> On Sep 28, 2019, at 10:49 PM, Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx> wrote:
>
>
>
> On 9/28/19 09:48, Stephen Kitt wrote:
>> This switches zero-length arrays in variable-length structs to C99
>> flexible array members. GCC will then ensure that the arrays are
>> always the last element in the struct.
>>
>> Coccinelle:
>> @@
>> identifier S, fld;
>> type T;
>> @@
>>
>> struct S {
>> ...
>> - T fld[0];
>> + T fld[];
>> ...
>> };
>>
>> Signed-off-by: Stephen Kitt <steve@xxxxxxx>
>> ---
>> Documentation/bpf/btf.rst | 2 +-
>> tools/lib/bpf/libbpf.c | 2 +-
>> tools/lib/bpf/libbpf_internal.h | 2 +-
>> 3 files changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/Documentation/bpf/btf.rst b/Documentation/bpf/btf.rst
>> index 4d565d202ce3..24ce50fc1fc1 100644
>> --- a/Documentation/bpf/btf.rst
>> +++ b/Documentation/bpf/btf.rst
>> @@ -670,7 +670,7 @@ func_info for each specific ELF section.::
>> __u32 sec_name_off; /* offset to section name */
>> __u32 num_info;
>> /* Followed by num_info * record_size number of bytes */
>> - __u8 data[0];
>> + __u8 data[];
>> };
>>
>> Here, num_info must be greater than 0.
>> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
>> index e0276520171b..c02ea0e1a588 100644
>> --- a/tools/lib/bpf/libbpf.c
>> +++ b/tools/lib/bpf/libbpf.c
>> @@ -5577,7 +5577,7 @@ static struct perf_buffer *__perf_buffer__new(int map_fd, size_t page_cnt,
>> struct perf_sample_raw {
>> struct perf_event_header header;
>> uint32_t size;
>> - char data[0];
>> + char data[];
>> };
>>
>> struct perf_sample_lost {
>> diff --git a/tools/lib/bpf/libbpf_internal.h b/tools/lib/bpf/libbpf_internal.h
>> index 2e83a34f8c79..26eaa3f594aa 100644
>> --- a/tools/lib/bpf/libbpf_internal.h
>> +++ b/tools/lib/bpf/libbpf_internal.h
>> @@ -86,7 +86,7 @@ struct btf_ext_info_sec {
>> __u32 sec_name_off;
>> __u32 num_info;
>> /* Followed by num_info * record_size number of bytes */
>> - __u8 data[0];
>> + __u8 data[];
>
> I think you should preserve the tab here.
Agreed.
Besides this:
Acked-by: Song Liu <songliubraving@xxxxxx>
