From f6826e031c454887bd58188f728f0f8dfa9418e5 Mon Sep 17 00:00:00 2001
From: alvherre <alvherre>
Date: Mon, 20 Oct 2008 21:11:15 +0000
Subject: [PATCH] Properly access a buffer's LSN using existing access macros
 instead of abusing knowledge of page layout.

Stolen from Jonah Harris' CRC patch
---
 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 53d7819c01..560293d372 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -48,7 +48,7 @@
 
 /* Note: these two macros only work on shared buffers, not local ones! */
 #define BufHdrGetBlock(bufHdr)	((Block) (BufferBlocks + ((Size) (bufHdr)->buf_id) * BLCKSZ))
-#define BufferGetLSN(bufHdr)	(*((XLogRecPtr*) BufHdrGetBlock(bufHdr)))
+#define BufferGetLSN(bufHdr)	(PageGetLSN(BufHdrGetBlock(bufHdr)))
 
 /* Note: this macro only works on local buffers, not shared ones! */
 #define LocalBufHdrGetBlock(bufHdr) \
-- 
2.11.4.GIT