linux-kernel - Fwd: stable kernels 6.6.23 and 6.1.83 fails to build: error: unknown type name 'u32'

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Date: Mon, 1 Apr 2024 21:09:55 +0700
From: Bagas Sanjaya <bagasdotme@...il.com>
To: Viktor Malik <vmalik@...hat.com>, Andrii Nakryiko <andrii@...nel.org>,
	Daniel Xu <dxu@...uu.xyz>, Alexei Starovoitov <ast@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>, ncopa@...inelinux.org
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Regressions <regressions@...ts.linux.dev>,
	Linux Stable <stable@...r.kernel.org>
Subject: Fwd: stable kernels 6.6.23 and 6.1.83 fails to build: error: unknown
 type name 'u32'

Hi,

On Bugzilla, ncopa@...inelinux.org reported resolve_btfids FTBFS regression
on musl system [1]:

> The latest releases fails to build with musl libc (Alpine Linux edge and v3.19):
> 
> ```
> rm -f -f /home/ncopa/aports/main/linux-lts/src/build-lts.x86_64/tools/bpf/resolve_btfids/libbpf/libbpf.a; ar rcs /home/ncopa/aports/main/linux-lts/src/build-lts.x86_64/tool
> s/bpf/resolve_btfids/libbpf/libbpf.a /home/ncopa/aports/main/linux-lts/src/build-lts.x86_64/tools/bpf/resolve_btfids/libbpf/staticobjs/libbpf-in.o
> In file included from main.c:73:
> /home/ncopa/aports/main/linux-lts/src/linux-6.6/tools/include/linux/btf_ids.h:7:9: error: unknown type name 'u32'
>     7 |         u32 cnt;                                                              
>       |         ^~~                
> /home/ncopa/aports/main/linux-lts/src/linux-6.6/tools/include/linux/btf_ids.h:8:9: error: unknown type name 'u32'
>     8 |         u32 ids[];         
>       |         ^~~                    
> /home/ncopa/aports/main/linux-lts/src/linux-6.6/tools/include/linux/btf_ids.h:12:9: error: unknown type name 'u32'
>    12 |         u32 cnt;   
>       |         ^~~                        
> /home/ncopa/aports/main/linux-lts/src/linux-6.6/tools/include/linux/btf_ids.h:13:9: error: unknown type name 'u32'
>    13 |         u32 flags;
>       |         ^~~
> /home/ncopa/aports/main/linux-lts/src/linux-6.6/tools/include/linux/btf_ids.h:15:17: error: unknown type name 'u32'
>    15 |                 u32 id;
>       |                 ^~~
> /home/ncopa/aports/main/linux-lts/src/linux-6.6/tools/include/linux/btf_ids.h:16:17: error: unknown type name 'u32'
>    16 |                 u32 flags;
>       |                 ^~~
> /home/ncopa/aports/main/linux-lts/src/linux-6.6/tools/include/linux/btf_ids.h:215:8: error: unknown type name 'u32'
>   215 | extern u32 btf_tracing_ids[];
>       |        ^~~
> make[4]: *** [/home/ncopa/aports/main/linux-lts/src/linux-6.6/tools/build/Makefile.build:98: /home/ncopa/aports/main/linux-lts/src/build-lts.x86_64/tools/bpf/resolve_btfids
> /main.o] Error 1
> make[4]: *** Waiting for unfinished jobs....
> make[3]: *** [Makefile:83: /home/ncopa/aports/main/linux-lts/src/build-lts.x86_64/tools/bpf/resolve_btfids//resolve_btfids-in.o] Error 2
> make[2]: *** [Makefile:76: bpf/resolve_btfids] Error 2
> make[1]: *** [/home/ncopa/aports/main/linux-lts/src/linux-6.6/Makefile:1354: tools/bpf/resolve_btfids] Error 2
> make: *** [/home/ncopa/aports/main/linux-lts/src/linux-6.6/Makefile:234: __sub-make] Error 2
> ```

Bisection led to upstream commit 9707ac4fe2f5ba ("tools/resolve_btfids:
Refactor set sorting with types from btf_ids.h") as the culprit.

See the report on Bugzilla for the full thread and proposed fix.

Thanks.

[1]: https://bugzilla.kernel.org/show_bug.cgi?id=218647

-- 
An old man doll... just what I always wanted! - Clara

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