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

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Date:   Fri, 8 Mar 2019 05:44:56 +0000
From:   Yonghong Song <yhs@...com>
To:     Bo YU <tsu.yubo@...il.com>, "ast@...nel.org" <ast@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        Martin Lau <kafai@...com>,
        "ongliubraving@...com" <ongliubraving@...com>,
        "davem@...emloft.net" <davem@...emloft.net>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "yuzibode@....com" <yuzibode@....com>
Subject: Re: [PATCH] bpf: fix warning about using plain integer as NULL



On 3/7/19 8:39 PM, Bo YU 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
> 
> Signed-off-by: Bo YU <tsu.yubo@...il.com>

Could you add proper fixes like below:
Fixes: 8bad74f9840f ("bpf: extend cgroup bpf core to allow multiple 
cgroup storage types")

With that,
Acked-by: Yonghong Song <yhs@...com>

> ---
>   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;
>