linux-kernel - Re: [PATCH 01/11] xen: define gnttab_set_map_op/unmap

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Date:	Thu, 6 Jan 2011 09:16:30 +0000
From:	Ian Campbell <Ian.Campbell@...citrix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"Jeremy Fitzhardinge" <Jeremy.Fitzhardinge@...rix.com>
Subject: Re: [PATCH 01/11] xen: define gnttab_set_map_op/unmap_op

On Wed, 2011-01-05 at 20:25 +0000, Konrad Rzeszutek Wilk wrote:
> On Wed, Dec 15, 2010 at 01:40:36PM +0000, stefano.stabellini@...citrix.com wrote:

> > +static inline void
> > +gnttab_set_map_op(struct gnttab_map_grant_ref *map, phys_addr_t addr,
> > +		  uint32_t flags, grant_ref_t ref, domid_t domid)
> > +{
> > +	if (flags & GNTMAP_contains_pte)
> > +		map->host_addr = addr;
> > +	else if (xen_feature(XENFEAT_auto_translated_physmap))
> > +		map->host_addr = __pa(addr);
> > +	else
> > +		map->host_addr = addr;
> 
> Why not just get rid of the "flags & GNTMAP_contains_pte"? If
> that returns false you still end up setting map->host_addr to addr.

That would behave differently if
xen_feature(XENFEAT_auto_translated_physmap) were true.

Ian.


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