linux-kernel - Re: [PATCH 2/2] irqdomain: Support one-shot tear down of domain mappings.

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Date:	Sun, 17 Jun 2012 17:48:33 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] irqdomain: Support one-shot tear down of domain mappings.

On Sat, 16 Jun 2012 07:34:03 +0900, Paul Mundt <lethal@...ux-sh.org> wrote:
> On Fri, Jun 15, 2012 at 12:35:18PM -0600, Grant Likely wrote:
> > On Wed, 13 Jun 2012 16:34:01 +0900, Paul Mundt <lethal@...ux-sh.org> wrote:
> > > +/**
> > > + * irq_domain_dispose_mappings() - Dispose of all mappings in a domain
> > > + * @domain: domain to tear down
> > > + */
> > > +void irq_domain_dispose_mappings(struct irq_domain *domain)
> > > +{
> > > +	if (domain->revmap_type == IRQ_DOMAIN_MAP_NOMAP)
> > > +		return;
> > > +
> > > +	if (domain->linear_size) {
> > > +		int i;
> > > +
> > > +		for (i = 0; i < domain->linear_size; i++)
> > > +			irq_dispose_mapping(domain->linear_revmap[i]);
> > > +	} else {
> > 
> > The 'else' should be dropped I think.  With the merge of linear and
> > tree mappings into the same domain type, it is possible for a domain
> > to have both linear and tree mappings in the same instance.  So tree
> > needs to be cleared even if linear_size is non-zero.
> > 
> Ok, that's fine. Though by that same logic wouldn't it also be possible
> for a domain to have multiple linear ranges?

except that there is only one linear map.  It would be possible to
have multiple maps, but I'm going to resist adding a whole lot of
options for reverse mapping to keep the lookup overhead low.  A
sufficiently large linear map would also handle multiple linear maps.

g.

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