linux-kernel - Re: [PATCH 1/6] gxfb: create DC/VP/FP-specific handlers rather than using readl/writel

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Message-ID: <20080310173544.171183fc@ephemeral>
Date:	Mon, 10 Mar 2008 17:35:44 -0400
From:	Andres Salomon <dilinger@...ued.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	adaplas@...il.com, linux-kernel@...r.kernel.org,
	linux-fbdev-devel@...ts.sourceforge.net, info-linux@...de.amd.com,
	jordan.crouse@....com
Subject: Re: [PATCH 1/6] gxfb: create DC/VP/FP-specific handlers rather than
 using readl/writel

On Mon, 10 Mar 2008 14:24:05 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Sat, 8 Mar 2008 20:48:26 -0500
> Andres Salomon <dilinger@...ued.net> wrote:
> 
> > +#define read_dc(reg)		readl(par->dc_regs + (reg))
> > +#define write_dc(reg, val)	writel((val), par->dc_regs + (reg))
> > +
> > +#define read_vp(reg)		readl(par->vid_regs + (reg))
> > +#define write_vp(reg, val)	writel((uint32_t) (val), \
> > +					par->vid_regs + (reg))
> > +
> > +#define read_fp(reg)		readl(par->vid_regs + (reg))
> > +#define write_fp(reg, val)	writel((uint32_t) (val), \
> > +					par->vid_regs + (reg))
> > +
> 
> Not very nice, sorry.  They're macros, and macros rather suck.  And they
> implicitly rely upon the caller having some variable called "par" in scope.
> 
> It would be much nicer to do
> 
> /*
>  * documentation goes here
>  */
> static inline u32 read_dc(struct geodefb_par *par, int reg)
> {
> 	return readl(par->dc_regs, reg);
> }
> 
> no?

I can change it if you'd like (although.. sigh.)

However, it's a lot of extra passing around of the 'par' without any
good reason.  Normal I prefer inline functions to macros as well, but
I don't see the point here.
 
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