linux-kernel - Re: [PATCH v2--to=linux-modules@...r.kernel.org] depmod: Handle installing modules under a prefix

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Message-ID: <CAK7LNATRikmr5bO9WvWAvqHFmkv1sqAPY_WouXb4+6HCTj56MQ@mail.gmail.com>
Date:   Wed, 12 Jul 2023 23:14:33 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Michal Suchanek <msuchanek@...e.de>
Cc:     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 v2--to=linux-modules@...r.kernel.org] depmod: Handle
 installing modules under a prefix

On Wed, Jul 12, 2023 at 10:45 PM Michal Suchanek <msuchanek@...e.de> wrote:
>
> Some distributions aim at not shipping any files in / ustside of usr.
>
> The path under which kernel modules are instaleld is hardcoded to /lib
> which conflicts with this goal.
>
> When kmod provides the config command use it to determine the correct
> module installation prefix.
>
> On kmod that does not provide the command / is used as before.
>
> Signed-off-by: Michal Suchanek <msuchanek@...e.de>
> ---
> v2: Avoid error on systems with kmod that does not support config
> command
> ---
>  Makefile          | 4 +++-
>  scripts/depmod.sh | 8 ++++----
>  2 files changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index 47690c28456a..b1fea135bdec 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1165,7 +1165,9 @@ 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_PREFIX := $(shell kmod config &> /dev/null && kmod config | jq -r .module_prefix)
> +
> +MODLIB = $(INSTALL_MOD_PATH)$(KERNEL_MODULE_PREFIX)/lib/modules/$(KERNELRELEASE)



You can do "make modules_install INSTALL_MOD_PATH=/usr/what/ever/prefix"


This patch is unneeded.












>  export MODLIB
>
>  PHONY += prepare0
> diff --git a/scripts/depmod.sh b/scripts/depmod.sh
> index 3643b4f896ed..88ac79056153 100755
> --- a/scripts/depmod.sh
> +++ b/scripts/depmod.sh
> @@ -27,16 +27,16 @@ fi
>  # numbers, so we cheat with a symlink here
>  depmod_hack_needed=true
>  tmp_dir=$(mktemp -d ${TMPDIR:-/tmp}/depmod.XXXXXX)
> -mkdir -p "$tmp_dir/lib/modules/$KERNELRELEASE"
> +mkdir -p "$tmp_dir$KERNEL_MODULE_PREFIX/lib/modules/$KERNELRELEASE"
>  if "$DEPMOD" -b "$tmp_dir" $KERNELRELEASE 2>/dev/null; then
> -       if test -e "$tmp_dir/lib/modules/$KERNELRELEASE/modules.dep" -o \
> -               -e "$tmp_dir/lib/modules/$KERNELRELEASE/modules.dep.bin"; then
> +       if test -e "$tmp_dir$KERNEL_MODULE_PREFIX/lib/modules/$KERNELRELEASE/modules.dep" -o \
> +               -e "$tmp_dir$KERNEL_MODULE_PREFIX/lib/modules/$KERNELRELEASE/modules.dep.bin"; then
>                 depmod_hack_needed=false
>         fi
>  fi
>  rm -rf "$tmp_dir"
>  if $depmod_hack_needed; then
> -       symlink="$INSTALL_MOD_PATH/lib/modules/99.98.$KERNELRELEASE"
> +       symlink="$INSTALL_MOD_PATH$KERNEL_MODULE_PREFIX/lib/modules/99.98.$KERNELRELEASE"
>         ln -s "$KERNELRELEASE" "$symlink"
>         KERNELRELEASE=99.98.$KERNELRELEASE
>  fi
> --
> 2.41.0
>


-- 
Best Regards
Masahiro Yamada