linux-kernel - Re: [PATCH net-next v3 4/5] ip_tunnel: constify input argument of ip_tunnel_info

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Date:   Sun, 19 Feb 2023 21:29:02 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     Gavin Li <gavinl@...dia.com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, roopa@...dia.com,
        eng.alaamohamedsoliman.am@...il.com, bigeasy@...utronix.de,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        gavi@...dia.com, roid@...dia.com, maord@...dia.com,
        saeedm@...dia.com
Subject: Re: [PATCH net-next v3 4/5] ip_tunnel: constify input argument of
 ip_tunnel_info_opts( )

On Fri, Feb 17, 2023 at 05:39:24AM +0200, Gavin Li wrote:
> Constify input argument(i.e. struct ip_tunnel_info *info) of
> ip_tunnel_info_opts( ) so that it wouldn't be needed to W/A it each time
> in each driver.
> 
> Signed-off-by: Gavin Li <gavinl@...dia.com>
> ---
>  include/net/ip_tunnels.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
> index fca357679816..32c77f149c6e 100644
> --- a/include/net/ip_tunnels.h
> +++ b/include/net/ip_tunnels.h
> @@ -485,9 +485,9 @@ static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len)
>  	}
>  }
>  
> -static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info)
> +static inline void *ip_tunnel_info_opts(const struct ip_tunnel_info *info)
>  {
> -	return info + 1;
> +	return (void *)(info + 1);

I'm unclear on what problem this is trying to solve,
but info being const, and then returning (info +1)
as non-const feels like it is masking rather than fixing a problem.

>  }
>  
>  static inline void ip_tunnel_info_opts_get(void *to,
> -- 
> 2.31.1
>