linux-kernel - Re: [PATCHv2 bpf-next] bpf: fix compilation error without CGROUPS

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Message-Id: <169890482505.9002.10852784674164703819.git-patchwork-notify@kernel.org>
Date:   Thu, 02 Nov 2023 06:00:25 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        lkp@...el.com, bpf@...r.kernel.org, kafai@...com,
        songliubraving@...com, yhs@...com, john.fastabend@...il.com,
        kpsingh@...omium.org, sdf@...gle.com, haoluo@...gle.com,
        laoar.shao@...il.com, tj@...nel.org, linux-kernel@...r.kernel.org,
        mptcp@...ts.linux.dev
Subject: Re: [PATCHv2 bpf-next] bpf: fix compilation error without CGROUPS

Hello:

This patch was applied to bpf/bpf.git (master)
by Alexei Starovoitov <ast@...nel.org>:

On Wed,  1 Nov 2023 19:16:01 +0100 you wrote:
> From: Matthieu Baerts <matttbe@...nel.org>
> 
> Our MPTCP CI complained [1] -- and KBuild too -- that it was no longer
> possible to build the kernel without CONFIG_CGROUPS:
> 
>   kernel/bpf/task_iter.c: In function 'bpf_iter_css_task_new':
>   kernel/bpf/task_iter.c:919:14: error: 'CSS_TASK_ITER_PROCS' undeclared (first use in this function)
>     919 |         case CSS_TASK_ITER_PROCS | CSS_TASK_ITER_THREADED:
>         |              ^~~~~~~~~~~~~~~~~~~
>   kernel/bpf/task_iter.c:919:14: note: each undeclared identifier is reported only once for each function it appears in
>   kernel/bpf/task_iter.c:919:36: error: 'CSS_TASK_ITER_THREADED' undeclared (first use in this function)
>     919 |         case CSS_TASK_ITER_PROCS | CSS_TASK_ITER_THREADED:
>         |                                    ^~~~~~~~~~~~~~~~~~~~~~
>   kernel/bpf/task_iter.c:927:60: error: invalid application of 'sizeof' to incomplete type 'struct css_task_iter'
>     927 |         kit->css_it = bpf_mem_alloc(&bpf_global_ma, sizeof(struct css_task_iter));
>         |                                                            ^~~~~~
>   kernel/bpf/task_iter.c:930:9: error: implicit declaration of function 'css_task_iter_start'; did you mean 'task_seq_start'? [-Werror=implicit-function-declaration]
>     930 |         css_task_iter_start(css, flags, kit->css_it);
>         |         ^~~~~~~~~~~~~~~~~~~
>         |         task_seq_start
>   kernel/bpf/task_iter.c: In function 'bpf_iter_css_task_next':
>   kernel/bpf/task_iter.c:940:16: error: implicit declaration of function 'css_task_iter_next'; did you mean 'class_dev_iter_next'? [-Werror=implicit-function-declaration]
>     940 |         return css_task_iter_next(kit->css_it);
>         |                ^~~~~~~~~~~~~~~~~~
>         |                class_dev_iter_next
>   kernel/bpf/task_iter.c:940:16: error: returning 'int' from a function with return type 'struct task_struct *' makes pointer from integer without a cast [-Werror=int-conversion]
>     940 |         return css_task_iter_next(kit->css_it);
>         |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>   kernel/bpf/task_iter.c: In function 'bpf_iter_css_task_destroy':
>   kernel/bpf/task_iter.c:949:9: error: implicit declaration of function 'css_task_iter_end' [-Werror=implicit-function-declaration]
>     949 |         css_task_iter_end(kit->css_it);
>         |         ^~~~~~~~~~~~~~~~~
> 
> [...]

Here is the summary with links:
  - [PATCHv2,bpf-next] bpf: fix compilation error without CGROUPS
    https://git.kernel.org/bpf/bpf/c/05670f81d128

You are awesome, thank you!
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