On Fri, Sep 30, 2022 at 9:50 AM Eduard Zingerman <eddyz87@xxxxxxxxx> wrote:
>
> Verify that `bpftool btf dump file ... format c` correctly prints
> newlines for structures that consist of anonymous-only padding fields.
>
> Signed-off-by: Eduard Zingerman <eddyz87@xxxxxxxxx>
> ---
> .../bpf/progs/btf_dump_test_case_padding.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
> diff --git a/tools/testing/selftests/bpf/progs/btf_dump_test_case_padding.c b/tools/testing/selftests/bpf/progs/btf_dump_test_case_padding.c
> index f2661c8d2d90..08e43ee38188 100644
> --- a/tools/testing/selftests/bpf/progs/btf_dump_test_case_padding.c
> +++ b/tools/testing/selftests/bpf/progs/btf_dump_test_case_padding.c
> @@ -102,12 +102,28 @@ struct zone {
> struct zone_padding __pad__;
> };
>
> +/* ----- START-EXPECTED-OUTPUT ----- */
> +/*
> + *struct padding_wo_named_members {
> + * long: 64;
> + * long: 64;
> + *};
> + *
> + */
> +/* ------ END-EXPECTED-OUTPUT ------ */
> +
> +struct padding_wo_named_members {
> + long: 64;
> + long: 64;
> +} __attribute__((aligned(8)));
you don't really need aligned(8) attribute, if you drop it you can
have a single copy of the struct (just like padded_implicitly above)
> +
> int f(struct {
> struct padded_implicitly _1;
> struct padded_explicitly _2;
> struct padded_a_lot _3;
> struct padded_cache_line _4;
> struct zone _5;
> + struct padding_wo_named_members _6;
> } *_)
> {
> return 0;
> --
> 2.37.3
>
