Re: [PATCH bpf-next v5 25/25] selftests/bpf: Add BTF sanity tests

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On Mon, Nov 7, 2022 at 3:11 PM Kumar Kartikeya Dwivedi <memxor@xxxxxxxxx> wrote:
>
> Preparing the metadata for bpf_list_head involves a complicated parsing
> step and type resolution for the contained value. Ensure that corner
> cases are tested against and invalid specifications in source are duly
> rejected. Also include tests for incorrect ownership relationships in
> the BTF.
>
> Signed-off-by: Kumar Kartikeya Dwivedi <memxor@xxxxxxxxx>
> ---
>  .../selftests/bpf/prog_tests/linked_list.c    | 271 ++++++++++++++++++
>  1 file changed, 271 insertions(+)
>

Have you considered using BTW write API to construct BTFs?
btf__new_empty() + btf__add_xxx()?

> diff --git a/tools/testing/selftests/bpf/prog_tests/linked_list.c b/tools/testing/selftests/bpf/prog_tests/linked_list.c
> index 669ef4bb9b87..40070e2d22f2 100644
> --- a/tools/testing/selftests/bpf/prog_tests/linked_list.c
> +++ b/tools/testing/selftests/bpf/prog_tests/linked_list.c
> @@ -1,4 +1,7 @@
>  // SPDX-License-Identifier: GPL-2.0
> +#include <bpf/btf.h>
> +#include <test_btf.h>
> +#include <linux/btf.h>
>  #include <test_progs.h>
>  #include <network_helpers.h>
>

[...]



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