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Mon, 17 Sep 2018 20:08:14 +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 w8HK8DVA003764 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 17 Sep 2018 20:08:13 GMT Received: from abhmp0011.oracle.com (abhmp0011.oracle.com [141.146.116.17]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id w8HK8D4r019213; Mon, 17 Sep 2018 20:08:13 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, 17 Sep 2018 13:08:12 -0700 Subject: Re: [PATCH 3/6] xenbus: dispatch per-domU watch event to per-domU xenwatch thread To: Dongli Zhang , xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org Cc: jgross@suse.com, paul.durrant@citrix.com, wei.liu2@citrix.com, konrad.wilk@oracle.com, roger.pau@citrix.com, srinivas.eeda@oracle.com References: <1536910456-13337-1-git-send-email-dongli.zhang@oracle.com> <1536910456-13337-4-git-send-email-dongli.zhang@oracle.com> From: Boris Ostrovsky Openpgp: preference=signencrypt Autocrypt: addr=boris.ostrovsky@oracle.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.0 MIME-Version: 1.0 In-Reply-To: <1536910456-13337-4-git-send-email-dongli.zhang@oracle.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9019 signatures=668708 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=8.0.1-1807170000 definitions=main-1809170199 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9/14/18 3:34 AM, Dongli Zhang wrote: > > +static int xs_watch_insert_event(struct xs_watch_event *event, domid_t domid) > +{ > + struct mtwatch_domain *domain; > + int ret = -1; -ENODEV maybe? -boris > + > + rcu_read_lock(); > + > + domain = mtwatch_find_domain(domid); > + if (!domain) { > + rcu_read_unlock(); > + return ret; > + } > + > + spin_lock(&domain->events_lock); > + if (domain->state == MTWATCH_DOMAIN_UP) { > + list_add_tail(&event->list, &domain->events); > + wake_up(&domain->events_wq); > + ret = 0; > + } > + spin_unlock(&domain->events_lock); > + > + rcu_read_unlock(); > + > + return ret; > +} > + >