linux-kernel - Re: [PATCH][next] raw: remove redundant pointers saddr and daddr

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Date:   Wed, 22 Jun 2022 13:52:58 +0200
From:   Eric Dumazet <edumazet@...gle.com>
To:     Colin Ian King <colin.i.king@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        netdev <netdev@...r.kernel.org>, kernel-janitors@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] raw: remove redundant pointers saddr and daddr

On Wed, Jun 22, 2022 at 1:49 PM Colin Ian King <colin.i.king@...il.com> wrote:
>
> Pointers saddr and daddr are being assigned and are never used. The
> pointers are redundant and can be removed.
>
> Cleans up clang scan-build warnings:
> net/ipv6/raw.c:348:3: warning: Value stored to 'saddr' is never read
> net/ipv6/raw.c:349:3: warning: Value stored to 'daddr' is never read
>
> Signed-off-by: Colin Ian King <colin.i.king@...il.com>

Thanks, I have posted this already, with proper tags:

https://patchwork.kernel.org/project/netdevbpf/patch/20220622032303.159394-1-edumazet@google.com/

> ---
>  net/ipv6/raw.c | 3 ---
>  1 file changed, 3 deletions(-)
>
> diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
> index 46b560aacc11..722de9dd0ff7 100644
> --- a/net/ipv6/raw.c
> +++ b/net/ipv6/raw.c
> @@ -332,7 +332,6 @@ static void rawv6_err(struct sock *sk, struct sk_buff *skb,
>  void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
>                 u8 type, u8 code, int inner_offset, __be32 info)
>  {
> -       const struct in6_addr *saddr, *daddr;
>         struct net *net = dev_net(skb->dev);
>         struct hlist_nulls_head *hlist;
>         struct hlist_nulls_node *hnode;
> @@ -345,8 +344,6 @@ void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
>         sk_nulls_for_each(sk, hnode, hlist) {
>                 /* Note: ipv6_hdr(skb) != skb->data */
>                 const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
> -               saddr = &ip6h->saddr;
> -               daddr = &ip6h->daddr;
>
>                 if (!raw_v6_match(net, sk, nexthdr, &ip6h->saddr, &ip6h->daddr,
>                                   inet6_iif(skb), inet6_iif(skb)))
> --
> 2.35.3
>