linux-kernel - Re: [PATCH 6/9] kbuild: refactor scripts/Makefile.modinst

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Date:   Wed, 12 May 2021 16:23:46 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Masahiro Yamada <masahiroy@...nel.org>,
        linux-kbuild@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Michal Marek <michal.lkml@...kovi.net>
Subject: Re: [PATCH 6/9] kbuild: refactor scripts/Makefile.modinst

Hi,

So I'm not *entirely* sure if this caused it, but I noticed that doing

	make -C linux M=/path/to/extmod/ modules_install

stopped working.

This is because here:
> 
> -extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
> +export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)


(as before, of course) another trailing / is added to the M= argument,
and then

> +modules := $(patsubst $(extmod_prefix)%, $(dst)/%, $(modules))

this patsubst turns out to do nothing. So $(modules) contains the
original paths where the modules were compiled, and consequently nothing
happens.

Specifying

	make -C linux M=/path/to/extmod modules_install

actually works.


Obviously I can work around it, but it hardly seems intentional?

Thanks,
johannes