forked from luck/tmp_suning_uos_patched
selftests/bpf: Support out-of-tree vmlinux builds for VMLINUX_BTF
Add detection of out-of-tree built vmlinux image for the purpose of VMLINUX_BTF detection. According to Documentation/kbuild/kbuild.rst, O takes precedence over KBUILD_OUTPUT. Also ensure ~/path/to/build/dir also works by relying on wildcard's resolution first, but then applying $(abspath) at the end to also handle O=../../whatever cases. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200304184336.165766-1-andriin@fb.com
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@ -129,10 +129,13 @@ $(OUTPUT)/test_stub.o: test_stub.c $(BPFOBJ)
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$(call msg,CC,,$@)
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$(CC) -c $(CFLAGS) -o $@ $<
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VMLINUX_BTF_PATHS := $(abspath ../../../../vmlinux) \
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/sys/kernel/btf/vmlinux \
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/boot/vmlinux-$(shell uname -r)
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VMLINUX_BTF:= $(firstword $(wildcard $(VMLINUX_BTF_PATHS)))
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VMLINUX_BTF_PATHS := $(if $(O),$(O)/vmlinux) \
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$(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \
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../../../../vmlinux \
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/sys/kernel/btf/vmlinux \
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/boot/vmlinux-$(shell uname -r)
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VMLINUX_BTF:= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
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$(OUTPUT)/runqslower: $(BPFOBJ)
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$(Q)$(MAKE) $(submake_extras) -C $(TOOLSDIR)/bpf/runqslower \
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OUTPUT=$(SCRATCH_DIR)/ VMLINUX_BTF=$(VMLINUX_BTF) \
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