linux-kernel - Re: [PATCH] net: ehea: Mark expected switch fall-through

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Date:   Mon, 29 Jul 2019 09:38:52 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Douglas Miller <dougmill@...ux.ibm.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH] net: ehea: Mark expected switch fall-through

On Sun, Jul 28, 2019 at 07:30:09PM -0500, Gustavo A. R. Silva wrote:
> Mark switch cases where we are expecting to fall through.
> 
> This patch fixes the following warning:
> 
> drivers/net/ethernet/ibm/ehea/ehea_main.c: In function 'ehea_mem_notifier':
> include/linux/printk.h:311:2: warning: this statement may fall through [-Wimplicit-fallthrough=]
>   printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
>   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/net/ethernet/ibm/ehea/ehea_main.c:3253:3: note: in expansion of macro 'pr_info'
>    pr_info("memory offlining canceled");
>    ^~~~~~~
> drivers/net/ethernet/ibm/ehea/ehea_main.c:3256:2: note: here
>   case MEM_ONLINE:
>   ^~~~
> 
> Notice that, in this particular case, the code comment is
> modified in accordance with what GCC is expecting to find.
> 
> Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

Reviewed-by: Kees Cook <keescook@...omium.org>

-Kees

> ---
>  drivers/net/ethernet/ibm/ehea/ehea_main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/ibm/ehea/ehea_main.c b/drivers/net/ethernet/ibm/ehea/ehea_main.c
> index 4138a8480347..cca71ba7a74a 100644
> --- a/drivers/net/ethernet/ibm/ehea/ehea_main.c
> +++ b/drivers/net/ethernet/ibm/ehea/ehea_main.c
> @@ -3251,7 +3251,7 @@ static int ehea_mem_notifier(struct notifier_block *nb,
>  	switch (action) {
>  	case MEM_CANCEL_OFFLINE:
>  		pr_info("memory offlining canceled");
> -		/* Fall through: re-add canceled memory block */
> +		/* Fall through - re-add canceled memory block */
>  
>  	case MEM_ONLINE:
>  		pr_info("memory is going online");
> -- 
> 2.22.0
> 

-- 
Kees Cook