Re: Is tools/testing/selftests/bpf/ maintained?

[Eduard Zingerman <eddyz87@gmail.com>]

On Thu, 2023-10-12 at 22:39 +0900, Tetsuo Handa wrote:
> Hello.
> 
> I'm having problem with finding BPF LSM examples that work.
> I tried building tools/testing/selftests/bpf/progs/lsm.c and
> tools/testing/selftests/bpf/prog_tests/test_lsm.c explained at
> https://docs.kernel.org/bpf/prog_lsm.html , but got a lot of errors.

Hello,

> Is tools/testing/selftests/bpf/ maintained?

It pretty much is, build it every day :)
And we have a CI too: https://github.com/kernel-patches/bpf .

I tried setting up a minimal Debian chroot to showcase the build
and came up with the following list of commands:

# Use trixie to get llvm-16
sudo /usr/sbin/debootstrap --variant=buildd --arch=amd64 trixie trixie-chroot/ http://deb.debian.org/debian
# don't forget to umount with 'umount -R ...'
sudo mount --rbind /dev/pts trixie-chroot/dev/pts
sudo mount -t proc proc trixie-chroot/proc
sudo chroot trixie-chroot

# The reset of commands are from chroot itself, first as root
apt install build-essential llvm clang lld bc flex bison pahole git \
    libelf-dev libssl-dev docutils-common rsync
# Note: you might want to build pahole from source
useradd -d /home/eddy -s /bin/bash eddy
mkdir /home/eddy
chown eddy /home/eddy
su eddy

# Now as a user 'eddy':
cd /home/eddy
git clone https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux.git
cd linux/
./scripts/kconfig/merge_config.sh tools/testing/selftests/bpf/config tools/testing/selftests/bpf/config.x86_64
# Note: kernel build is mandatory, as vmlinux.h is constructed from DWARF in ./vmlinux
make -j14
make -j14 headers
make -j14 -C tools/testing/selftests/bpf/

Hope this helps,
Eduard