b3fa03fd1b
Convert explicit barrier around iopoll_completed to smp_load_acquire() and smp_store_release(). Similar on the callback side, but replaces a single smp_rmb() with per-request smp_load_acquire(), neither imply any extra CPU ordering for x86. Use READ_ONCE as usual where it doesn't matter. Use it to move filling CQEs by iopoll earlier, that will be necessary to avoid traversing the list one extra time in the future. Suggested-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/8bd663cb15efdc72d6247c38ee810964e744a450.1632516769.git.asml.silence@gmail.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.
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.