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

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Date:   Mon, 26 Sep 2016 10:37:13 +1000 (AEST)
From:   Finn Thain <fthain@...egraphics.com.au>
To:     Christoph Hellwig <hch@...radead.org>
cc:     Ondrej Zary <linux@...nbow-software.org>,
        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, 25 Sep 2016, Christoph Hellwig wrote:

> On Sun, Sep 25, 2016 at 09:39:20PM +0200, Ondrej Zary wrote:
> 
> >  #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)

Let's not do that yet. I have a patch series that fixes the type casting 
and related issues that I will post soon. I expect that Ondrej's patches 
will be ready before mine are, so I'll rebase mine on this work before I 
ask him to test my patches.

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