Re: [PATCH v4 bpf-next 5/5] tools/bpftool: add support for in-kernel and named BTF in `btf show`

[Song Liu <songliubraving@fb.com>]

> On Nov 10, 2020, at 8:19 PM, Andrii Nakryiko <andrii.nakryiko@gmail.com> wrote:
> 
> On Tue, Nov 10, 2020 at 5:15 PM Song Liu <songliubraving@fb.com> wrote:
>> 
>> 
>> 
>>> On Nov 9, 2020, at 5:19 PM, Andrii Nakryiko <andrii@kernel.org> wrote:
>> 
>> [...]
>> 
>>> ...
>>> 
>>> Tested-by: Alan Maguire <alan.maguire@oracle.com>
>>> Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
>> 
>> Acked-by: Song Liu <songliubraving@fb.com>
>> 
>> With one nit:
>> 
>>> ---
>>> tools/bpf/bpftool/btf.c | 28 +++++++++++++++++++++++++++-
>>> 1 file changed, 27 insertions(+), 1 deletion(-)
>>> 
>>> diff --git a/tools/bpf/bpftool/btf.c b/tools/bpf/bpftool/btf.c
>>> index c96b56e8e3a4..ed5e97157241 100644
>>> --- a/tools/bpf/bpftool/btf.c
>>> +++ b/tools/bpf/bpftool/btf.c
>>> @@ -742,9 +742,14 @@ show_btf_plain(struct bpf_btf_info *info, int fd,
>>>             struct btf_attach_table *btf_map_table)
>>> {
>>>      struct btf_attach_point *obj;
>>> +     const char *name = u64_to_ptr(info->name);
>>>      int n;
>>> 
>>>      printf("%u: ", info->id);
>>> +     if (info->kernel_btf)
>>> +             printf("name [%s]  ", name);
>>> +     else if (name && name[0])
>>> +             printf("name %s  ", name);
>> 
>> Maybe explicitly say "name <anonymous>" for btf without a name? I think
>> it will benefit plain output.
> 
> This patch set is already landed. But I can do a follow-up patch to add this.

I realized this was applied soon after sending this. Yeah, a follow-up 
patch would be great. 

Thanks,
Song