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

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Date:   Tue, 31 Oct 2023 20:54:56 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Jiri Olsa <olsajiri@...il.com>
Cc:     Matthieu Baerts <matttbe@...nel.org>,
        Yonghong Song <yonghong.song@...ux.dev>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>,
        Chuyi Zhou <zhouchuyi@...edance.com>,
        Tejun Heo <tj@...nel.org>, bpf <bpf@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        MPTCP Upstream <mptcp@...ts.linux.dev>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH bpf-next] bpf: fix compilation error without CGROUPS

On Tue, Oct 31, 2023 at 10:05 AM Jiri Olsa <olsajiri@...il.com> wrote:
>
> On Tue, Oct 31, 2023 at 04:49:34PM +0100, Matthieu Baerts wrote:
> > 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);
> >         |         ^~~~~~~~~~~~~~~~~
> >
> > This patch simply surrounds with a #ifdef the new code requiring CGroups
> > support. It seems enough for the compiler and this is similar to
> > bpf_iter_css_{new,next,destroy}() functions where no other #ifdef have
> > been added in kernel/bpf/helpers.c and in the selftests.
> >
> > Fixes: 9c66dc94b62a ("bpf: Introduce css_task open-coded iterator kfuncs")
> > Link: https://github.com/multipath-tcp/mptcp_net-next/actions/runs/6665206927
> > Reported-by: kernel test robot <lkp@...el.com>
> > Closes: https://lore.kernel.org/oe-kbuild-all/202310260528.aHWgVFqq-lkp@intel.com/
> > Signed-off-by: Matthieu Baerts <matttbe@...nel.org>
>
> Acked/Tested-by: Jiri Olsa <jolsa@...nel.org>

I believe this patch has the same issue as Arnd's patch:
https://lore.kernel.org/all/CAADnVQL-zoFPPOVu3nM981gKxRu7Q3G3LTRsKstJEeahpoR1RQ@mail.gmail.com/

I'd like to merge the fix asap. Please make it a complete fix.