linux-kernel - Re: [PATCH 03/10] xen/hypercall: Make xen_remove_from

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Message-ID: <1351071622.2237.130.camel@zakaz.uk.xensource.com>
Date:	Wed, 24 Oct 2012 10:40:22 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	"mukesh.rathor@...cle.com" <mukesh.rathor@...cle.com>
Subject: Re: [PATCH 03/10] xen/hypercall: Make xen_remove_from_physmap the
 same on 64/32 builds.

On Tue, 2012-10-23 at 19:12 +0100, Konrad Rzeszutek Wilk wrote:
> By making the structure exactly the same size and with the same
> offsets on 64 and 32-bit builds we are future-proofing ourselves.
> 
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> ---
>  include/xen/interface/memory.h |    7 ++++++-
>  1 files changed, 6 insertions(+), 1 deletions(-)
> 
> diff --git a/include/xen/interface/memory.h b/include/xen/interface/memory.h
> index 8beebdb..6b07b54 100644
> --- a/include/xen/interface/memory.h
> +++ b/include/xen/interface/memory.h
> @@ -253,9 +253,14 @@ extern spinlock_t xen_reservation_lock;
>  struct xen_remove_from_physmap {
>      /* Which domain to change the mapping for. */
>      domid_t domid;
> -
> +   /* To be used in the future if need to. */
> +    uint8_t reserved[6];
>      /* GPFN of the current mapping of the page. */
>      xen_pfn_t gpfn;
> +#ifdef CONFIG_X86_32
> +    /* No need to do that on ARM as xen_pfn_t is always 8 bytes. */
> +    uint8_t __pad[4];
> +#endif

I'm not sure if this last one is necessary since this isn't a struct
which would get used in an array. I guess it doesn't hurt though.

>  };
>  DEFINE_GUEST_HANDLE_STRUCT(xen_remove_from_physmap);
>  


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