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/<name>.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 <[email protected]> Suggested-by: Eduard Zingerman <[email protected]> Suggested-by: Mykola Lysenko <[email protected]> Assisted-by: Claude:claude-opus-4-8 Signed-off-by: Ziyang Men <[email protected]> --- 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/<name>.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 - </dev/null 2>&1 \ - | sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \ -$(shell $(1) -dM -E - </dev/null | grep '__riscv_xlen ' | awk '{printf("-D__riscv_xlen=%d -D__BITS_PER_LONG=%d", $$3, $$3)}') -endef - -# Determine target endianness. -IS_LITTLE_ENDIAN = $(shell $(CC) -dM -E - </dev/null | \ - grep 'define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__') -MENDIAN=$(if $(IS_LITTLE_ENDIAN),-mlittle-endian,-mbig-endian) - -CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG)) -BPF_CFLAGS = -g -Werror -D__TARGET_ARCH_$(SRCARCH) $(MENDIAN) \ - -Wno-microsoft-anon-tag \ - -fms-extensions \ - -I$(INCLUDE_DIR) - -CLANG_CFLAGS = $(CLANG_SYS_INCLUDES) \ - -Wno-compare-distinct-pointer-types - -# Build BPF object using Clang -# $1 - input .c file -# $2 - output .o file -# $3 - CFLAGS -define CLANG_BPF_BUILD_RULE - $(call msg,CLNG-BPF,$(TRUNNER_BINARY),$2) - $(Q)$(CLANG) $3 -O2 --target=bpf -c $1 -mcpu=v3 -o $2 -endef -# Similar to CLANG_BPF_BUILD_RULE, but with disabled alu32 -define CLANG_NOALU32_BPF_BUILD_RULE - $(call msg,CLNG-BPF,$(TRUNNER_BINARY),$2) - $(Q)$(CLANG) $3 -O2 --target=bpf -c $1 -mcpu=v2 -o $2 -endef -# Build BPF object using GCC -define GCC_BPF_BUILD_RULE - $(call msg,GCC-BPF,$(TRUNNER_BINARY),$2) - $(Q)$(BPF_GCC) $3 -O2 -c $1 -o $2 -endef - -BPF_PROGS_DIR := progs -BPF_BUILD_RULE := CLANG_BPF_BUILD_RULE -BPF_SRCS := $(notdir $(wildcard $(BPF_PROGS_DIR)/*.c)) -BPF_OBJS := $(patsubst %.c,$(OUTPUT)/%.bpf.o, $(BPF_SRCS)) -BPF_SKELS := $(patsubst %.c,$(OUTPUT)/%.skel.h, $(BPF_SRCS)) -TEST_GEN_FILES += $(BPF_OBJS) - -$(BPF_PROGS_DIR)-bpfobjs := y -$(BPF_OBJS): $(OUTPUT)/%.bpf.o: \ - $(BPF_PROGS_DIR)/%.c \ - $(wildcard $(BPF_PROGS_DIR)/*.h) \ - $(INCLUDE_DIR)/vmlinux.h \ - $(wildcard $(BPFDIR)/hid_bpf_*.h) \ - $(wildcard $(BPFDIR)/*.bpf.h) \ - | $(OUTPUT) $(BPFOBJ) - $(call $(BPF_BUILD_RULE),$<,$@, $(BPF_CFLAGS)) - -$(BPF_SKELS): %.skel.h: %.bpf.o $(BPFTOOL) | $(OUTPUT) - $(call msg,GEN-SKEL,$(BINARY),$@) - $(Q)$(BPFTOOL) gen object $(<:.o=.linked1.o) $< - $(Q)$(BPFTOOL) gen skeleton $(<:.o=.linked1.o) name $(notdir $(<:.bpf.o=)) > $@ +# 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
