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This '+' was added a long time ago: | commit c23e6bf05f7802e92fd3da69a1ed35e56f9c85bb (HEAD) | Author: Kai Germaschewski <kai@tp1.ruhr-uni-bochum.de> | Date: Mon Oct 28 01:16:34 2002 -0600 | | kbuild: Fix a "make -j<N>" warning | | diff --git a/scripts/Makefile.clean b/scripts/Makefile.clean | index 2c843e0380bc..e7c392fd5788 100644 | --- a/scripts/Makefile.clean | +++ b/scripts/Makefile.clean | @@ -42,7 +42,7 @@ quiet_cmd_clean = CLEAN $(obj) | | __clean: $(subdir-ymn) | ifneq ($(strip $(__clean-files) $(clean-rule)),) | - $(call cmd,clean) | + +$(call cmd,clean) | else | @: | endif At that time, cmd_clean contained $(clean-rule), which was able to invoke sub-make. That was why cleaning with the -j option showed: warning: jobserver unavailable: using -j1. Add '+' to parent make rule. It is not the case any more; cmd_clean now just runs the 'rm' command. The '+' marker is pointless. 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.