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

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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: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20220131220528.98088-8-alexei.starovoitov@gmail.com
This commit is contained in:
Alexei Starovoitov 2022-01-31 14:05:28 -08:00 committed by Daniel Borkmann
parent 18ef5dac93
commit e96f2d64c8
1 changed files with 2 additions and 26 deletions
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28
kernel/bpf/preload/Makefile
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@ -1,40 +1,16 @@
# 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