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[174.95.95.253]) by smtp.gmail.com with ESMTPSA id b7sm19837826qkj.115.2021.03.04.08.12.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 04 Mar 2021 08:12:44 -0800 (PST) Date: Thu, 4 Mar 2021 11:12:43 -0500 From: Peter Xu To: linux-man@vger.kernel.org Cc: Mike Rapoport , Nadav Amit , linux-kernel@vger.kernel.org, Linux MM Mailing List , Axel Rasmussen , Alejandro Colomar , Andrea Arcangeli , Andrew Morton , Michael Kerrisk Subject: Re: [PATCH 4/4] ioctl_userfaultfd.2: Add write-protect mode docs Message-ID: <20210304161243.GA397383@xz-x1> References: <20210304015947.517713-1-peterx@redhat.com> <20210304015947.517713-5-peterx@redhat.com> MIME-Version: 1.0 In-Reply-To: <20210304015947.517713-5-peterx@redhat.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=peterx@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline X-Stat-Signature: q87eipajmou8u8hybd6fjk5ukdnysfgd X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 3E322A0049D9 Received-SPF: none (redhat.com>: No applicable sender policy available) receiver=imf07; identity=mailfrom; envelope-from=""; helo=us-smtp-delivery-124.mimecast.com; client-ip=216.205.24.124 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1614874369-459718 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Mar 03, 2021 at 08:59:47PM -0500, Peter Xu wrote: > Userfaultfd write-protect mode is supported starting from Linux 5.7. > > Signed-off-by: Peter Xu > --- > man2/ioctl_userfaultfd.2 | 74 +++++++++++++++++++++++++++++++++++++--- > 1 file changed, 70 insertions(+), 4 deletions(-) > > diff --git a/man2/ioctl_userfaultfd.2 b/man2/ioctl_userfaultfd.2 > index 1965d1932..3feb888a8 100644 > --- a/man2/ioctl_userfaultfd.2 > +++ b/man2/ioctl_userfaultfd.2 > @@ -208,10 +208,11 @@ signal will be sent to the faulting process. > Applications using this > feature will not require the use of a userfaultfd monitor for processing > memory accesses to the regions registered with userfaultfd. > +.TP > .BR UFFD_FEATURE_THREAD_ID " (since Linux 4.14)" > If this feature bit is set, > .I uffd_msg.pagefault.feat.ptid > -Will be set > +will be set to the faulted thread ID for each page fault message. These two changes should belong to the previous patch - will get them fixed too. -- Peter Xu