From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH v2 5/6] esp_scsi: De-duplicate PIO routines
Date: Mon, 15 Oct 2018 05:53:29 -0700
Message-ID: <20181015125329.GA8952@infradead.org>
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To: Hannes Reinecke <hare@suse.de>
Cc: Finn Thain <fthain@telegraphics.com.au>, "James E.J. Bottomley" <jejb@linux.vnet.ibm.com>, "Martin K. Petersen" <martin.petersen@oracle.com>, Michael Schmitz <schmitzmic@gmail.com>, linux-scsi@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-kernel@vger.kernel.org
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On Mon, Oct 15, 2018 at 12:58:42PM +0200, Hannes Reinecke wrote:
> However, the function declaration really is a worry, as the actual function
> body only exists when the config option is enabled.

Having a prototype without an implementation is no problem at all.
We have this case all over the kernel, either intentionally to keep
things simple or due to bitrot.