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Mon, 23 Jul 2018 15:22:35 +0000 Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userv0021.oracle.com (8.14.4/8.14.4) with ESMTP id w6NFMX8x027465 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 23 Jul 2018 15:22:34 GMT Received: from abhmp0013.oracle.com (abhmp0013.oracle.com [141.146.116.19]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id w6NFMX8A004114; Mon, 23 Jul 2018 15:22:33 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 ; Mon, 23 Jul 2018 08:22:33 -0700 Subject: Re: [PATCH v5 0/8] xen: dma-buf support for grant device To: Oleksandr Andrushchenko , 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> <80a074ac-91db-82db-d094-660d859cf903@epam.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: <80a074ac-91db-82db-d094-660d859cf903@epam.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=8962 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-1807230174 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/23/2018 09:26 AM, Oleksandr Andrushchenko wrote: > On 07/23/2018 11:38 AM, Oleksandr Andrushchenko wrote: >> >>> 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? Missed this message. Yes, this obviously fixes the problem. And it is due to the code fragment that I mentioned in the earlier response. Which patch is this for? I can add this when committing. -boris