netdev - Re: [PATCH bpf-next] selftests/bpf: fix compilation error in progs/profiler.inc.h

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Message-ID: <20201015042928.hvluj5xbz3qxqq6r@ast-mbp.dhcp.thefacebook.com>
Date:   Wed, 14 Oct 2020 21:29:28 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Song Liu <songliubraving@...com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org, kernel-team@...com,
        ast@...nel.org, daniel@...earbox.net, john.fastabend@...il.com,
        kpsingh@...omium.org
Subject: Re: [PATCH bpf-next] selftests/bpf: fix compilation error in
 progs/profiler.inc.h

On Tue, Oct 13, 2020 at 09:36:38PM -0700, Song Liu wrote:
> Fix the following error when compiling selftests/bpf
> 
> progs/profiler.inc.h:246:5: error: redefinition of 'pids_cgrp_id' as different kind of symbol
> 
> pids_cgrp_id is used in cgroup code, and included in vmlinux.h. Fix the
> error by renaming pids_cgrp_id as pids_cgroup_id.
> 
> Fixes: 03d4d13fab3f ("selftests/bpf: Add profiler test")
> Signed-off-by: Song Liu <songliubraving@...com>
> ---
>  tools/testing/selftests/bpf/progs/profiler.inc.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/testing/selftests/bpf/progs/profiler.inc.h b/tools/testing/selftests/bpf/progs/profiler.inc.h
> index 00578311a4233..b554c1e40b9fb 100644
> --- a/tools/testing/selftests/bpf/progs/profiler.inc.h
> +++ b/tools/testing/selftests/bpf/progs/profiler.inc.h
> @@ -243,7 +243,7 @@ static ino_t get_inode_from_kernfs(struct kernfs_node* node)
>  	}
>  }
>  
> -int pids_cgrp_id = 1;
> +int pids_cgroup_id = 1;

I would prefer to try one of three options that Andrii suggested.

>  static INLINE void* populate_cgroup_info(struct cgroup_data_t* cgroup_data,
>  					 struct task_struct* task,
> @@ -262,7 +262,7 @@ static INLINE void* populate_cgroup_info(struct cgroup_data_t* cgroup_data,
>  				BPF_CORE_READ(task, cgroups, subsys[i]);
>  			if (subsys != NULL) {
>  				int subsys_id = BPF_CORE_READ(subsys, ss, id);
> -				if (subsys_id == pids_cgrp_id) {
> +				if (subsys_id == pids_cgroup_id) {
>  					proc_kernfs = BPF_CORE_READ(subsys, cgroup, kn);
>  					root_kernfs = BPF_CORE_READ(subsys, ss, root, kf_root, kn);
>  					break;
> -- 
> 2.24.1
>