From 181361a0c2fec635de10e101f683da9bddbb8178 Mon Sep 17 00:00:00 2001
From: Thomas Munro <tmunro@postgresql.org>
Date: Tue, 26 Oct 2021 12:54:55 +1300
Subject: Reject huge_pages=on if shared_memory_type=sysv.

It doesn't work (it could, but hasn't been implemented).
Back-patch to 12, where shared_memory_type arrived.

Reported-by: Alexander Lakhin <exclusion@gmail.com>
Reviewed-by: Alexander Lakhin <exclusion@gmail.com>
Discussion: https://postgr.es/m/163271880203.22789.1125998876173795966@wrigleys.postgresql.org
---
 doc/src/sgml/config.sgml | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'doc/src')

diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 0c3193bfebb..b5d06b49e29 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1664,7 +1664,9 @@ include_dir 'conf.d'
        <para>
         At present, this setting is supported only on Linux and Windows. The
         setting is ignored on other systems when set to
-        <literal>try</literal>.
+        <literal>try</literal>.  On Linux, it is only supported when
+        <varname>shared_memory_type</varname> is set to <literal>mmap</literal>
+        (the default).
        </para>
 
        <para>
-- 
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