netdev - Re: [PATCH bpf-next] bpf: Make symbol 'bpf_task_storage

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Date:   Fri, 12 Mar 2021 01:27:10 +0000
From:   Song Liu <songliubraving@...com>
To:     'Wei Yongjun <weiyongjun1@...wei.com>
CC:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        "Christian Brauner" <christian@...uner.io>,
        Networking <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "Hulk Robot" <hulkci@...wei.com>
Subject: Re: [PATCH bpf-next] bpf: Make symbol 'bpf_task_storage_busy' static



> On Mar 11, 2021, at 5:15 AM, 'Wei Yongjun <weiyongjun1@...wei.com> wrote:
> 
> From: Wei Yongjun <weiyongjun1@...wei.com>
> 
> The sparse tool complains as follows:
> 
> kernel/bpf/bpf_task_storage.c:23:1: warning:
> symbol '__pcpu_scope_bpf_task_storage_busy' was not declared. Should it be static?
> 
> This symbol is not used outside of bpf_task_storage.c, so this
> commit marks it static.
> 
> Fixes: bc235cdb423a ("bpf: Prevent deadlock from recursive bpf_task_storage_[get|delete]")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>

Acked-by: Song Liu <songliubraving@...com>

Thanks for the fix!

> ---
> kernel/bpf/bpf_task_storage.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/bpf/bpf_task_storage.c b/kernel/bpf/bpf_task_storage.c
> index fd3c74ef608e..3ce75758d394 100644
> --- a/kernel/bpf/bpf_task_storage.c
> +++ b/kernel/bpf/bpf_task_storage.c
> @@ -20,7 +20,7 @@
> 
> DEFINE_BPF_STORAGE_CACHE(task_cache);
> 
> -DEFINE_PER_CPU(int, bpf_task_storage_busy);
> +static DEFINE_PER_CPU(int, bpf_task_storage_busy);
> 
> static void bpf_task_storage_lock(void)
> {
>