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
Jens Axboe
authored
We can't currently tell if ->msg_inq was set when we ask for msg_get_inq,
initialize it to -1U so we can tell apart if it was set and there's
no data left, or if it just wasn't set at all by the protocol.
Signed-off-by: 
Jens Axboe <axboe@kernel.dk>