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74ee585b7e
M= (or KBUILD_EXTMOD) generally expects a directory path without any trailing slashes, like M=a/b/c. If you add a trailing slash, like M=a/b/c/, you will get ugly build logs (two slashes in a series), but it still works fine as long as it is consistent between 'make modules' and 'make modules_install'. The following commands correctly build and install the modules. $ make M=a/b/c/ modules $ sudo make M=a/b/c/ modules_install Since commitccae4cfa7b("kbuild: refactor scripts/Makefile.modinst"), a problem happens if you add a trailing slash only for modules_install. $ make M=a/b/c modules $ sudo make M=a/b/c/ modules_install No module is installed in this case, Johannes Berg reported. [1] Trim any trailing slashes from $(KBUILD_EXTMOD). I used the 'dirname' command to remove all the trailing slashes in case someone adds more slashes like M=a/b/c/////. The Make's built-in function, $(dir ...) cannot take care of such a case. [1]: https://lore.kernel.org/lkml/10cc8522b27a051e6a9c3e158a4c4b6414fd04a0.camel@sipsolutions.net/ Fixes:ccae4cfa7b("kbuild: refactor scripts/Makefile.modinst") Reported-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: Masahiro Yamada <masahiroy@kernel.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.