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Wed, 28 Feb 2018 03:26:23 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:58744 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751882AbeB1I0W (ORCPT ); Wed, 28 Feb 2018 03:26:22 -0500 Date: Wed, 28 Feb 2018 10:26:14 +0200 From: Mike Rapoport To: Pavel Emelyanov Cc: Andrew Morton , Andrea Arcangeli , linux-mm , linux-api , lkml , crml Subject: Re: [PATCH 3/3] userfaultfd: non-cooperative: allow synchronous EVENT_REMOVE References: <1519719592-22668-1-git-send-email-rppt@linux.vnet.ibm.com> <1519719592-22668-4-git-send-email-rppt@linux.vnet.ibm.com> <1a2ed216-74ac-5fe2-abff-21d670eeb96d@virtuozzo.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1a2ed216-74ac-5fe2-abff-21d670eeb96d@virtuozzo.com> User-Agent: Mutt/1.5.24 (2015-08-30) X-TM-AS-GCONF: 00 x-cbid: 18022808-0040-0000-0000-0000041836D1 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18022808-0041-0000-0000-0000261B3853 Message-Id: <20180228082613.GD15048@rapoport-lnx> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2018-02-28_05:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1802280102 Sender: linux-api-owner@vger.kernel.org X-Mailing-List: linux-api@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On Wed, Feb 28, 2018 at 11:21:02AM +0300, Pavel Emelyanov wrote: > > > @@ -52,6 +53,7 @@ > > #define _UFFDIO_WAKE (0x02) > > #define _UFFDIO_COPY (0x03) > > #define _UFFDIO_ZEROPAGE (0x04) > > +#define _UFFDIO_WAKE_SYNC_EVENT (0x05) > > Excuse my ignorance, but what's the difference between UFFDIO_WAKE and UFFDIO_WAKE_SYNC_EVENT? UFFDIO_WAKE is used when UFFDIO_COPY/UFFDIO_ZERO page are used with UFFDIO_*_MODE_DONTWAKE flag set and it presumes 'struct uffdio_range' argument to the ioctl(). Since waking up a non page fault event requires different parameters I've add new ioctl to keep backwards compatibility. > -- Pavel > -- Sincerely yours, Mike.