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From:   Peter Xu <peterx@redhat.com>
To:     linux-man@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org
Cc:     Andrea Arcangeli <aarcange@redhat.com>,
        Mike Rapoport <rppt@linux.vnet.ibm.com>,
        Axel Rasmussen <axelrasmussen@google.com>,
        Alejandro Colomar <alx.manpages@gmail.com>, peterx@redhat.com,
        Michael Kerrisk <mtk.manpages@gmail.com>,
        Nadav Amit <nadav.amit@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>
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>
In-Reply-To: <20210322220848.52162-1-peterx@redhat.com>
References: <20210322220848.52162-1-peterx@redhat.com>
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UFFD_FEATURE_THREAD_ID is supported in Linux 4.14.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 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
-- 
2.26.2