8fad7767ed
New helper: append_pipe(). Extends the last buffer if possible, allocates a new one otherwise. Returns page and offset in it on success, NULL on failure. iov_iter is advanced past the data we've got. Use that instead of push_pipe() in copy-to-pipe primitives; they get simpler that way. Handling of short copy (in "mc" one) is done simply by iov_iter_revert() - iov_iter is in consistent state after that one, so we can use that. [Fix for braino caught by Liu Xinpeng <liuxp11@chinatelecom.cn> folded in] [another braino fix, this time in copy_pipe_to_iter() and pipe_zero(); caught by testcase from Hugh Dickins] Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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.