linux-kernel - Re: [Xen-devel] [PATCH v3 04/20] xen/grant: Introduce helpers to split a page into grant

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Message-ID: <55D5A337.7090704@citrix.com>
Date:	Thu, 20 Aug 2015 10:51:51 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Julien Grall <julien.grall@...rix.com>,
	<xen-devel@...ts.xenproject.org>
CC:	<x86@...nel.org>, <ian.campbell@...rix.com>,
	<stefano.stabellini@...citrix.com>, <linux-kernel@...r.kernel.org>,
	"Ingo Molnar" <mingo@...hat.com>,
	David Vrabel <david.vrabel@...rix.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Xen-devel] [PATCH v3 04/20] xen/grant: Introduce helpers to
 split a page into grant

On 07/08/15 17:46, Julien Grall wrote:
> Currently, a grant is always based on the Xen page granularity (i.e
> 4KB). When Linux is using a different page granularity, a single page
> will be split between multiple grants.
> 
> The new helpers will be in charge to split the Linux page into grants and
> call a function given by the caller on each grant.
> 
> Also provide an helper to count the number of grants within a given
> contiguous region.
> 
> Note that the x86/include/asm/xen/page.h is now including
> xen/interface/grant_table.h rather than xen/grant_table.h. It's
> necessary because xen/grant_table.h depends on asm/xen/page.h and will
> break the compilation. Furthermore, only definition in
> interface/grant_table.h was required.

Reviewed-by: David Vrabel <david.vrabel@...rix.com>

But...

> +/* Helper to get to call fn only on the first "grant chunk" */
> +static inline void gnttab_one_grant(struct page *page, unsigned int offset,
> +				    unsigned len, xen_grant_fn_t fn,
> +				    void *data)

...call this gnttab_for_one_grant().

David
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