linux-kernel - Re: [PATCH V2] bpf: fix warning about using plain integer as NULL

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Message-ID: <CAH3MdRWKvif5Q-bP7nU26g8WTzL5Ox2R43hZbRS+ZRRwzaYyOg@mail.gmail.com>
Date:   Thu, 7 Mar 2019 22:29:51 -0800
From:   Y Song <ys114321@...il.com>
To:     Bo YU <tsu.yubo@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>, ongliubraving@...com,
        Yonghong Song <yhs@...com>, David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>, bpf@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>, yuzibode@....com
Subject: Re: [PATCH V2] bpf: fix warning about using plain integer as NULL

On Thu, Mar 7, 2019 at 10:12 PM Bo YU <tsu.yubo@...il.com> wrote:
>
> Sparse warning below:
>
> sudo make C=2 CF=-D__CHECK_ENDIAN__ M=net/bpf/
> CHECK   net/bpf//test_run.c
> net/bpf//test_run.c:19:77: warning: Using plain integer as NULL pointer
> ./include/linux/bpf-cgroup.h:295:77: warning: Using plain integer as NULL pointer
>
> Fixes: 8bad74f9840f ("bpf: extend cgroup bpf core to allow multiple
> cgroup storage types")
>
> Acked-by: Yonghong Song <yhs@...com>
> Signed-off-by: Bo YU <tsu.yubo@...il.com>

There should be no empty line between tags ("Fixes" and "Acked-by").
"Fixes" tag should be all in one line. My previous reply may be
wrapped by the email client, which is not my intention.

> ---
> V2: Add fix-up tag from Yonghong
> ---
>  include/linux/bpf-cgroup.h | 2 +-
>  net/bpf/test_run.c         | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/bpf-cgroup.h b/include/linux/bpf-cgroup.h
> index 695b2a880d9a..a4c644c1c091 100644
> --- a/include/linux/bpf-cgroup.h
> +++ b/include/linux/bpf-cgroup.h
> @@ -292,7 +292,7 @@ static inline int bpf_cgroup_storage_assign(struct bpf_prog *prog,
>  static inline void bpf_cgroup_storage_release(struct bpf_prog *prog,
>                                               struct bpf_map *map) {}
>  static inline struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(
> -       struct bpf_prog *prog, enum bpf_cgroup_storage_type stype) { return 0; }
> +       struct bpf_prog *prog, enum bpf_cgroup_storage_type stype) { return NULL; }
>  static inline void bpf_cgroup_storage_free(
>         struct bpf_cgroup_storage *storage) {}
>  static inline int bpf_percpu_cgroup_storage_copy(struct bpf_map *map, void *key,
> diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
> index da7051d62727..fab142b796ef 100644
> --- a/net/bpf/test_run.c
> +++ b/net/bpf/test_run.c
> @@ -16,7 +16,7 @@
>  static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat,
>                         u32 *retval, u32 *time)
>  {
> -       struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE] = { 0 };
> +       struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE] = { NULL };
>         enum bpf_cgroup_storage_type stype;
>         u64 time_start, time_spent = 0;
>         int ret = 0;
> --
> 2.11.0
>