git: b024a8d082a9 - stable/15 - membarrier.2: document MEMBARRIER_CMD_GET_REGISTRATIONS

The branch stable/15 has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=b024a8d082a96a9c9d0151d0aeb864f67a4e9fcb

commit b024a8d082a96a9c9d0151d0aeb864f67a4e9fcb
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2026-04-18 18:47:02 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2026-04-27 01:28:59 +0000

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

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.