linux-kernel - fallthrough question

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Message-ID: <858a2b13-64e1-99bc-e2f7-5b2477bb1126@infradead.org>
Date:   Fri, 18 Feb 2022 13:57:58 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: fallthrough question

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?

thanks.
-- 
~Randy