linux-kernel - Re: [PATCH] ARC: kgdb: add 'fallthrough' to prevent a warning

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Date:   Thu, 22 Apr 2021 15:12:31 +0000
From:   Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:     Randy Dunlap <rdunlap@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
Subject: Re: [PATCH] ARC: kgdb: add 'fallthrough' to prevent a warning

On 4/21/21 10:16 PM, Randy Dunlap wrote:
> Use the 'fallthrough' macro to document that this switch case
> does indeed fall through to the next case.
>
> ../arch/arc/kernel/kgdb.c: In function 'kgdb_arch_handle_exception':
> ../arch/arc/kernel/kgdb.c:141:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    141 |   if (kgdb_hex2long(&ptr, &addr))
>        |      ^
> ../arch/arc/kernel/kgdb.c:144:2: note: here
>    144 |  case 'D':
>        |  ^~~~
>
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Cc: Vineet Gupta <vgupta@...opsys.com>
> Cc: linux-snps-arc@...ts.infradead.org

Thx for the fix Randy. Added to for-curr !

-Vineet

> ---
>   arch/arc/kernel/kgdb.c |    1 +
>   1 file changed, 1 insertion(+)
>
> --- linux-next-20210420.orig/arch/arc/kernel/kgdb.c
> +++ linux-next-20210420/arch/arc/kernel/kgdb.c
> @@ -140,6 +140,7 @@ int kgdb_arch_handle_exception(int e_vec
>   		ptr = &remcomInBuffer[1];
>   		if (kgdb_hex2long(&ptr, &addr))
>   			regs->ret = addr;
> +		fallthrough;
>   
>   	case 'D':
>   	case 'k':