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Logan Gunthorpe
ee1aa06ba3
raid5_get_active_stripe() can sleep in various situations and it is called by make_stripe_request() while inside the prepare_to_wait()/finish_wait() section. Nested waits like this are not supported. This was noticed while making other changes that add different sleeps to raid5_get_active_stripe() that caused a WARNING with CONFIG_DEBUG_ATOMIC_SLEEP. No ill effects have been noticed with the code as is, but theoretically a nested and here could cause a dead lock so it should be fixed. To fix this, convert the prepare_to_wait() call to use wake_woken() which supports nested sleeps. Link: https://lwn.net/Articles/628628/ Signed-off-by: Logan Gunthorpe <logang@deltatee.com> Signed-off-by: Song Liu <song@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 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.