linux-kernel - Re: [PATCH v2] regmap: Cut down on the average # of nodes in the rbtree cache

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Message-ID: <20130315111454.GA30777@opensource.wolfsonmicro.com>
Date:	Fri, 15 Mar 2013 11:14:54 +0000
From:	Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] regmap: Cut down on the average # of nodes in the
	rbtree cache

On Fri, Mar 15, 2013 at 01:35:34AM +0000, Mark Brown wrote:
> On Thu, Mar 14, 2013 at 02:52:35PM +0000, Dimitris Papastamos wrote:
> 
> >  	if (rbnode) {
> >  		reg_tmp = (reg - rbnode->base_reg) / map->reg_stride;
> > +		/* Does this register exist?  If not bail out. */
> > +		if (!(rbtree_ctx->reg_present[BIT_WORD(reg)] & BIT_MASK(reg)))
> > +			return -ENOENT;
> >  		*value = regcache_rbtree_get_register(map, rbnode, reg_tmp);
> 
> This means that every caller is going to need to have a check added to
> see if the register is present which doesn't seem great, we should at
> least have a function to do the check.  The check is fiddly enough.

Yea makes sense, will factor it out.

Thanks,
Dimitris
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