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b4ccc4dd13
1 usec is not as short as it used to be, and it makes sense to allow 0 for a busy poll timeout - this means just do one loop to check if we have anything available. Add a separate ->napi_enabled to check if napi has been enabled or not. While at it, move the writing of the ctx napi values after we've copied the old values back to userspace. This ensures that if the call fails, we'll be in the same state as we were before, rather than some indeterminate state. 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.