Re: [PATCH v5 0/8] xen: dma-buf support for grant device

[Boris Ostrovsky]

On 07/20/2018 05:01 AM, Oleksandr Andrushchenko wrote:
> From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
>
> This work is in response to my previous attempt to introduce Xen/DRM
> zero-copy driver [1] to enable Linux dma-buf API [2] for Xen based
> frontends/backends. There is also an existing hyper_dmabuf approach
> available [3] which, if reworked to utilize the proposed solution,
> can greatly benefit as well.


Lot of warnings on i386 build:

In file included from
/data/upstream/linux-xen/drivers/gpu/drm/xen/xen_drm_front.c:24:
/data/upstream/linux-xen/drivers/gpu/drm/xen/xen_drm_front.h: In
function âxen_drm_front_fb_to_cookieâ:
/data/upstream/linux-xen/drivers/gpu/drm/xen/xen_drm_front.h:129:9:
warning: cast from pointer to integer of different size
[-Wpointer-to-int-cast]
 return (u64)fb;
ÂÂÂÂÂÂÂÂ ^
/data/upstream/linux-xen/drivers/gpu/drm/xen/xen_drm_front.h: In
function âxen_drm_front_dbuf_to_cookieâ:
/data/upstream/linux-xen/drivers/gpu/drm/xen/xen_drm_front.h:134:9:
warning: cast from pointer to integer of different size
[-Wpointer-to-int-cast]
 return (u64)gem_obj;
ÂÂÂÂÂÂÂÂ ^
 CC [M] net/netfilter/ipset/ip_set_hash_ipport.o
 CC drivers/media/rc/keymaps/rc-tango.o
 CC [M] drivers/gpu/drm/vmwgfx/vmwgfx_fifo.o
 AR drivers/misc/built-in.a
In file included from
/data/upstream/linux-xen/drivers/gpu/drm/xen/xen_drm_front_kms.c:20:
/data/upstream/linux-xen/drivers/gpu/drm/xen/xen_drm_front.h: In
function âxen_drm_front_fb_to_cookieâ:
 CC [M] drivers/gpu/drm/xen/xen_drm_front_conn.o
/data/upstream/linux-xen/drivers/gpu/drm/xen/xen_drm_front.h:129:9:
warning: cast from pointer to integer of different size
[-Wpointer-to-int-cast]
 return (u64)fb;
(and more)



and then

data/upstream/linux-xen/drivers/xen/gntdev-dmabuf.c: In function
âgntdev_ioctl_dmabuf_exp_from_refsâ:
/data/upstream/linux-xen/drivers/xen/gntdev-dmabuf.c:503:6: warning:
âargs.fdâ may be used uninitialized in this function [-Wmaybe-uninitialized]
 *fd = args.fd;
 ~~~~^~~~~~~~~
/data/upstream/linux-xen/drivers/xen/gntdev-dmabuf.c:467:35: note:
âargs.fdâ was declared here
 struct gntdev_dmabuf_export_args args;
ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ ^~~~


-boris