[PATCH 4/4] qapi/char: Deprecate backend type "memory"

[Markus Armbruster <armbru@redhat.com>]

It's an alias for "ringbuf" we kept for backward compatibility; see
commit 3a1da42eb35 (qapi: Rename ChardevBackend member "memory" to
"ringbuf").  Deprecation is long overdue.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 docs/about/deprecated.rst | 8 ++++++++
 qapi/char.json            | 8 +++++---
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
index d4492b9460..ae1a520c26 100644
--- a/docs/about/deprecated.rst
+++ b/docs/about/deprecated.rst
@@ -371,6 +371,14 @@ Specifying the iSCSI password in plain text on the command line using the
 used instead, to refer to a ``--object secret...`` instance that provides
 a password via a file, or encrypted.
 
+Character device options
+''''''''''''''''''''''''
+
+Backend ``memory`` (since 9.0)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+``memory`` is a deprecated synonym for ``ringbuf``.
+
 CPU device properties
 '''''''''''''''''''''
 
diff --git a/qapi/char.json b/qapi/char.json
index 2d74e66746..75a7e057f0 100644
--- a/qapi/char.json
+++ b/qapi/char.json
@@ -468,6 +468,10 @@
 #
 # @memory: Since 1.5
 #
+# Features:
+#
+# @deprecated: Member @memory is deprecated.  Use @ringbuf instead.
+#
 # Since: 1.4
 ##
 { 'enum': 'ChardevBackendKind',
@@ -492,8 +496,7 @@
             { 'name': 'dbus', 'if': 'CONFIG_DBUS_DISPLAY' },
             'vc',
             'ringbuf',
-            # next one is just for compatibility
-            'memory' ] }
+            { 'name': 'memory', 'features': [ 'deprecated' ] } ] }
 
 ##
 # @ChardevFileWrapper:
@@ -642,7 +645,6 @@
                       'if': 'CONFIG_DBUS_DISPLAY' },
             'vc': 'ChardevVCWrapper',
             'ringbuf': 'ChardevRingbufWrapper',
-            # next one is just for compatibility
             'memory': 'ChardevRingbufWrapper' } }
 
 ##
-- 
2.43.0