From b024a8d082a96a9c9d0151d0aeb864f67a4e9fcb Mon Sep 17 00:00:00 2001
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Sat, 18 Apr 2026 21:47:02 +0300
Subject: membarrier.2: document MEMBARRIER_CMD_GET_REGISTRATIONS

(cherry picked from commit 324b3c2892a53e5fd9b1d8795a31a59ee835c5de)
---
 lib/libsys/membarrier.2 | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'lib')

diff --git a/lib/libsys/membarrier.2 b/lib/libsys/membarrier.2
index 87db620975ef..1dce2c823022 100644
--- a/lib/libsys/membarrier.2
+++ b/lib/libsys/membarrier.2
@@ -83,6 +83,8 @@ CPU are fenced.
 Register the process to receive
 .Dv MEMBARRIER_CMD_PRIVATE_EXPEDITED_SYNC_CORE
 memory barriers.
+.It Dv MEMBARRIER_CMD_GET_REGISTRATIONS
+Return the bitmask of the currently registered receive barriers.
 .El
 .Pp
 The following
@@ -106,6 +108,10 @@ If the
 is
 .Dv MEMBARRIER_CMD_QUERY
 a bitmask of supported commands is returned.
+For the
+.Dv MEMBARRIER_CMD_GET_REGISTRATIONS
+command, a bitmask of the registrations for the current process
+is returned.
 Otherwise, on success,
 .Nm
 returns 0.
-- 
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