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Thu, 04 Mar 2021 01:22:19 -0800 (PST) Received: from [192.168.1.143] ([170.253.51.130]) by smtp.gmail.com with ESMTPSA id p10sm21724284wrw.33.2021.03.04.01.22.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 04 Mar 2021 01:22:19 -0800 (PST) Subject: Re: [PATCH 1/4] userfaultfd.2: Add UFFD_FEATURE_THREAD_ID docs To: Peter Xu Cc: Mike Rapoport , Nadav Amit , linux-kernel@vger.kernel.org, Linux MM Mailing List , Axel Rasmussen , Andrea Arcangeli , Andrew Morton , Michael Kerrisk , linux-man@vger.kernel.org References: <20210304015947.517713-1-peterx@redhat.com> <20210304015947.517713-2-peterx@redhat.com> From: "Alejandro Colomar (man-pages)" Message-ID: Date: Thu, 4 Mar 2021 10:22:18 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.0 MIME-Version: 1.0 In-Reply-To: <20210304015947.517713-2-peterx@redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: B72292000392 X-Stat-Signature: rxdmf9uu35gbei9864bh6wrjkb1txjgb Received-SPF: none (gmail.com>: No applicable sender policy available) receiver=imf11; identity=mailfrom; envelope-from=""; helo=mail-wr1-f52.google.com; client-ip=209.85.221.52 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1614849739-619676 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: Hello Peter, On 3/4/21 2:59 AM, Peter Xu wrote: > UFFD_FEATURE_THREAD_ID is supported since Linux 4.14. > > Signed-off-by: Peter Xu > --- > man2/userfaultfd.2 | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/man2/userfaultfd.2 b/man2/userfaultfd.2 > index e7dc9f813..2d14effc6 100644 > --- a/man2/userfaultfd.2 > +++ b/man2/userfaultfd.2 > @@ -77,6 +77,12 @@ When the last file descriptor referring to a userfaultfd object is closed, > all memory ranges that were registered with the object are unregistered > and unread events are flushed. > .\" > +.PP > +Since Linux 4.14, userfaultfd page fault message can selectively embed fault > +thread ID information into the fault message. One needs to enable this feature > +explicitly using the > +.BR UFFD_FEATURE_THREAD_ID This should use [.B] and not [.BR]. .BR is for alternate Bold and Roman. .B is for bold. (There are more appearances of this in the other patches.) Thanks, Alex -- Alejandro Colomar Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/ http://www.alejandro-colomar.es/