netdev - Re: [PATCH bpf-next] selftests/bpf: fix dependency ordering for attach

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Date:   Mon, 7 Oct 2019 18:01:10 +0100 (BST)
From:   Alan Maguire <alan.maguire@...cle.com>
To:     Andrii Nakryiko <andriin@...com>
cc:     bpf@...r.kernel.org, netdev@...r.kernel.org, ast@...com,
        daniel@...earbox.net, andrii.nakryiko@...il.com, kernel-team@...com
Subject: Re: [PATCH bpf-next] selftests/bpf: fix dependency ordering for
 attach_probe test

On Sun, 6 Oct 2019, Andrii Nakryiko wrote:

> Current Makefile dependency chain is not strict enough and allows
> test_attach_probe.o to be built before test_progs's
> prog_test/attach_probe.o is built, which leads to assembler compainig
> about missing included binary.
> 
> This patch is a minimal fix to fix this issue by enforcing that
> test_attach_probe.o (BPF object file) is built before
> prog_tests/attach_probe.c is attempted to be compiled.
> 
> Fixes: 928ca75e59d7 ("selftests/bpf: switch tests to new bpf_object__open_{file, mem}() APIs")
> Signed-off-by: Andrii Nakryiko <andriin@...com>

Reviewed-by: Alan Maguire <alan.maguire@...cle.com>

> ---
>  tools/testing/selftests/bpf/Makefile | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> index 294d7472dad7..f899ed20ef4d 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -160,7 +160,8 @@ $(OUTPUT)/test_queue_map.o: test_queue_stack_map.h
>  $(OUTPUT)/test_stack_map.o: test_queue_stack_map.h
>  
>  $(OUTPUT)/flow_dissector_load.o: flow_dissector_load.h
> -$(OUTPUT)/test_progs.o: flow_dissector_load.h $(OUTPUT)/test_attach_probe.o
> +prog_tests/attach_probe.c: $(OUTPUT)/test_attach_probe.o
> +$(OUTPUT)/test_progs.o: flow_dissector_load.h
>  
>  BTF_LLC_PROBE := $(shell $(LLC) -march=bpf -mattr=help 2>&1 | grep dwarfris)
>  BTF_PAHOLE_PROBE := $(shell $(BTF_PAHOLE) --help 2>&1 | grep BTF)
> -- 
> 2.17.1
> 
>