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When Make recurses to the top Makefile with sub-make-done unset, the code block surrounded by 'ifneq ($(sub-make-done),1) ... endif' is parsed multiple times. This happens for in-tree building of include/config/auto.conf, *-pkg, etc. with GNU Make 4.x. This is a slight regression by commit688931a5ad("kbuild: skip sub-make for in-tree build with GNU Make 4.x") in terms of performance since that code block contains one $(shell ...) invocation. Fix it by exporting the variable irrespective of sub-make being run. I renamed it because GNU Make cannot properly export variables containing hyphens. This is probably a bug of GNU Make, and the issue in Kbuild had already been reported by commit2bfbe7881e("kbuild: Do not use hyphen in exported variable name"). 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.