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Commitc807ab520f("block/mq-deadline: Add I/O priority support") modified the behavior of request flag BLK_MQ_INSERT_AT_HEAD from dispatching a request before other requests into dispatching a request before other requests with the same I/O priority. This is not correct since BLK_MQ_INSERT_AT_HEAD is used when requeuing requests and also when a flush request is inserted. Both types of requests should be dispatched as soon as possible. Hence, make the mq-deadline I/O scheduler again ignore the I/O priority for BLK_MQ_INSERT_AT_HEAD requests. Cc: Damien Le Moal <dlemoal@kernel.org> Cc: Yu Kuai <yukuai@kernel.org> Reported-by: chengkaitao <chengkaitao@kylinos.cn> Closes: https://lore.kernel.org/linux-block/20251009155253.14611-1-pilgrimtao@gmail.com/ Fixes:c807ab520f("block/mq-deadline: Add I/O priority support") Signed-off-by: Bart Van Assche <bvanassche@acm.org> Reviewed-by: Damien Le Moalv <dlemoal@kernel.org> 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 reStructuredText markup notation.
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.