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Tue, 21 Jul 2026 10:48:36 -0700 (PDT) Received: from localhost ([2a03:2880:9ff:68::]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-13ce29c2c93sm47964768c88.3.2026.07.21.10.48.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Jul 2026 10:48:36 -0700 (PDT) From: Ziyang Men To: Shuah Khan , Tejun Heo , Johannes Weiner , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Jiri Kosina , Benjamin Tissoires , David Vernet , Eduard Zingerman Cc: Andrea Righi , Changwoo Min , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Andrew Morton , JP Kobryn , Mykola Lysenko , Nathan Chancellor , linux-kselftest@vger.kernel.org, cgroups@vger.kernel.org, linux-input@vger.kernel.org, sched-ext@lists.linux.dev, linux-mm@kvack.org, kernel-team@meta.com, bpf@vger.kernel.org, llvm@lists.linux.dev, linux-kernel@vger.kernel.org, Ziyang Men Subject: [PATCH v2 0/4] selftests: shared lib.bpf.mk for building BPF progs and skeletons Date: Tue, 21 Jul 2026 10:48:29 -0700 Message-ID: <20260721174833.1232771-1-ziyang.meme@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series re-factors the bpf-related toolchain for selftests, which currently duplicated across selftests/{bpf,sched_ext,hid}/. Unify them into a single includable fragment, tools/testing/selftests/lib.bpf.mk, and wires up three consumers. We believe this will simplify the work for configuraing selftests with the bpf, for both the existing and future ones. Patch 1 adds lib.bpf.mk: it builds the in-tree libbpf.a and a host bpftool, generates vmlinux.h from the kernel's BTF, compiles *.bpf.c into BPF objects and skeletons, and exports the include paths, a bpf_link helper, and BPF_LDLIBS. Use can control the behavior by several knobs (source layout/suffix, extra headers/cflags, skeleton suffix, subskeletons, output dirs) that can be used commonly in general cases. Patch 2 adds a new selftest, test_memcg_stat_cross_cpu, under selftests/cgroup. This test is a memory-cgroup statistics correctness test that compares the memcg BPF kfuncs against memory.stat over a whole cgroup subtree charged across many CPUs, and checks the cross-CPU rstat flush. It is the first in-tree consumer of lib.bpf.mk outside selftests/bpf. Patches 3 and 4 convert the duplicated parts in Makefile for two existing duplicating bpf consumers, the selftests/hid and selftests/sched_ext, to lib.bpf.mk. The generated skeletons keep a byte-identical public API and land in the same locations as before. The folders build cleanly under both plain make and LLVM=1. Changes since v1: - Generalized lib.bpf.mk (source layout/suffix, extra hdrs/cflags, skeleton suffix, subskeletons, configurable output dirs) so it can serve hid and sched_ext, not just cgroup. - Added patch 3 (hid) and patch 4 (sched_ext), converting those folders to the shared fragment. Ziyang Men (4): selftests: add shared lib.bpf.mk to build BPF progs and skeletons selftests/cgroup: add memcg_stat_cross_cpu correctness test for flush selftests/hid: build the BPF program via the shared lib.bpf.mk selftests/sched_ext: build BPF schedulers via the shared lib.bpf.mk tools/testing/selftests/cgroup/.gitignore | 6 + tools/testing/selftests/cgroup/Makefile | 21 + tools/testing/selftests/cgroup/config | 4 + .../selftests/cgroup/lib/cgroup_util.c | 48 ++ .../cgroup/lib/include/cgroup_util.h | 1 + .../cgroup/memcg_stat_cross_cpu.bpf.c | 86 ++ .../selftests/cgroup/memcg_stat_cross_cpu.h | 27 + .../cgroup/test_memcg_stat_cross_cpu.c | 780 ++++++++++++++++++ tools/testing/selftests/hid/Makefile | 182 +--- tools/testing/selftests/lib.bpf.mk | 247 ++++++ tools/testing/selftests/sched_ext/Makefile | 153 +--- 11 files changed, 1275 insertions(+), 280 deletions(-) create mode 100644 tools/testing/selftests/cgroup/memcg_stat_cross_cpu.bpf.c create mode 100644 tools/testing/selftests/cgroup/memcg_stat_cross_cpu.h create mode 100644 tools/testing/selftests/cgroup/test_memcg_stat_cross_cpu.c create mode 100644 tools/testing/selftests/lib.bpf.mk base-commit: 6eb8711ece2ce27e52e327a5b7a628ed39b97f45 -- 2.53.0-Meta