v12-0017-bufmgr-Fix-use-of-wrong-variable-in-GetPrivateRe.patch

From f1425b878c119d90909009a1ca97a5ba89565e65 Mon Sep 17 00:00:00 2001
From: Andres Freund <andres@anarazel.de>
Date: Tue, 3 Mar 2026 16:52:24 -0500
Subject: [PATCH v12 17/23] bufmgr: Fix use of wrong variable in
 GetPrivateRefCountEntrySlow()

Unfortunately I made GetPrivateRefCountEntrySlow() set a wrong cache hint when
moving entries from the hash table to the faster array.  There are no
correctness concerns due to this, just an unnecessary loss of performance.

Author:
Reviewed-by:
Discussion: https://postgr.es/m/
Backpatch:
---
 src/backend/storage/buffer/bufmgr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index 0de3ee932..a4a3e024b 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -503,7 +503,7 @@ GetPrivateRefCountEntrySlow(Buffer buffer, bool do_move)
 		free->data = data;
 		PrivateRefCountArrayKeys[ReservedRefCountSlot] = buffer;
 		/* update cache for the next lookup */
-		PrivateRefCountEntryLast = match;
+		PrivateRefCountEntryLast = ReservedRefCountSlot;
 
 		ReservedRefCountSlot = -1;
 
-- 
2.53.0