Add build-scx-selftests action

build-linux/build.sh

@@ -30,6 +30,7 @@ cat_kernel_config() {
 	cat ${GITHUB_WORKSPACE}/tools/testing/selftests/bpf/config \
 	    ${GITHUB_WORKSPACE}/tools/testing/selftests/bpf/config.vm \
 	    ${GITHUB_WORKSPACE}/tools/testing/selftests/bpf/config.${TARGET_ARCH} \
+            ${GITHUB_WORKSPACE}/tools/testing/selftests/sched_ext/config \
 	    ${GITHUB_WORKSPACE}/ci/vmtest/configs/config \
 	    ${GITHUB_WORKSPACE}/ci/vmtest/configs/config.${TARGET_ARCH} 2> /dev/null > "${1}"
 }

build-scx-selftests/README.md

@@ -0,0 +1,20 @@
+# Build selftests/sched_ext
+
+This action builds selftests/sched_ext given a kernel build
+output. Kernel build configuration is supposed to include necessary
+flags (i.e. `tools/testing/selftests/sched_ext/config`).
+
+The action is expected to be executed by a workflow with access to the
+Linux kernel repository.
+
+## Required inputs
+
+* `kbuild-output` - Path to the kernel build output.
+* `repo-root` - Path to the root of the Linux kernel repository.
+* `arch` - Kernel build architecture.
+* `toolchain` - Toolchain name: `gcc` (default) or `llvm`.
+
+## Optional inputs
+* `llvm-version` - LLVM version, used when `toolchain` is `llvm`. Default: `16`.
+* `max-make-jobs` - Maximum number of jobs to use when running make (e.g argument to -j). Default: 4*nproc.
+

build-scx-selftests/action.yml

@@ -0,0 +1,34 @@
+name: 'Build selftests/sched_ext'
+inputs:
+  kbuild-output:
+    description: 'Path to the kernel build output'
+    required: true
+  repo-root:
+    description: "Path to the root of the kernel repository"
+    required: true
+  arch:
+    description: 'arch'
+    required: true
+  toolchain:
+    description: 'gcc or llvm'
+    default: 'gcc'
+    required: true
+  llvm-version:
+    description: 'llvm version'
+    required: false
+    default: '16'
+  max-make-jobs:
+    description: 'Maximum number of jobs to use when running make (e.g argument to -j). Default: 4*nproc'
+    default: ''
+
+runs:
+  using: "composite"
+  steps:
+    - name: Build selftests/sched_ext
+      env:
+        KBUILD_OUTPUT: ${{ inputs.kbuild-output }}
+        MAX_MAKE_JOBS: ${{ inputs.max-make-jobs }}
+        REPO_ROOT: ${{ inputs.repo-root || github.workspace }}
+      shell: bash
+      run:
+        ${GITHUB_ACTION_PATH}/build.sh "${{ inputs.arch }}" "${{ inputs.toolchain }}" "${{ inputs.llvm-version }}"

build-scx-selftests/build.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+
+set -euo pipefail
+
+source "${GITHUB_ACTION_PATH}/../helpers.sh"
+
+TARGET_ARCH=$1
+TOOLCHAIN=$2
+LLVM_VERSION=$3
+
+ARCH="$(platform_to_kernel_arch ${TARGET_ARCH})"
+CROSS_COMPILE=""
+
+if [[ "${TARGET_ARCH}" != "$(uname -m)" ]]
+then
+	CROSS_COMPILE="${TARGET_ARCH}-linux-gnu-"
+fi
+
+if [[ $TOOLCHAIN = "llvm" ]]; then
+	export LLVM="-$LLVM_VERSION"
+	TOOLCHAIN="llvm-$LLVM_VERSION"
+fi
+
+foldable start build_selftests "Building selftests/sched_ext with $TOOLCHAIN"
+
+MAKE_OPTS=$(cat <<EOF
+	ARCH=${ARCH}
+	CROSS_COMPILE=${CROSS_COMPILE}
+	CLANG=clang-${LLVM_VERSION}
+	LLC=llc-${LLVM_VERSION}
+	LLVM_STRIP=llvm-strip-${LLVM_VERSION}
+	VMLINUX_BTF=${KBUILD_OUTPUT}/vmlinux
+EOF
+)
+SELF_OPTS=$(cat <<EOF
+	-C ${REPO_ROOT}/tools/testing/selftests/sched_ext
+EOF
+)
+
+cd ${REPO_ROOT}
+make ${MAKE_OPTS} ${SELF_OPTS} clean
+make ${MAKE_OPTS} ${SELF_OPTS} -j $(kernel_build_make_jobs)
+
+foldable end build_selftests
+