From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f69.google.com (mail-wm0-f69.google.com [74.125.82.69]) by kanga.kvack.org (Postfix) with ESMTP id D79686B0317 for ; Tue, 2 May 2017 05:31:28 -0400 (EDT) Received: by mail-wm0-f69.google.com with SMTP id i7so1004348wmf.19 for ; Tue, 02 May 2017 02:31:28 -0700 (PDT) Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com. [148.163.158.5]) by mx.google.com with ESMTPS id t190si505665wme.72.2017.05.02.02.31.27 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 02 May 2017 02:31:27 -0700 (PDT) Received: from pps.filterd (m0098416.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v4294Jqp125322 for ; Tue, 2 May 2017 05:31:26 -0400 Received: from e06smtp10.uk.ibm.com (e06smtp10.uk.ibm.com [195.75.94.106]) by mx0b-001b2d01.pphosted.com with ESMTP id 2a6g76d8fk-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 02 May 2017 05:31:26 -0400 Received: from localhost by e06smtp10.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 2 May 2017 10:31:23 +0100 Date: Tue, 2 May 2017 12:31:11 +0300 From: Mike Rapoport Subject: Re: [PATCH man-pages 1/5] ioctl_userfaultfd.2: update description of shared memory areas References: <1493617399-20897-1-git-send-email-rppt@linux.vnet.ibm.com> <1493617399-20897-2-git-send-email-rppt@linux.vnet.ibm.com> <7ec5dfc0-9d84-e142-bfaa-d96383acbee9@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <7ec5dfc0-9d84-e142-bfaa-d96383acbee9@gmail.com> Message-Id: <20170502093110.GA5910@rapoport-lnx> Sender: owner-linux-mm@kvack.org List-ID: To: "Michael Kerrisk (man-pages)" Cc: Andrea Arcangeli , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-man@vger.kernel.org On Mon, May 01, 2017 at 08:33:31PM +0200, Michael Kerrisk (man-pages) wrote: > Hello Mike, > > I've applied this patch, but have a question. > > On 05/01/2017 07:43 AM, Mike Rapoport wrote: > > Signed-off-by: Mike Rapoport > > --- > > man2/ioctl_userfaultfd.2 | 13 +++++++++++-- > > 1 file changed, 11 insertions(+), 2 deletions(-) > > > > diff --git a/man2/ioctl_userfaultfd.2 b/man2/ioctl_userfaultfd.2 > > index 889feb9..6edd396 100644 > > --- a/man2/ioctl_userfaultfd.2 > > +++ b/man2/ioctl_userfaultfd.2 > > @@ -181,8 +181,17 @@ virtual memory areas > > .TP > > .B UFFD_FEATURE_MISSING_SHMEM > > If this feature bit is set, > > -the kernel supports registering userfaultfd ranges on tmpfs > > -virtual memory areas > > +the kernel supports registering userfaultfd ranges on shared memory areas. > > +This includes all kernel shared memory APIs: > > +System V shared memory, > > +tmpfs, > > +/dev/zero, > > +.BR mmap(2) > > +with > > +.I MAP_SHARED > > +flag set, > > +.BR memfd_create (2), > > +etc. > > > > The returned > > .I ioctls > > Does the change in this patch represent a change that occurred in > Linux 4.11? If so, I think this needs to be said explicitly in the text. The patch only extends the description of UFFD_FEATURE_MISSING_SHMEM. The feature is indeed available from 4.11, but that is said a few lives above (line 136 in ioctl_userfaultfd.2) > Cheers, > > Michael > > > > -- > Michael Kerrisk > Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ > Linux/UNIX System Programming Training: http://man7.org/training/ > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org