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Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.973.16; Mon, 23 Jul 2018 13:26:35 +0000 Subject: Re: [PATCH v5 0/8] xen: dma-buf support for grant device From: Oleksandr Andrushchenko To: Boris Ostrovsky , 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 References: <20180720090150.24560-1-andr2000@gmail.com> <019c0eb6-8185-d888-ae6f-305ea2d44124@oracle.com> Message-ID: <80a074ac-91db-82db-d094-660d859cf903@epam.com> Date: Mon, 23 Jul 2018 16:26:30 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Originating-IP: [85.223.209.53] 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epam.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Jul 2018 13:26:35.4539 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0675f527-93d5-4c82-a527-08d5f09fea46 X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: b41b72d0-4e9f-4c26-8a69-f949f367c91d X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR0302MB3204 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/23/2018 11:38 AM, Oleksandr Andrushchenko wrote: > On 07/20/2018 05:08 PM, Boris Ostrovsky wrote: >> 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) >> > The above warnings already have a fix [1] which is expected in 4.19 >> >> 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; >>                                     ^~~~ > Strangely, but my i386 build goes smooth. > Which version of gcc you use and could you please give me your > .config, so I can test the same? Now I see this warning which seems to be a false positive. Boris, could you please apply the following: diff --git a/drivers/xen/gntdev-dmabuf.c b/drivers/xen/gntdev-dmabuf.c index e4c9f1f74476..0680dbcba616 100644 --- a/drivers/xen/gntdev-dmabuf.c +++ b/drivers/xen/gntdev-dmabuf.c @@ -495,6 +495,7 @@ static int dmabuf_exp_from_refs(struct gntdev_priv *priv, int flags,         args.dmabuf_priv = priv->dmabuf_priv;         args.count = map->count;         args.pages = map->pages; +       args.fd = -1;         ret = dmabuf_exp_from_pages(&args);         if (ret < 0) or please let me know if you want me to resend with this fix? >> >> -boris > Thank you, > Oleksandr > > [1] > https://cgit.freedesktop.org/drm/drm-misc/commit/?id=9eece5d9c6e0316f17091e37ff3ec87331bdedf3 Thank you, Oleksandr