linux-kernel - Re: [PATCH 4/3] g_NCR5380: Merge g_NCR5380 and g_NCR5380

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Date:   Sun, 25 Sep 2016 16:55:42 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Ondrej Zary <linux@...nbow-software.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Finn Thain <fthain@...egraphics.com.au>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/3] g_NCR5380: Merge g_NCR5380 and g_NCR5380_mmio

On Sun, Sep 25, 2016 at 09:39:20PM +0200, Ondrej Zary wrote:
> Merge the PIO and MMIO code (with the help of ioport_map) in g_NCR5380 and
> delete g_NCR5380_mmio.

Awesome!  this looks great to me, but we probably should thrown
in a MODULE_ALIAS for g_NCR5380_mmio so that existing module
configurations keep working.

>  #define NCR5380_read(reg) \
> +	ioread8(((struct NCR5380_hostdata *)shost_priv(instance))->iomem + \
> +		((struct NCR5380_hostdata *)shost_priv(instance))->offset + \
> +		(reg))
>  #define NCR5380_write(reg, value) \
> -	outb(value, instance->io_port + (reg))
> +	iowrite8(value, ((struct NCR5380_hostdata *)shost_priv(instance))->iomem + \
> +		((struct NCR5380_hostdata *)shost_priv(instance))->offset + \
> +		(reg))

Can we make these #defines point to inline helper functions that avoid
the casting magic, e.g. something like

static inline void g_NCR5380_write(struct Scsi_Host *instance, u32 reg,
		u8 value)
{
	struct NCR5380_hostdata *host = shost_priv(instance);

	iowrite8(value, host->iomem, host->offset + reg);
}

#define NCR5380_write(reg, value)
	g_NCR5380_write(instance, reg, value)