From: Toke Høiland-Jørgensen <redacted>

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: 3a0d3092a4ed ("selftests/bpf: Build runqslower from selftests")
Acked-by: Andrii Nakryiko <redacted>
Signed-off-by: Toke Høiland-Jørgensen <redacted>
---
 tools/testing/selftests/bpf/Makefile |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 246d09ffb296..8240282aef7f 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile

@@ -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