older kernels can't be compiled with new pahole: use 2 versions

testing/kernel_builder/Dockerfile.old

@@ -0,0 +1,10 @@
+from debian:bullseye
+
+RUN dpkg --add-architecture arm64
+RUN apt-get -y update
+RUN apt-get -y install \
+        git gcc make libssl-dev bison flex bc libelf-dev python3 \
+        gcc-aarch64-linux-gnu curl xz-utils dwarves
+
+WORKDIR /work
+CMD ./build.sh

testing/kernel_builder/Makefile

@@ -4,7 +4,9 @@ IMAGE=kernel-builder-local
 TAG=latest
 
 all:
-	${CONTAINER_ENGINE} run -v ${PWD}:/work ${IMAGE}:${TAG}
+	${CONTAINER_ENGINE} run -v ${PWD}:/work ${IMAGE}-old:${TAG}
+	${CONTAINER_ENGINE} run -v ${PWD}:/work ${IMAGE}-new:${TAG}
 
 image:
-	${CONTAINER_ENGINE} build . -t ${IMAGE}:${TAG}
+	${CONTAINER_ENGINE} build -f Dockerfile.old -t ${IMAGE}-old:${TAG}
+	${CONTAINER_ENGINE} build -f Dockerfile.new -t ${IMAGE}-new:${TAG}

testing/kernel_builder/build.sh

@@ -18,7 +18,7 @@ readonly BUILD_ARCHES=(
 
 # We hit every minor release here, and grab a number of different patch
 # releases from each LTS series (e.g. 5.10, 5.15)
-readonly BUILD_VERSIONS=(
+readonly BUILD_VERSIONS_PAHOLE_120=(
     "5.10.16" # Oldest we support
     "5.10.130"
     "5.11"
@@ -34,6 +34,9 @@ readonly BUILD_VERSIONS=(
     "6.0"
     "6.1"
     "6.1.55"
+)
+
+readonly BUILD_VERSIONS_PAHOLE_SOURCE=(
     "6.2"
     "6.3"
     "6.4"
@@ -101,9 +104,15 @@ fetch_and_build() {
 }
 
 main() {
-    for version in ${BUILD_VERSIONS[@]}; do
-        fetch_and_build $version
-    done
+    if [ "$(pahole --version)" = "v1.20" ]; then
+        for version in ${BUILD_VERSIONS_PAHOLE_120[@]}; do
+            fetch_and_build $version
+        done
+    else
+        for version in ${BUILD_VERSIONS_PAHOLE_SOURCE[@]}; do
+            fetch_and_build $version
+        done
+    fi
 }
 
 main