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Date:   Mon, 30 Nov 2020 15:51:37 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Ralf Baechle <ralf@...ux-mips.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-hams@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH 109/141] net: netrom: Fix fall-through warnings for Clang

On Fri, Nov 20, 2020 at 12:38:15PM -0600, Gustavo A. R. Silva wrote:
> In preparation to enable -Wimplicit-fallthrough for Clang, fix multiple
> warnings by explicitly adding multiple break statements instead of
> letting the code fall through to the next case.
> 
> Link: https://github.com/KSPP/linux/issues/115
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> ---
>  net/netrom/nr_route.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/net/netrom/nr_route.c b/net/netrom/nr_route.c
> index 78da5eab252a..de0456073dc0 100644
> --- a/net/netrom/nr_route.c
> +++ b/net/netrom/nr_route.c
> @@ -266,6 +266,7 @@ static int __must_check nr_add_node(ax25_address *nr, const char *mnemonic,
>  		fallthrough;
>  	case 2:
>  		re_sort_routes(nr_node, 0, 1);
> +		break;
>  	case 1:
>  		break;
>  	}
> @@ -359,6 +360,7 @@ static int nr_del_node(ax25_address *callsign, ax25_address *neighbour, struct n
>  					fallthrough;
>  				case 1:
>  					nr_node->routes[1] = nr_node->routes[2];
> +					fallthrough;

Make this one a break like the others.

>  				case 2:
>  					break;
>  				}
> @@ -482,6 +484,7 @@ static int nr_dec_obs(void)
>  					fallthrough;
>  				case 1:
>  					s->routes[1] = s->routes[2];
> +					break;
>  				case 2:
>  					break;
>  				}
> @@ -529,6 +532,7 @@ void nr_rt_device_down(struct net_device *dev)
>  							fallthrough;
>  						case 1:
>  							t->routes[1] = t->routes[2];
> +							break;
>  						case 2:
>  							break;
>  						}

regards,
dan carpenter

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