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This reverts commit127276c6ce. When all CPUs of one hw queue become offline, there still may have IOs not completed from this hctx. But blk_mq_hw_queue_mapped() is called in blk_mq_queue_tag_busy_iter(), which is used for iterating request in timeout handler, timeout event will be missed on the inactive hctx, then request may never be completed. Also the replementation of blk_mq_hw_queue_mapped() doesn't match the helper's name any more, and it should have been named as blk_mq_hw_queue_active(). Even other callers need further verification about this reimplemenation. So revert this patch now, and we can improve hw queue activate/inactivate event after adequent researching and test. Cc: Stefan Haberland <sth@linux.vnet.ibm.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Christoph Hellwig <hch@lst.de> Reported-by: Jens Axboe <axboe@kernel.dk> Fixes:127276c6ce("blk-mq: reimplement blk_mq_hw_queue_mapped") Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.