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Fri, 14 Aug 2026 00:51:15 -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: Viktor Malik , Andrea Righi , Changwoo Min , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Andrew Morton , JP Kobryn , Mykola Lysenko , Nathan Chancellor , Ziyang Men , kernel-team@meta.com, linux-kselftest@vger.kernel.org, cgroups@vger.kernel.org, linux-input@vger.kernel.org, sched-ext@lists.linux.dev, linux-mm@kvack.org, bpf@vger.kernel.org, llvm@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v3 3/4] selftests/hid: build the BPF program via the shared lib.bpf.mk Date: Fri, 14 Aug 2026 00:50:53 -0700 Message-ID: <20260814075054.507089-4-ziyang.meme@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260814075054.507089-1-ziyang.meme@gmail.com> References: <20260814075054.507089-1-ziyang.meme@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 89DE010000B X-Rspam-User: X-Stat-Signature: h81dfzc9fezgkhwg8jp8gx8exdqq36jb X-Rspamd-Server: rspam06 X-HE-Tag: 1786693877-178975 X-HE-Meta: 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 jW2fCOGR 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: hid carries its own ~150 lines of libbpf + bpftool + vmlinux.h + BPF-object + skeleton build machinery, copied from selftests/bpf. Replace it with an include of the shared tools/testing/selftests/lib.bpf.mk, so that the previous ~150 lines of BPF build configuration can now be achieved in only ~10 lines. The generated hid.skel.h public API is same before and after, hid_bpf and hidraw are built and linked the same way. Suggested-by: Eduard Zingerman Suggested-by: Mykola Lysenko Assisted-by: Claude:claude-opus-5 Signed-off-by: Ziyang Men --- tools/testing/selftests/hid/.gitignore | 1 + tools/testing/selftests/hid/Makefile | 180 +++---------------------- 2 files changed, 20 insertions(+), 161 deletions(-) diff --git a/tools/testing/selftests/hid/.gitignore b/tools/testing/selftests/hid/.gitignore index 933f483815b2..69943301dc1d 100644 --- a/tools/testing/selftests/hid/.gitignore +++ b/tools/testing/selftests/hid/.gitignore @@ -1,5 +1,6 @@ bpftool *.skel.h +*.bpf.d /host-tools /tools hid_bpf diff --git a/tools/testing/selftests/hid/Makefile b/tools/testing/selftests/hid/Makefile index 2f423de83147..1d7c64ec992c 100644 --- a/tools/testing/selftests/hid/Makefile +++ b/tools/testing/selftests/hid/Makefile @@ -58,172 +58,31 @@ override define CLEAN $(Q)$(RM) -r $(EXTRA_CLEAN) endef +# progs/hid.c is built into a skeleton by ../lib.bpf.mk. hid keeps the legacy +# progs/.c layout, hence BPF_PROG_EXT. BPF_EXTRA_HDRS is deferred: it +# uses $(BPFDIR), which lib.bpf.mk defines. +BPF_SRCS := $(wildcard progs/*.c) +BPF_PROG_EXT := .c +BPF_EXTRA_HDRS = $(wildcard progs/*.h) $(wildcard $(BPFDIR)/hid_bpf_*.h) \ + $(wildcard $(BPFDIR)/*.bpf.h) +# hid.c predates the shared -Wall and has a few unused locals. +BPF_EXTRA_CFLAGS := -Wno-unused-variable + include ../lib.mk +include ../lib.bpf.mk -TOOLSDIR := $(top_srcdir)/tools -LIBDIR := $(TOOLSDIR)/lib -BPFDIR := $(LIBDIR)/bpf -TOOLSINCDIR := $(TOOLSDIR)/include -BPFTOOLDIR := $(TOOLSDIR)/bpf/bpftool -SCRATCH_DIR := $(OUTPUT)/tools -BUILD_DIR := $(SCRATCH_DIR)/build -INCLUDE_DIR := $(SCRATCH_DIR)/include -BPFOBJ := $(BUILD_DIR)/libbpf/libbpf.a -ifneq ($(CROSS_COMPILE),) -HOST_BUILD_DIR := $(BUILD_DIR)/host -HOST_SCRATCH_DIR := $(OUTPUT)/host-tools -HOST_INCLUDE_DIR := $(HOST_SCRATCH_DIR)/include -else -HOST_BUILD_DIR := $(BUILD_DIR) -HOST_SCRATCH_DIR := $(SCRATCH_DIR) -HOST_INCLUDE_DIR := $(INCLUDE_DIR) -endif -HOST_BPFOBJ := $(HOST_BUILD_DIR)/libbpf/libbpf.a -RESOLVE_BTFIDS := $(HOST_BUILD_DIR)/resolve_btfids/resolve_btfids - -VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux) \ - $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \ - ../../../../vmlinux \ - /sys/kernel/btf/vmlinux \ - /boot/vmlinux-$(shell uname -r) -VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS)))) -ifeq ($(VMLINUX_BTF),) -$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)") -endif +# Ship what this directory shipped before the conversion. +TEST_GEN_FILES += $(BPF_OBJS) +TEST_GEN_PROGS_EXTENDED += $(DEFAULT_BPFTOOL) -# Define simple and short `make test_progs`, `make test_sysctl`, etc targets -# to build individual tests. +# Define simple and short `make hid_bpf`, `make hidraw` targets. # NOTE: Semicolon at the end is critical to override lib.mk's default static # rule for binaries. $(notdir $(TEST_GEN_PROGS)): %: $(OUTPUT)/% ; -# sort removes libbpf duplicates when not cross-building -MAKE_DIRS := $(sort $(BUILD_DIR)/libbpf $(HOST_BUILD_DIR)/libbpf \ - $(HOST_BUILD_DIR)/bpftool $(HOST_BUILD_DIR)/resolve_btfids \ - $(INCLUDE_DIR)) -$(MAKE_DIRS): - $(call msg,MKDIR,,$@) - $(Q)mkdir -p $@ - -DEFAULT_BPFTOOL := $(HOST_SCRATCH_DIR)/sbin/bpftool - -TEST_GEN_PROGS_EXTENDED += $(DEFAULT_BPFTOOL) - -$(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED): $(BPFOBJ) - -BPFTOOL ?= $(DEFAULT_BPFTOOL) -$(DEFAULT_BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile) \ - $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/bpftool - $(Q)$(MAKE) $(submake_extras) -C $(BPFTOOLDIR) \ - ARCH= CROSS_COMPILE= CC=$(HOSTCC) LD=$(HOSTLD) \ - EXTRA_CFLAGS='-g -O0' \ - OUTPUT=$(HOST_BUILD_DIR)/bpftool/ \ - LIBBPF_OUTPUT=$(HOST_BUILD_DIR)/libbpf/ \ - LIBBPF_DESTDIR=$(HOST_SCRATCH_DIR)/ \ - prefix= DESTDIR=$(HOST_SCRATCH_DIR)/ install-bin - -$(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile) \ - | $(BUILD_DIR)/libbpf - $(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(BUILD_DIR)/libbpf/ \ - EXTRA_CFLAGS='-g -O0' \ - DESTDIR=$(SCRATCH_DIR) prefix= all install_headers - -ifneq ($(BPFOBJ),$(HOST_BPFOBJ)) -$(HOST_BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile) \ - | $(HOST_BUILD_DIR)/libbpf - $(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) \ - EXTRA_CFLAGS='-g -O0' ARCH= CROSS_COMPILE= \ - OUTPUT=$(HOST_BUILD_DIR)/libbpf/ CC=$(HOSTCC) LD=$(HOSTLD) \ - DESTDIR=$(HOST_SCRATCH_DIR)/ prefix= all install_headers -endif - -$(INCLUDE_DIR)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR) -ifeq ($(VMLINUX_H),) - $(call msg,GEN,,$@) - $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@ -else - $(call msg,CP,,$@) - $(Q)cp "$(VMLINUX_H)" $@ -endif - -$(RESOLVE_BTFIDS): $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/resolve_btfids \ - $(TOOLSDIR)/bpf/resolve_btfids/main.c \ - $(TOOLSDIR)/lib/rbtree.c \ - $(TOOLSDIR)/lib/zalloc.c \ - $(TOOLSDIR)/lib/string.c \ - $(TOOLSDIR)/lib/ctype.c \ - $(TOOLSDIR)/lib/str_error_r.c - $(Q)$(MAKE) $(submake_extras) -C $(TOOLSDIR)/bpf/resolve_btfids \ - CC=$(HOSTCC) LD=$(HOSTLD) AR=$(HOSTAR) \ - LIBBPF_INCLUDE=$(HOST_INCLUDE_DIR) \ - OUTPUT=$(HOST_BUILD_DIR)/resolve_btfids/ BPFOBJ=$(HOST_BPFOBJ) - -# Get Clang's default includes on this system, as opposed to those seen by -# '--target=bpf'. This fixes "missing" files on some architectures/distros, -# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc. -# -# Use '-idirafter': Don't interfere with include mechanics except where the -# build would have failed anyways. -define get_sys_includes -$(shell $(1) -v -E - &1 \ - | sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \ -$(shell $(1) -dM -E - $@ +# Each test binary links against the in-tree static libbpf that lib.bpf.mk +# built (lib.mk has already prefixed TEST_GEN_PROGS with $(OUTPUT)/). +$(TEST_GEN_PROGS): $(BPFOBJ) $(OUTPUT)/%.o: %.c $(BPF_SKELS) hid_common.h $(call msg,CC,,$@) @@ -233,5 +92,4 @@ $(OUTPUT)/%: $(OUTPUT)/%.o $(call msg,BINARY,,$@) $(Q)$(LINK.c) $^ $(LDLIBS) -o $@ -EXTRA_CLEAN := $(SCRATCH_DIR) $(HOST_SCRATCH_DIR) feature bpftool \ - $(addprefix $(OUTPUT)/,*.o *.skel.h no_alu32) +EXTRA_CLEAN += feature bpftool $(addprefix $(OUTPUT)/,*.o no_alu32) -- 2.53.0-Meta