> On Nov 2, 2020, at 10:05 PM, Andrii Nakryiko <andrii.nakryiko@xxxxxxxxx> wrote:
>
> On Mon, Nov 2, 2020 at 9:35 PM Song Liu <songliubraving@xxxxxx> wrote:
>>
>>
>>
>>> On Oct 28, 2020, at 5:59 PM, Andrii Nakryiko <andrii@xxxxxxxxxx> wrote:
>>>
>>> Add selftests validating BTF deduplication for split BTF case. Add a helper
>>> macro that allows to validate entire BTF with raw BTF dump, not just
>>> type-by-type. This saves tons of code and complexity.
>>>
>>> Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
>>
>> Acked-by: Song Liu <songliubraving@xxxxxx>
>>
>> with a couple nits:
>>
>> [...]
>>
>>>
>>> int fprintf_btf_type_raw(FILE *out, const struct btf *btf, __u32 id);
>>> const char *btf_type_raw_dump(const struct btf *btf, int type_id);
>>> +int btf_validate_raw(struct btf *btf, int nr_types, const char *exp_types[]);
>>>
>>> +#define VALIDATE_RAW_BTF(btf, raw_types...) \
>>> + btf_validate_raw(btf, \
>>> + sizeof((const char *[]){raw_types})/sizeof(void *),\
>>> + (const char *[]){raw_types})
>>> +
>>> +const char *btf_type_c_dump(const struct btf *btf);
>>> #endif
>>> diff --git a/tools/testing/selftests/bpf/prog_tests/btf_dedup_split.c b/tools/testing/selftests/bpf/prog_tests/btf_dedup_split.c
>>> new file mode 100644
>>> index 000000000000..097370a41b60
>>> --- /dev/null
>>> +++ b/tools/testing/selftests/bpf/prog_tests/btf_dedup_split.c
>>> @@ -0,0 +1,326 @@
>>> +// SPDX-License-Identifier: GPL-2.0
>>> +/* Copyright (c) 2020 Facebook */
>>> +#include <test_progs.h>
>>> +#include <bpf/btf.h>
>>> +#include "btf_helpers.h"
>>> +
>>> +
>>> +static void test_split_simple() {
>>> + const struct btf_type *t;
>>> + struct btf *btf1, *btf2 = NULL;
>>> + int str_off, err;
>>> +
>>> + btf1 = btf__new_empty();
>>> + if (!ASSERT_OK_PTR(btf1, "empty_main_btf"))
>>> + return;
>>> +
>>> + btf__set_pointer_size(btf1, 8); /* enforce 64-bit arch */
>>> +
>>> + btf__add_int(btf1, "int", 4, BTF_INT_SIGNED); /* [1] int */
>>> + btf__add_ptr(btf1, 1); /* [2] ptr to int */
>>> + btf__add_struct(btf1, "s1", 4); /* [3] struct s1 { */
>>> + btf__add_field(btf1, "f1", 1, 0, 0); /* int f1; */
>>> + /* } */
>>> +
>>
>> nit: two empty lines.
>
> There is a comment on one of them, so I figured it's not an empty line?
Exactly! I missed that one.
[...]
