Re: [PATCH 20/24] xen: update xen_add_to_physmap interface

[Mukesh Rathor]

On Wed, 1 Aug 2012 10:52:15 -0400
Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote:

> On Thu, Jul 26, 2012 at 04:34:02PM +0100, Stefano Stabellini wrote:
> > Update struct xen_add_to_physmap to be in sync with Xen's version
> > of the structure.
> > The size field was introduced by:
> > 
> > changeset:   24164:707d27fe03e7
> > user:        Jean Guyader <jean.guyader@xxxxxxxxxxxxx>
> > date:        Fri Nov 18 13:42:08 2011 +0000
> > summary:     mm: New XENMEM space, XENMAPSPACE_gmfn_range
> > 
> > According to the comment:
> > 
> > "This new field .size is located in the 16 bits padding
> > between .domid and .space in struct xen_add_to_physmap to stay
> > compatible with older versions."
> > 
> > This is not true on ARM where there is not padding, but it is valid
> > on X86, so introducing size is safe on X86 and it is going to fix
> > the interace for ARM.
> 
> Has this been checked actually for backwards compatibility? It sounds
> like it should work just fine with Xen 4.0 right?
> 
> I believe this also helps Mukesh's patches, so CC-ing him here for
> his Ack.

Yup, I already had that change in my tree.

thanks,
Mukesh


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