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Fri, 20 Jul 2018 14:08:11 +0000 Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by userv0022.oracle.com (8.14.4/8.14.4) with ESMTP id w6KE8AMo006686 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 20 Jul 2018 14:08:10 GMT Received: from abhmp0008.oracle.com (abhmp0008.oracle.com [141.146.116.14]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id w6KE89Dh028894; Fri, 20 Jul 2018 14:08:09 GMT Received: from dhcp-burlington7-2nd-B-east-10-152-55-162.usdhcp.oraclecorp.com (/10.152.32.65) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 20 Jul 2018 07:08:09 -0700 Subject: Re: [PATCH v5 0/8] xen: dma-buf support for grant device To: Oleksandr Andrushchenko , xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org, jgross@suse.com, konrad.wilk@oracle.com Cc: daniel.vetter@intel.com, dongwon.kim@intel.com, matthew.d.roper@intel.com, Oleksandr Andrushchenko References: <20180720090150.24560-1-andr2000@gmail.com> From: Boris Ostrovsky Openpgp: preference=signencrypt Autocrypt: addr=boris.ostrovsky@oracle.com; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: <20180720090150.24560-1-andr2000@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=8959 signatures=668706 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1806210000 definitions=main-1807200160 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/20/2018 05:01 AM, Oleksandr Andrushchenko wrote: > From: Oleksandr Andrushchenko > > 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 ‘xen_drm_front_fb_to_cookie’: /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;          ^ /data/upstream/linux-xen/drivers/gpu/drm/xen/xen_drm_front.h: In function ‘xen_drm_front_dbuf_to_cookie’: /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;          ^   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 ‘xen_drm_front_fb_to_cookie’:   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 ‘gntdev_ioctl_dmabuf_exp_from_refs’: /data/upstream/linux-xen/drivers/xen/gntdev-dmabuf.c:503:6: warning: ‘args.fd’ may be used uninitialized in this function [-Wmaybe-uninitialized]   *fd = args.fd;   ~~~~^~~~~~~~~ /data/upstream/linux-xen/drivers/xen/gntdev-dmabuf.c:467:35: note: ‘args.fd’ was declared here   struct gntdev_dmabuf_export_args args;                                    ^~~~ -boris