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b999923c29
The previous commit made 'MAKEFLAGS += -rR' effective in the top Makefile regardless of O= option, GNU Make versions. The top Makefile does not need to cancel implicit rules for makefiles. There is still one place where an empty rule is useful. Since -rR is effective only after sub-make, GNU Make would try implicit rules to update the top Makefile. Although it is not a big overhead, cancel it just in case. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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.