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John Ogness
1f5d783094
It is important that any new records are visible to preparing waiters before the waker checks if the wait queue is empty. Otherwise it is possible that: - there are new records available - the waker sees an empty wait queue and does not wake - the preparing waiter sees no new records and begins to wait This is exactly the problem that the function description of waitqueue_active() warns about. Use wq_has_sleeper() instead of waitqueue_active() because it includes the necessary full memory barrier. Signed-off-by: John Ogness <[email protected]> Reviewed-by: Petr Mladek <[email protected]> Signed-off-by: Petr Mladek <[email protected]> Link: https://lore.kernel.org/r/[email protected]
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.