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If someone includes linux/tty_flip.h before linux/tty.h, they see many compiler errors like: include/linux/tty_flip.h:23:30: error: invalid use of undefined type 'struct tty_port' include/linux/tty_flip.h:26:14: error: invalid use of undefined type 'struct tty_buffer' tty_flip.h actually lexicographically sorts before tty.h. So if people sort includes (as I tried in amiserial), the compilation suddenly breaks. Solve this by including linux/tty.h from linux/tty_flip.h, so that everything is defined as needed. Another alternative would be to uninline tty_insert_flip_char and just insert forward declarations of tty_port and tty_buffer structs into tty_flip.h as that inline is the only real user. But that would mean slowing down the fast path without any good reason. (Provided the fix is that easy and there were no real problems with this until now.) Signed-off-by: Jiri Slaby <jslaby@suse.cz> Link: https://lore.kernel.org/r/20210625073511.4514-1-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.