RE: [PATCH 2/2] drm/hyperv: use VMBUS_RING_SIZE()

[Saurabh Singh Sengar]

> Subject: [PATCH 2/2] drm/hyperv: use VMBUS_RING_SIZE()
> 
> VMBUS ring buffers must be page aligned. So, use VMBUS_RING_SIZE() to
> ensure they are always aligned and large enough to hold all of the relevant
> data.
> 
> Cc: stable@xxxxxxxxxxxxxxx
> Fixes: 76c56a5affeb ("drm/hyperv: Add DRM driver for hyperv synthetic video
> device")
> Signed-off-by: Hamza Mahfooz <hamzamahfooz@xxxxxxxxxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/hyperv/hyperv_drm_proto.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/hyperv/hyperv_drm_proto.c
> b/drivers/gpu/drm/hyperv/hyperv_drm_proto.c
> index 051ecc526832..753d97bff76f 100644
> --- a/drivers/gpu/drm/hyperv/hyperv_drm_proto.c
> +++ b/drivers/gpu/drm/hyperv/hyperv_drm_proto.c
> @@ -10,7 +10,7 @@
> 
>  #include "hyperv_drm.h"
> 
> -#define VMBUS_RING_BUFSIZE (256 * 1024)
> +#define VMBUS_RING_BUFSIZE VMBUS_RING_SIZE(256 * 1024)
>  #define VMBUS_VSP_TIMEOUT (10 * HZ)
> 
>  #define SYNTHVID_VERSION(major, minor) ((minor) << 16 | (major))
> --
> 2.54.0

Although this lgtm, but this may change the behaviour on ARM64 systems with page size > 4K ?
Have we tested it ?

Reviewed-by: Saurabh Sengar <ssengar@xxxxxxxxxxxxxxxxxxx>