Commit e96f2d64 authored by Alexei Starovoitov's avatar Alexei Starovoitov Committed by Daniel Borkmann
Browse files

bpf: Drop libbpf, libelf, libz dependency from bpf preload. 



Drop libbpf, libelf, libz dependency from bpf preload.
This reduces bpf_preload_umd binary size
from 1.7M to 30k unstripped with debug info
and from 300k to 19k stripped.

Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarMartin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20220131220528.98088-8-alexei.starovoitov@gmail.com
parent 18ef5dac

kernel/bpf/preload/Makefile

+2 −26
Original line number Diff line number Diff line 
# SPDX-License-Identifier: GPL-2.0



LIBBPF_SRCS = $(srctree)/tools/lib/bpf/

LIBBPF_OUT = $(abspath $(obj))/libbpf

LIBBPF_A = $(LIBBPF_OUT)/libbpf.a

LIBBPF_DESTDIR = $(LIBBPF_OUT)

LIBBPF_INCLUDE = $(LIBBPF_DESTDIR)/include



# Although not in use by libbpf's Makefile, set $(O) so that the "dummy" test

# in tools/scripts/Makefile.include always succeeds when building the kernel

# with $(O) pointing to a relative path, as in "make O=build bindeb-pkg".

$(LIBBPF_A): | $(LIBBPF_OUT)

	$(Q)$(MAKE) -C $(LIBBPF_SRCS) O=$(LIBBPF_OUT)/ OUTPUT=$(LIBBPF_OUT)/   \

		DESTDIR=$(LIBBPF_DESTDIR) prefix=			       \

		$(LIBBPF_OUT)/libbpf.a install_headers



libbpf_hdrs: $(LIBBPF_A)



.PHONY: libbpf_hdrs



$(LIBBPF_OUT):

	$(call msg,MKDIR,$@)

	$(Q)mkdir -p $@

LIBBPF_INCLUDE = $(LIBBPF_SRCS)/..



userccflags += -I $(srctree)/tools/include/ -I $(srctree)/tools/include/uapi \

	-I $(LIBBPF_INCLUDE) -Wno-unused-result



userprogs := bpf_preload_umd



clean-files := libbpf/



$(obj)/iterators/iterators.o: | libbpf_hdrs



bpf_preload_umd-objs := iterators/iterators.o

bpf_preload_umd-userldlibs := $(LIBBPF_A) -lelf -lz



$(obj)/bpf_preload_umd: $(LIBBPF_A)

$(obj)/bpf_preload_umd:



$(obj)/bpf_preload_umd_blob.o: $(obj)/bpf_preload_umd