_mq_update_nr_hw_queues.

2nd patch change the GFP_KERNEL to GFP_NOIO during blk_mq_realloc_hw_ctxs,

3rd patch try to realloc hctx when this hctx is mapped to a different node.

4th patch should be able to fix the panic reported in follwing link
https://marc.info/?l=linux-block&m=153799465603723&w=2

V2:
- Newly add 2nd and 3rd patch.
- Use blk_mq_map_queues when __blk_mq_update_nr_hw_queues fallbacks to
previous nr_hw_queues to avoid driver's .map_queues leak mapping of
some cpus due the fallback nr_hw_queues.
- Add Ming's Reviewed-by in 1st patch.


Jianchao Wang[4]
blk-mq: adjust debugfs and sysfs register when
blk-mq: change gfp flags to GFP_NOIO in
blk-mq: realloc hctx when hw queue is mapped to
blk-mq: fallback to previous nr_hw_queues when

block/blk-core.c | 2 +-
block/blk-flush.c | 6 +--
block/blk-mq.c | 155 ++++++++++++++++++++++++++++++++++--------------------
block/blk.h | 2 +-
4 files changed, 102 insertions(+), 63 deletions(-)

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