linux-kernel - Re: [PATCH] bpf: bpf_struct_ops: Remove unnecessary ‘0’ values from err

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Message-ID: <a3da80bc-644b-69d7-675c-6af2d29b7f5c@linux.dev>
Date:   Wed, 2 Aug 2023 17:51:35 -0700
From:   Martin KaFai Lau <martin.lau@...ux.dev>
To:     Li kunyu <kunyu@...china.com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, song@...nel.org, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
        haoluo@...gle.com, jolsa@...nel.org
Subject: Re: [PATCH] bpf: bpf_struct_ops: Remove unnecessary ‘0’ values from err

On 8/1/23 6:23 PM, Li kunyu wrote:
> err is assigned first, so it does not need to initialize the assignment.
> 
> Signed-off-by: Li kunyu <kunyu@...china.com>
> ---
>   kernel/bpf/bpf_struct_ops.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/bpf/bpf_struct_ops.c b/kernel/bpf/bpf_struct_ops.c
> index d3f0a4825fa6..5b591fda5d62 100644
> --- a/kernel/bpf/bpf_struct_ops.c
> +++ b/kernel/bpf/bpf_struct_ops.c
> @@ -376,7 +376,7 @@ static long bpf_struct_ops_map_update_elem(struct bpf_map *map, void *key,
>   	const struct btf_type *t = st_ops->type;
>   	struct bpf_tramp_links *tlinks = NULL;
>   	void *udata, *kdata;
> -	int prog_fd, err = 0;
> +	int prog_fd, err;

The "tlinks" init in two lines above is also not needed. While at the same 
function, please take this chance to remove it together.

Please tag the subject with "bpf-next v2" in the next respin.

>   	void *image, *image_end;
>   	u32 i;
>   
> @@ -818,7 +818,7 @@ static int bpf_struct_ops_map_link_update(struct bpf_link *link, struct bpf_map
>   	struct bpf_struct_ops_map *st_map, *old_st_map;
>   	struct bpf_map *old_map;
>   	struct bpf_struct_ops_link *st_link;
> -	int err = 0;
> +	int err;
>   
>   	st_link = container_of(link, struct bpf_struct_ops_link, link);
>   	st_map = container_of(new_map, struct bpf_struct_ops_map, map);