linux-kernel - Re: [PATCH] bpf: btf: include linux/types.h for u32

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Date: Tue, 16 Apr 2024 16:47:38 +0200
From: Daniel Borkmann <daniel@...earbox.net>
To: Jiri Olsa <olsajiri@...il.com>,
 Dmitrii Bundin <dmitrii.bundin.a@...il.com>
Cc: linux-kernel@...r.kernel.org, bpf@...r.kernel.org, haoluo@...gle.com,
 sdf@...gle.com, kpsingh@...nel.org, john.fastabend@...il.com,
 yonghong.song@...ux.dev, song@...nel.org, eddyz87@...il.com,
 andrii@...nel.org, ast@...nel.org, martin.lau@...ux.dev,
 khazhy@...omium.org, vmalik@...hat.com, ndesaulniers@...gle.com,
 ncopa@...inelinux.org, dxu@...uu.xyz
Subject: Re: [PATCH] bpf: btf: include linux/types.h for u32

On 4/16/24 9:28 AM, Jiri Olsa wrote:
> On Tue, Apr 16, 2024 at 08:27:21AM +0300, Dmitrii Bundin wrote:
>> On Mon, Apr 15, 2024 at 3:11 PM Jiri Olsa <olsajiri@...il.com> wrote:
>>> lgtm, did it actualy cause problem anywhere?
>>>
>>> there's also tools/include/linux/btf_ids.h
>>
>> It caused the problems exactly in the file
>> tools/include/linux/btf_ids.h and was reported in
>> https://bugzilla.kernel.org/show_bug.cgi?id=218647
>> The patch including linux/types.h in tools/include/linux/btf_ids.h is
>> already there https://lore.kernel.org/all/20240328110103.28734-1-ncopa@alpinelinux.org/
>> I also faced the same compile-error of the form
>>
>>      error: unknown type name 'u32'
>>                                u32 cnt;
>>                                ^~~
>> when compiling the bpf tool with glibc 2.28.
>>
>> I think it might be reasonable to add the inclusion in
>> include/linux/btf_ids.h as well to prevent build problems like this.
> 
> ok, it's in the bpf/master already
Please add the error description as motivation aka "why" into the commit
description, otherwise it's not really obvious looking at it at a later
point in time why the include was needed.

Thanks,
Daniel