Nicholas Redi's questions

I just recompiled the Ubuntu Jammy HWE kernel 6.8.0-45 using these steps:

# Clone Ubuntu stock Kernel repo
git clone git://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/jammy
cd jammy
git checkout Ubuntu-hwe-6.8-6.8.0-45.45_22.04.1
# Build deps
sudo apt build-dep linux linux-image-unsigned-`uname -r`
sudo apt install build-essential libncurses-dev bison flex libssl-dev libelf-dev fakeroot libncurses-dev gawk flex bison openssl libssl-dev dkms libelf-dev libudev-dev libpci-dev libiberty-dev autoconf llvm dwarves
# Clean all
fakeroot debian/rules clean && make ARCH=x86 mrproper && git clean -fd && git restore . && git clean -fd && git restore .
# do custom changes
code debian.hwe-6.8/changelog # Append custom version
code include/linux/uts.h # Modify UTS_SYSNAME
# Update Debian configs
chmod a+x debian/rules && chmod a+x debian/scripts/* && chmod a+x debian/scripts/misc/*
fakeroot debian/rules clean
fakeroot debian/rules editconfigs
# Start build
fakeroot debian/rules binary-headers binary-generic

I was wondering on how can I just recompile the single 'iwlwifi.ko' module without re-compile the whole kernel.

I tried to perform standard recompilation from the root of kernel sources by running:

make -j$(nproc) M=drivers/net/wireless/intel/iwlwifi modules

But when tying to insert this I get:

> sudo insmod drivers/net/wireless/intel/iwlwifi/iwlwifi.ko
insmod: ERROR: could not insert module drivers/net/wireless/intel/iwlwifi/iwlwifi.ko: Invalid parameters

And dmesg says:

[10754.522405] BPF: [139328] ENUM x509_key_exit 
[10754.522410] BPF: size=4 vlen=34
[10754.522410] BPF:  
[10754.522411] BPF: Invalid name
[10754.522412] BPF: 
[10754.522413] failed to validate module [iwlwifi] BTF: -22

I guess there must be a way to exploit the fakeroot debian/rules mechanism for just re-compile a single module without clean everything all and build the whole kernel again.

Thank you for support.

I’m currently trying to compile a custom Ubuntu Jammy (22.04) HWE kernel, version 6.8.0-45, by following a procedure similar to the one mentioned here. I’m applying some patches to the iwlwifi driver.

Here’s my step-by-step process:

1. git clone git://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/jammy && cd jammy
2. git checkout Ubuntu-hwe-6.8-6.8.0-45.45_22.04.1
3. git switch -c my_branch/6.8.0-45_iwl_patch
4. Apply my changes to drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c file
5. git add . && git commit -m "My commit message"
6. cp /boot/config-$(uname -r) .config
7. sed -i 's/CONFIG_LOCALVERSION=""/CONFIG_LOCALVERSION="-ricciolino"/g' .config
8. make oldconfig
9. fakeroot debian/rules clean
10. fakeroot debian/rules binary-headers binary-generic

Everything works fine until step 10, where I encounter the following error during the build process:

(my_branch/6.8.0-45_iwl_patch)> fakeroot debian/rules binary-headers binary-generic
Debug: /opt/my-kernel/jammy/debian/stamps/stamp-prepare-indep
dh_prep -i
[ -d /opt/my-kernel/jammy/debian/stamps/ ] || mkdir /opt/my-kernel/jammy/debian/stamps/; touch /opt/my-kernel/jammy/debian/stamps/stamp-prepare-indep
Debug: /opt/my-kernel/jammy/debian/stamps/stamp-install-headers
dh_testdir
install -d /opt/my-kernel/jammy/debian/linux-hwe-6.8-headers-6.8.0-45/usr/src/linux-hwe-6.8-headers-6.8.0-45
find . -path './debian' -prune -o -path './debian.hwe-6.8' -prune \
  -o -path './include/*' -prune \
  -o -path './scripts/*' -prune -o -type f \
  \( -name 'Makefile*' -o -name 'Kconfig*' -o -name 'Kbuild*' -o \
     -name '*.sh' -o -name '*.pl' -o -name '*.lds' \) \
  -print | cpio -pd --preserve-modification-time /opt/my-kernel/jammy/debian/linux-hwe-6.8-headers-6.8.0-45/usr/src/linux-hwe-6.8-headers-6.8.0-45
27658 blocks
cp -a scripts include /opt/my-kernel/jammy/debian/linux-hwe-6.8-headers-6.8.0-45/usr/src/linux-hwe-6.8-headers-6.8.0-45
(find arch -name include -type d -print | \
        xargs -n1 -i: find : -type f) | \
        cpio -pd --preserve-modification-time /opt/my-kernel/jammy/debian/linux-hwe-6.8-headers-6.8.0-45/usr/src/linux-hwe-6.8-headers-6.8.0-45
xargs: warning: options --max-args and --replace/-I/-i are mutually exclusive, ignoring previous --max-args value
cpio: /opt/my-kernel/jammy/debian/linux-hwe-6.8-headers-6.8.0-45/usr/src/linux-hwe-6.8-headers-6.8.0-45/arch/powerpc/include/uapi/asm/Kbuild not created: newer or same age version exists
...
<more cpio lines>
...
cpio: /opt/my-kernel/jammy/debian/linux-hwe-6.8-headers-6.8.0-45/usr/src/linux-hwe-6.8-headers-6.8.0-45/arch/x86/include/asm/Kbuild not created: newer or same age version exists
28358 blocks
# Do not ship .o and .cmd artifacts in headers
find /opt/my-kernel/jammy/debian/linux-hwe-6.8-headers-6.8.0-45/usr/src/linux-hwe-6.8-headers-6.8.0-45 -name \*.o -or -name \*.cmd -exec rm -f {} \;
[ -d /opt/my-kernel/jammy/debian/stamps/ ] || mkdir /opt/my-kernel/jammy/debian/stamps/; touch /opt/my-kernel/jammy/debian/stamps/stamp-install-headers
Debug: binary-headers
dh_installchangelogs -plinux-hwe-6.8-headers-6.8.0-45
dh_installdocs -plinux-hwe-6.8-headers-6.8.0-45
dh_compress -plinux-hwe-6.8-headers-6.8.0-45
dh_fixperms -plinux-hwe-6.8-headers-6.8.0-45
dh_installdeb -plinux-hwe-6.8-headers-6.8.0-45
flock -w 60 /opt/my-kernel/jammy/debian/.LOCK dh_gencontrol -plinux-hwe-6.8-headers-6.8.0-45
dh_md5sums -plinux-hwe-6.8-headers-6.8.0-45
dh_builddeb -plinux-hwe-6.8-headers-6.8.0-45
dpkg-deb: building package 'linux-hwe-6.8-headers-6.8.0-45' in '../linux-hwe-6.8-headers-6.8.0-45_6.8.0-45.45~22.04.1_all.deb'.
x86_64-linux-gnu-gcc-12 debian/scripts/fix-filenames.c -o debian/scripts/fix-filenames
Debug: /opt/my-kernel/jammy/debian/stamps/stamp-prepare-tree-generic
install -d /opt/my-kernel/jammy/debian/build/build-generic
touch /opt/my-kernel/jammy/debian/build/build-generic/ubuntu-build
python3 debian/scripts/misc/annotations --export --arch amd64 --flavour generic > /opt/my-kernel/jammy/debian/build/build-generic/.config
sed -i 's/.*CONFIG_VERSION_SIGNATURE.*/CONFIG_VERSION_SIGNATURE="Ubuntu 6.8.0-45.45~22.04.1-generic 6.8.12"/' /opt/my-kernel/jammy/debian/build/build-generic/.config
find /opt/my-kernel/jammy/debian/build/build-generic -name "*.ko" | xargs rm -f
make ARCH=x86 CROSS_COMPILE=x86_64-linux-gnu- HOSTCC=x86_64-linux-gnu-gcc-12 CC=x86_64-linux-gnu-gcc-12 BINDGEN=bindgen-0.65 KERNELRELEASE=6.8.0-45-generic CONFIG_DEBUG_SECTION_MISMATCH=y KBUILD_BUILD_VERSION="45~22.04.1" CFLAGS_MODULE="-DPKG_ABI=45" PYTHON=python3 O=/opt/my-kernel/jammy/debian/build/build-generic -j24 rustavailable || true
make[1]: Entering directory '/opt/my-kernel/jammy'
make[2]: Entering directory '/opt/my-kernel/jammy/debian/build/build-generic'
***
*** Rust bindings generator 'bindgen-0.65' could not be found.
***
***
*** Please see Documentation/rust/quick-start.rst for details
*** on how to set up the Rust support.
***
make[3]: *** [/opt/my-kernel/jammy/Makefile:1718: rustavailable] Error 1
make[2]: *** [/opt/my-kernel/jammy/Makefile:240: __sub-make] Error 2
make[2]: Leaving directory '/opt/my-kernel/jammy/debian/build/build-generic'
make[1]: *** [Makefile:240: __sub-make] Error 2
make[1]: Leaving directory '/opt/my-kernel/jammy'
make ARCH=x86 CROSS_COMPILE=x86_64-linux-gnu- HOSTCC=x86_64-linux-gnu-gcc-12 CC=x86_64-linux-gnu-gcc-12 BINDGEN=bindgen-0.65 KERNELRELEASE=6.8.0-45-generic CONFIG_DEBUG_SECTION_MISMATCH=y KBUILD_BUILD_VERSION="45~22.04.1" CFLAGS_MODULE="-DPKG_ABI=45" PYTHON=python3 O=/opt/my-kernel/jammy/debian/build/build-generic -j24 olddefconfig
make[1]: Entering directory '/opt/my-kernel/jammy'
make[2]: Entering directory '/opt/my-kernel/jammy/debian/build/build-generic'
***
*** The source tree is not clean, please run 'make ARCH=x86 mrproper'
*** in /opt/my-kernel/jammy
***
make[3]: *** [/opt/my-kernel/jammy/Makefile:646: outputmakefile] Error 1
make[2]: *** [/opt/my-kernel/jammy/Makefile:240: __sub-make] Error 2
make[2]: Leaving directory '/opt/my-kernel/jammy/debian/build/build-generic'
make[1]: *** [Makefile:240: __sub-make] Error 2
make[1]: Leaving directory '/opt/my-kernel/jammy'
make: *** [debian/rules.d/2-binary-arch.mk:23: /opt/my-kernel/jammy/debian/stamps/stamp-prepare-tree-generic] Error 2

What is wrong ?

Thanks for suppoort

I already read similar post, like this or this.

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EDIT: attached image of the error

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lsb_release -a

No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 18.04.5 LTS Release: 18.04 Codename: bionic

uname -a

Linux ricciolino-XPS-15-9570 5.4.0-54-generic #60~18.04.1-Ubuntu SMP Fri Nov 6 17:25:16 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

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