linux-kernel - Re: [PATCH bpf-next v2] selftests/bpf: fix some bugs in map_lookup_percpu

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Message-ID: <CAEf4BzaE_WJBQ6xxMy8VmJy3OsPyCCjyRKi_F-CdPLwVVp+7Ng@mail.gmail.com>
Date:   Fri, 20 May 2022 15:00:45 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Yonghong Song <yhs@...com>
Cc:     Feng zhou <zhoufeng.zf@...edance.com>,
        Shuah Khan <shuah@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>, Martin Lau <kafai@...com>,
        Song Liu <songliubraving@...com>,
        john fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...nel.org>,
        Dave Marchevsky <davemarchevsky@...com>,
        Joanne Koong <joannekoong@...com>,
        Geliang Tang <geliang.tang@...e.com>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        duanxiongchun@...edance.com,
        Muchun Song <songmuchun@...edance.com>,
        Dongdong Wang <wangdongdong.6@...edance.com>,
        Cong Wang <cong.wang@...edance.com>,
        zhouchengming@...edance.com, Yosry Ahmed <yosryahmed@...gle.com>
Subject: Re: [PATCH bpf-next v2] selftests/bpf: fix some bugs in
 map_lookup_percpu_elem testcase

On Wed, May 18, 2022 at 8:44 AM Yonghong Song <yhs@...com> wrote:
>
>
>
> On 5/17/22 7:50 PM, Feng zhou wrote:
> > From: Feng Zhou <zhoufeng.zf@...edance.com>
> >
> > comments from Andrii Nakryiko, details in here:
> > https://lore.kernel.org/lkml/20220511093854.411-1-zhoufeng.zf@bytedance.com/T/
> >
> > use /* */ instead of //
> > use libbpf_num_possible_cpus() instead of sysconf(_SC_NPROCESSORS_ONLN)
> > use 8 bytes for value size
> > fix memory leak
> > use ASSERT_EQ instead of ASSERT_OK
> > add bpf_loop to fetch values on each possible CPU
> >
> > Fixes: ed7c13776e20c74486b0939a3c1de984c5efb6aa ("selftests/bpf: add test case for bpf_map_lookup_percpu_elem")
> > Signed-off-by: Feng Zhou <zhoufeng.zf@...edance.com>
>
> Acked-by: Yonghong Song <yhs@...com>


I've fixed remaining formatting issues and added my_pid check to avoid
accidental interference with other tests/processes. Applied to
bpf-next, thanks.