linux-kernel - Re: [PATCH kernel] vfio: Add explicit alignments in vfio_iommu_spapr_tce

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Date:	Tue, 22 Dec 2015 13:09:37 -0700
From:	Alex Williamson <alex.williamson@...hat.com>
To:	Alexey Kardashevskiy <aik@...abs.ru>
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	David Gibson <david@...son.dropbear.id.au>
Subject: Re: [PATCH kernel] vfio: Add explicit alignments in
 vfio_iommu_spapr_tce_create

On Fri, 2015-12-18 at 12:35 +1100, Alexey Kardashevskiy wrote:
> The vfio_iommu_spapr_tce_create struct has 4x32bit and 2x64bit fields
> which should have resulted in sizeof(fio_iommu_spapr_tce_create)
> equal
> to 32 bytes. However due to the gcc's default alignment, the actual
> size of this struct is 40 bytes.
> 
> This fills gaps with __resv1/2 fields.
> 
> This should not cause any change in behavior.
> 
> Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
> ---

Applied to next for v4.5 with David's ack.  Thanks!

Alex

>  include/uapi/linux/vfio.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
> index 9fd7b5d..d117233 100644
> --- a/include/uapi/linux/vfio.h
> +++ b/include/uapi/linux/vfio.h
> @@ -568,8 +568,10 @@ struct vfio_iommu_spapr_tce_create {
>  	__u32 flags;
>  	/* in */
>  	__u32 page_shift;
> +	__u32 __resv1;
>  	__u64 window_size;
>  	__u32 levels;
> +	__u32 __resv2;
>  	/* out */
>  	__u64 start_addr;
>  };

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