I'd like to change the default RPi 3B+ kernel to use the version 5.10 with the rt_preempt patch. To accomplish this, I'm trying to follow this guide and the official Raspberry guide, adapting some steps to apply the newer version of the kernel (I'm currently building the kernel on WSL1 with Ubuntu 18.04):
Install required tools:
sudo apt install git build-essential libncurses5-dev bc bison flex libssl-dev make libc6-dev sudo apt install crossbuild-essential-armhf
Clone kernel repository:
git clone -b 'rpi-5.10.y' --depth 1 https://github.com/raspberrypi/linux.git
Download patch:
wget https://mirrors.edge.kernel.org/pub/linux/kernel/projects/rt/5.10/patch-5.10.65-rt53.patch.xz
Setup ENV variables in the file
setup.sh
:export KERNEL=kernel7 export ARCH=arm export CROSS_COMPILE=arm-linux-gnueabihf- bcm2709_defconfig export CONCURRENCY_LEVEL=2 export INSTALL_MOD_PATH=mnt/d
Apply the patch:
cd linux xzcat ../patch-5.10.65-rt53.patch.xz | patch -p1
At this point I have some errors in the patching log:
patching file include/linux/local_lock_internal.h
Hunk #1 FAILED at 7.
Hunk #2 FAILED at 21.
Hunk #3 FAILED at 47.
Hunk #4 succeeded at 59 (offset -7 lines).
Hunk #5 succeeded at 77 (offset -7 lines).
Hunk #6 succeeded at 88 (offset -7 lines).
3 out of 6 hunks FAILED -- saving rejects to file include/linux/local_lock_internal.h.rej
and:
patching file kernel/cgroup/cpuset.c
Hunk #2 succeeded at 1280 (offset -2 lines).
Hunk #3 FAILED at 1304.
Hunk #4 succeeded at 1404 with fuzz 1 (offset -3 lines).
Hunk #5 FAILED at 1441.
Hunk #6 succeeded at 1553 (offset -6 lines).
Hunk #7 succeeded at 1564 (offset -6 lines).
Hunk #8 succeeded at 1758 (offset -6 lines).
Hunk #9 succeeded at 1828 (offset -6 lines).
Hunk #10 succeeded at 1921 (offset -6 lines).
Hunk #11 FAILED at 2020.
Hunk #12 succeeded at 2432 (offset -6 lines).
Hunk #13 succeeded at 2454 (offset -6 lines).
Hunk #14 succeeded at 2767 (offset -6 lines).
Hunk #15 succeeded at 2801 (offset -6 lines).
Hunk #16 succeeded at 2862 (offset -6 lines).
Hunk #17 succeeded at 2873 (offset -6 lines).
Hunk #18 succeeded at 2970 (offset -6 lines).
Hunk #19 succeeded at 3012 (offset -6 lines).
Hunk #20 FAILED at 3088.
Hunk #21 FAILED at 3105.
Hunk #22 succeeded at 3170 (offset -17 lines).
Hunk #23 succeeded at 3190 (offset -17 lines).
Hunk #24 succeeded at 3301 (offset -17 lines).
Hunk #25 succeeded at 3366 (offset -17 lines).
Hunk #26 succeeded at 3462 (offset -17 lines).
5 out of 26 hunks FAILED -- saving rejects to file kernel/cgroup/cpuset.c.rej
From here I don't know how to solve the problem. This is the fist time I'm dealing with kernel compilation and I'm not sure if the problem may be related to the patch compatibility/version, to some compilation settings or other stuff. Is it possible to solve this issue?