linux-kernel - Re: [PATCH v5 05/22] xen/grant: Add helper gnttab_page_grant_foreign_access_ref

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Date:	Wed, 30 Sep 2015 11:50:27 +0100
From:	Julien Grall <julien.grall@...rix.com>
To:	<xen-devel@...ts.xenproject.org>
CC:	<linux-arm-kernel@...ts.infradead.org>, <ian.campbell@...rix.com>,
	<stefano.stabellini@...citrix.com>, <linux-kernel@...r.kernel.org>,
	"Julien Grall" <julien.grall@...aro.org>,
	David Vrabel <david.vrabel@...rix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [PATCH v5 05/22] xen/grant: Add helper gnttab_page_grant_foreign_access_ref_one

On 30/09/15 11:45, Julien Grall wrote:
> Many PV drivers contain the idiom:
> 
> pfn = page_to_gfn(...) /* Or similar */
> gnttab_grant_foreign_access_ref
> 
> Replace it by a new helper. Note that when Linux is using a different
> page granularity than Xen, the helper only gives access to the first 4KB
> grant.
> 
> This is useful where drivers are allocating a full Linux page for each
> grant.
> 
> Also include xen/interface/grant_table.h rather than xen/grant_table.h in
> asm/page.h for x86 to fix a compilation issue [1]. Only the former is
> useful in order to get the structure definition.
> 
> [1] Interdependency between asm/page.h and xen/grant_table.h which result
> to page_mfn not being defined when necessary.
> 
> Signed-off-by: Julien Grall <julien.grall@...aro.org>

Hmmm... this should be julien.grall@...rix.com. Still mixing up with my
old address.

I've fixed it in the branch associated to this series.

Regards,

-- 
Julien Grall
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