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bpf: Compile resolve_btfids tool at kernel compilation start 

[upstream commit 33a57ce0a54d498275f432db04850001175dfdfa]

The resolve_btfids tool will be used during the vmlinux linking,
so it's necessary it's ready for it.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Tested-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200711215329.41165-3-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2020-07-11 23:53:22 +02:00 committed by Menglong Dong
parent 56d43cd3f1
commit 951d13afa2
2 changed files with 21 additions and 4 deletions
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22
Makefile
View File

@ -1020,9 +1020,10 @@ export mod_sign_cmd
HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
has_libelf = $(call try-run,\
echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
ifdef CONFIG_STACK_VALIDATION
has_libelf := $(call try-run,\
echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
ifeq ($(has_libelf),1)
objtool_target := tools/objtool FORCE
else
@ -1031,6 +1032,14 @@ ifdef CONFIG_STACK_VALIDATION
endif
endif
ifdef CONFIG_DEBUG_INFO_BTF
ifeq ($(has_libelf),1)
resolve_btfids_target := tools/bpf/resolve_btfids FORCE
else
ERROR_RESOLVE_BTFIDS := 1
endif
endif
PHONY += prepare0
export MODORDER := $(extmod-prefix)modules.order
@ -1135,7 +1144,7 @@ prepare0: archprepare
$(Q)$(MAKE) $(build)=.
# All the preparing..
prepare: prepare0 prepare-objtool
prepare: prepare0 prepare-objtool prepare-resolve_btfids
# Support for using generic headers in asm-generic
asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
@ -1148,7 +1157,7 @@ uapi-asm-generic:
$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
generic=include/uapi/asm-generic
PHONY += prepare-objtool
PHONY += prepare-objtool prepare-resolve_btfids
prepare-objtool: $(objtool_target)
ifeq ($(SKIP_STACK_VALIDATION),1)
ifdef CONFIG_UNWINDER_ORC
@ -1159,6 +1168,11 @@ else
endif
endif
prepare-resolve_btfids: $(resolve_btfids_target)
ifeq ($(ERROR_RESOLVE_BTFIDS),1)
@echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
@false
endif
# Generate some files
# ---------------------------------------------------------------------------

3
tools/Makefile
View File

@ -66,6 +66,9 @@ cpupower: FORCE
cgroup firewire hv guest spi usb virtio vm bpf iio gpio objtool leds wmi pci firmware debugging: FORCE
$(call descend,$@)
bpf/%: FORCE
$(call descend,$@)
liblockdep: FORCE
$(call descend,lib/lockdep)