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.
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.
Forked from
Linaro / linux / kernel / torvalds / linux
John Ogness
authored
The legacy CFQ IO scheduler could call put_io_context() in its exit_icq() elevator callback. This led to a lockdep warning, which was fixed in commit d8c66c5d ("block: fix lockdep warning on io_context release put_io_context()") by using a nested subclass for the ioc spinlock. However, with commit f382fb0b ("block: remove legacy IO schedulers") the CFQ IO scheduler no longer exists. The BFQ IO scheduler also implements the exit_icq() elevator callback but does not call put_io_context(). The nested subclass for the ioc spinlock is no longer needed. Since it existed as an exception and no longer applies, remove the nested subclass usage. Signed-off-by:John Ogness <john.ogness@linutronix.de> Reviewed-by:
Daniel Wagner <dwagner@suse.de> Signed-off-by:
Jens Axboe <axboe@kernel.dk>
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