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Tue, 21 Jul 2026 10:48:42 -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 3/4] selftests/hid: build the BPF program via the shared lib.bpf.mk Date: Tue, 21 Jul 2026 10:48:32 -0700 Message-ID: <20260721174833.1232771-4-ziyang.meme@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260721174833.1232771-1-ziyang.meme@gmail.com> References: <20260721174833.1232771-1-ziyang.meme@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: gbc3mjwkr6yhehrribx4i4pmx6bwg5zs X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 44AACA0006 X-HE-Tag: 1784656124-470015 X-HE-Meta: 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 New+Cebq 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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. hid keeps the legacy progs/.c layout, so it sets BPF_PROG_EXT := .c and passes its shared BPF headers through BPF_EXTRA_HDRS. It also gains the fragment's -Wall on the BPF compile, which its old Makefile did not set; hid.c has a few pre-existing unused locals, so BPF_EXTRA_CFLAGS := -Wno-unused-variable keeps the previous behaviour without touching the program source. The conversion drops two pieces of dead machinery hid had copied from selftests/bpf: a resolve_btfids build that was never a prerequisite of any target, and a CLANG_CFLAGS variable that was never passed to any compile. No functional change: the generated hid.skel.h public API is byte-identical before and after, hid_bpf and hidraw are built and linked the same way, and the folder builds cleanly under both plain make and LLVM=1. Suggested-by: Shakeel Butt Suggested-by: Eduard Zingerman Suggested-by: Mykola Lysenko Assisted-by: Claude:claude-opus-4-8 Signed-off-by: Ziyang Men --- tools/testing/selftests/hid/Makefile | 182 +++------------------------ 1 file changed, 20 insertions(+), 162 deletions(-) diff --git a/tools/testing/selftests/hid/Makefile b/tools/testing/selftests/hid/Makefile index 2f423de83147..48def484703c 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 -include ../lib.mk +# The BPF program (progs/hid.c) is compiled into a skeleton by the shared +# tools/testing/selftests/lib.bpf.mk fragment. hid keeps the legacy +# progs/.c layout, so point BPF_PROG_EXT at .c and hand the fragment +# hid's shared BPF headers as extra prerequisites. BPF_EXTRA_HDRS is deferred +# because it references $(BPFDIR), which lib.bpf.mk defines. +BPF_SRCS := progs/hid.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 (hid's old Makefile didn't set it) and has a +# few unused locals; tolerate that pre-existing warning without touching the +# program source. +BPF_EXTRA_CFLAGS := -Wno-unused-variable -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 +include ../lib.mk +include ../lib.bpf.mk -# 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