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[174.91.135.175]) by smtp.gmail.com with ESMTPSA id x1sm9627850qtr.97.2021.03.22.15.08.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 22 Mar 2021 15:08:54 -0700 (PDT) From: Peter Xu To: linux-man@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Andrea Arcangeli , Mike Rapoport , Axel Rasmussen , Alejandro Colomar , peterx@redhat.com, Michael Kerrisk , Nadav Amit , Andrew Morton Subject: [PATCH v4 3/4] ioctl_userfaultfd.2: Add UFFD_FEATURE_THREAD_ID docs Date: Mon, 22 Mar 2021 18:08:47 -0400 Message-Id: <20210322220848.52162-4-peterx@redhat.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210322220848.52162-1-peterx@redhat.com> References: <20210322220848.52162-1-peterx@redhat.com> MIME-Version: 1.0 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="US-ASCII" X-Stat-Signature: ri8x3ompuqmgukadek4t1jrothx6piw1 X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: CADA3D5 Received-SPF: none (redhat.com>: No applicable sender policy available) receiver=imf20; identity=mailfrom; envelope-from=""; helo=us-smtp-delivery-124.mimecast.com; client-ip=170.10.133.124 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1616450945-610583 Content-Transfer-Encoding: quoted-printable 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: UFFD_FEATURE_THREAD_ID is supported in Linux 4.14. Signed-off-by: Peter Xu --- man2/ioctl_userfaultfd.2 | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/man2/ioctl_userfaultfd.2 b/man2/ioctl_userfaultfd.2 index 47ae5f473..d4a8375b8 100644 --- a/man2/ioctl_userfaultfd.2 +++ b/man2/ioctl_userfaultfd.2 @@ -208,6 +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 to the faulted thread ID for each page fault message. .PP The returned .I ioctls --=20 2.26.2