linux-kernel - Re: [PATCH v2 5/6] esp_scsi: De-duplicate PIO routines

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Message-ID: <20181015125329.GA8952@infradead.org>
Date:   Mon, 15 Oct 2018 05:53:29 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Hannes Reinecke <hare@...e.de>
Cc:     Finn Thain <fthain@...egraphics.com.au>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Michael Schmitz <schmitzmic@...il.com>,
        linux-scsi@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/6] esp_scsi: De-duplicate PIO routines

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.