linux-kernel - [PATCH kmod v5 0/5] kmod /usr support

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Message-ID: <cover.1689681454.git.msuchanek@suse.de>
Date:   Tue, 18 Jul 2023 14:01:51 +0200
From:   Michal Suchanek <msuchanek@...e.de>
To:     linux-modules@...r.kernel.org
Cc:     Michal Suchanek <msuchanek@...e.de>, 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>,
        Masahiro Yamada <masahiroy@...nel.org>,
        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: [PATCH kmod v5 0/5] kmod /usr support

Hello,

with these patches it is possible to install kernel modules in an arbitrary
directory - eg. moving the /lib/modules to /usr/lib/modules or /opt/linux.

While the modprobe.d and depmod.d search which already includes multiple
paths is expanded to also include $(prefix) the module directory still
supports only one location, only a different one under $(module_directory).

Having kmod search multiple module locations while only one is supported now
might break some assumption about relative module path corresponding to a
specific file, would require more invasive changes to implement, and is not
supportive of the goal of moving the modules away from /lib.

Both kmod and the kernel need to be patched to make use of this feature.
Patched kernel is backwards compatible with older kmod.  Patched kmod
with $(module_directory) set to /lib/modules is equivalent to unpatched kmod.

Thanks

Michal

Link: https://lore.kernel.org/linux-modules/20210112160211.5614-1-msuchanek@suse.de/

v4: set whole path to module directory instead of adding prefix
v5: use pkg-config instead of jq, fix build on openssl without sm3 support


Michal Suchanek (5):
  configure: Detect openssl sm3 support
  man/depmod.d: Fix incorrect /usr/lib search path
  libkmod, depmod: Load modprobe.d, depmod.d from ${prefix}/lib.
  kmod: Add pkgconfig file with kmod compile time configuration
  libkmod, depmod, modprobe: Make directory for kernel modules
    configurable

 Makefile.am                          |   6 +-
 configure.ac                         |  30 ++++++++
 libkmod/libkmod.c                    |  11 +--
 man/Makefile.am                      |  10 ++-
 man/depmod.d.xml                     |   9 ++-
 man/depmod.xml                       |   4 +-
 man/modinfo.xml                      |   2 +-
 man/modprobe.d.xml                   |   1 +
 man/modprobe.xml                     |   2 +-
 man/modules.dep.xml                  |   6 +-
 testsuite/module-playground/Makefile |   2 +-
 testsuite/setup-rootfs.sh            | 109 +++++++++++++++------------
 testsuite/test-depmod.c              |  16 ++--
 testsuite/test-testsuite.c           |   8 +-
 tools/depmod.c                       |   7 +-
 tools/kmod.pc.in                     |  10 +++
 tools/modinfo.c                      |   4 +-
 tools/modprobe.c                     |   4 +-
 tools/static-nodes.c                 |   6 +-
 19 files changed, 156 insertions(+), 91 deletions(-)
 create mode 100644 tools/kmod.pc.in

-- 
2.41.0