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selftests: Pass VMLINUX_BTF to runqslower Makefile 

Add a VMLINUX_BTF variable with the locally-built path when calling the
runqslower Makefile from selftests. This makes sure a simple 'make'
invocation in the selftests dir works even when there is no BTF information
for the running kernel. Do a wildcard expansion and include the same paths
for BTF for the running kernel as in the runqslower Makefile, to make it
possible to build selftests without having a vmlinux in the local tree.

Also fix the make invocation to use $(OUTPUT)/tools as the destination
directory instead of $(CURDIR)/tools.

Fixes: 3a0d3092a4 ("selftests/bpf: Build runqslower from selftests")
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/157952560344.1683545.2723631988771664417.stgit@toke.dk
This commit is contained in:
Toke Høiland-Jørgensen 2020-01-20 14:06:43 +01:00 committed by Alexei Starovoitov
parent a835d38d41
commit bfe42797bc
1 changed files with 6 additions and 2 deletions
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8
tools/testing/selftests/bpf/Makefile
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@ -124,10 +124,14 @@ $(OUTPUT)/test_stub.o: test_stub.c
$(call msg,CC,,$@)
$(CC) -c $(CFLAGS) -o $@ $<
VMLINUX_BTF_PATHS := $(abspath ../../../../vmlinux) \
/sys/kernel/btf/vmlinux \
/boot/vmlinux-$(shell uname -r)
VMLINUX_BTF:= $(firstword $(wildcard $(VMLINUX_BTF_PATHS)))
.PHONY: $(OUTPUT)/runqslower
$(OUTPUT)/runqslower: force
$(Q)$(MAKE) $(submake_extras) -C $(TOOLSDIR)/bpf/runqslower \
OUTPUT=$(CURDIR)/tools/
$(Q)$(MAKE) $(submake_extras) -C $(TOOLSDIR)/bpf/runqslower \
OUTPUT=$(OUTPUT)/tools/ VMLINUX_BTF=$(VMLINUX_BTF)
BPFOBJ := $(OUTPUT)/libbpf.a