linux-kernel - Re: fallthrough question

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Message-ID: <60e0b4b5b1f925743d2bfbbaf170bfecfd0c92fc.camel@perches.com>
Date:   Sat, 19 Feb 2022 03:08:57 -0800
From:   Joe Perches <joe@...ches.com>
To:     Randy Dunlap <rdunlap@...radead.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: fallthrough question

On Fri, 2022-02-18 at 13:57 -0800, Randy Dunlap wrote:
> Hi,
> 
> I expected this to produce a fallthrough warning, but it doesn't
> (with gcc 11.1.0):
> 
> from sound/oss/dmasound/dmasound_core.c:#1481, when falling from case 1
> into case 0: (in arch/m68k/ selected builds only)
> 
> 	case 1:
> 		if ((size = ints[2]) < 256) /* check for small buffer specs */
> 			size <<= 10 ;
>                 if (size < MIN_BUFSIZE || size > MAX_BUFSIZE)
>                         printk("dmasound_setup: invalid write buffer size, using default = %d\n", writeBufSize);
>                 else
>                         writeBufSize = size;
> 	case 0:
> 		break;
> 	default:
> 
> Can you tell me what is going on here?

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91432