[PATCH] docs/devel/qapi-code-gen: Discourage use of 'prefix'

[Markus Armbruster <armbru@redhat.com>]

QAPI's 'prefix' feature can make the connection between enumeration
type and its constants less than obvious.  It's best used with
restraint.  Commit 7bbadc60b5..64f5e9db77 eliminated most uses.
Discourage new ones.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 docs/devel/qapi-code-gen.rst | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/docs/devel/qapi-code-gen.rst b/docs/devel/qapi-code-gen.rst
index 9fa94251b0..f9cfe8721f 100644
--- a/docs/devel/qapi-code-gen.rst
+++ b/docs/devel/qapi-code-gen.rst
@@ -229,7 +229,8 @@ These are of the form PREFIX_NAME, where PREFIX is derived from the
 enumeration type's name, and NAME from the value's name.  For the
 example above, the generator maps 'MyEnum' to MY_ENUM and 'value1' to
 VALUE1, resulting in the enumeration constant MY_ENUM_VALUE1.  The
-optional 'prefix' member overrides PREFIX.
+optional 'prefix' member overrides PREFIX.  This is rarely necessary,
+and should be used with restraint.
 
 The generated C enumeration constants have values 0, 1, ..., N-1 (in
 QAPI schema order), where N is the number of values.  There is an
-- 
2.48.1