tools/bpf/runqslower: Rebuild libbpf.a on libbpf source change

Add missing dependency of $(BPFOBJ) to $(LIBBPF_SRC), so that running make
in runqslower/ will rebuild libbpf.a when there is change in libbpf/.

Fixes: 046ac40f64e1 ("tools/bpf: Add runqslower tool to tools/bpf")
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200204215037.2258698-1-songliubraving@fb.com

diff --git a/tools/bpf/runqslower/Makefile b/tools/bpf/runqslower/Makefile
index 87eae5be9bcd7fd6030c8efd0a1f568b5de9a315..39edd68afa8e08be1ea3adf9da188b56b9648e24 100644 (file)
--- a/tools/bpf/runqslower/Makefile
+++ b/tools/bpf/runqslower/Makefile
@@ -75,7 +75,7 @@ $(OUTPUT)/vmlinux.h: $(VMLINUX_BTF_PATH) | $(OUTPUT) $(BPFTOOL)
        fi
        $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF_PATH) format c > $@
 
-$(BPFOBJ): | $(OUTPUT)
+$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(OUTPUT)
        $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC)                         \
                    OUTPUT=$(abspath $(dir $@))/ $(abspath $@)