linux-kernel - Re: [PATCH v6 1/2] depmod: Handle installing modules under a different directory

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Date:   Mon, 11 Dec 2023 03:43:44 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Michal Suchanek <msuchanek@...e.de>
Cc:     linux-modules@...r.kernel.org, Takashi Iwai <tiwai@...e.com>,
        Lucas De Marchi <lucas.de.marchi@...il.com>,
        Michal Koutný <mkoutny@...e.com>,
        Jiri Slaby <jslaby@...e.com>, Jan Engelhardt <jengelh@...i.de>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 1/2] depmod: Handle installing modules under a
 different directory

On Thu, Dec 7, 2023 at 4:48 AM Michal Suchanek <msuchanek@...e.de> wrote:
>
> Some distributions aim at shipping all files in /usr.
>
> The path under which kernel modules are installed is hardcoded to /lib
> which conflicts with this goal.
>
> When kmod provides kmod.pc, use it to determine the correct module
> installation path.
>
> With kmod that does not provide the config /lib/modules is used as
> before.
>
> While pkg-config does not return an error when a variable does not exist
> the kmod configure script puts some effort into ensuring that
> module_directory is non-empty. With that empty module_directory from
> pkg-config can be used to detect absence of the variable.
>
> Signed-off-by: Michal Suchanek <msuchanek@...e.de>
> ---
> v6:
>  - use ?= instead of := to make it easier to override the value


"KERNEL_MODULE_DIRECTORY=/local/usr/lib/modules make modules_install"
will override the install destination, but
depmod will not be not aware of it.

How to avoid the depmod error?














>  - use shorter expression for determining the module directory assuming
>    it's non-empty
> ---
>  Makefile | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/Makefile b/Makefile
> index 511b5616aa41..84f32bd563d4 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1081,7 +1081,9 @@ export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
>  # makefile but the argument can be passed to make if needed.
>  #
>
> -MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
> +export KERNEL_MODULE_DIRECTORY ?= $(or $(shell pkg-config --variable=module_directory kmod 2>/dev/null),/lib/modules)
> +
> +MODLIB = $(INSTALL_MOD_PATH)$(KERNEL_MODULE_DIRECTORY)/$(KERNELRELEASE)
>  export MODLIB
>
>  PHONY += prepare0
> --
> 2.42.0
>
>


--
Best Regards
Masahiro Yamada