Previous patch revoked following objections.

src/backend/access/transam/xlog.c

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.402 2010/04/23 19:57:18 sriggs Exp $
+ * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.403 2010/04/23 20:21:31 sriggs Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -5568,12 +5568,7 @@ CheckRequiredParameterValues(CheckPoint checkPoint)
 	RecoveryRequiresIntParameter("max_locks_per_xact",
 						  max_locks_per_xact, checkPoint.max_locks_per_xact);
 
-	/*
-	 * Hot Standby currently only depends upon the presence of WAL
-	 * records as indicated by XLOG_MODE_HOT_STANDBY. There is no current
-	 * dependency on whether archiving or streaming are enabled, if either.
-	 */
-	if (!(checkPoint.XLogModeFlags & XLOG_MODE_HOT_STANDBY))
+	if (!checkPoint.XLogStandbyInfoMode)
 		ereport(ERROR,
 				(errmsg("recovery connections cannot start because the recovery_connections "
 						"parameter is disabled on the WAL source server")));
@@ -7007,13 +7002,7 @@ CreateCheckPoint(int flags)
 	checkPoint.MaxConnections = MaxConnections;
 	checkPoint.max_prepared_xacts = max_prepared_xacts;
 	checkPoint.max_locks_per_xact = max_locks_per_xact;
-
-	if (XLogArchivingActive())
-		checkPoint.XLogModeFlags |= XLOG_MODE_ARCHIVING;
-	if (max_wal_senders > 0)
-		checkPoint.XLogModeFlags |= XLOG_MODE_STREAMING;
-	if (XLogRequestRecoveryConnections)
-		checkPoint.XLogModeFlags |= XLOG_MODE_HOT_STANDBY;
+	checkPoint.XLogStandbyInfoMode = XLogStandbyInfoActive();
 
 	/*
 	 * We must hold WALInsertLock while examining insert state to determine

src/include/catalog/pg_control.h

@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/catalog/pg_control.h,v 1.52 2010/04/23 19:57:19 sriggs Exp $
+ * $PostgreSQL: pgsql/src/include/catalog/pg_control.h,v 1.53 2010/04/23 20:21:31 sriggs Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -45,7 +45,7 @@ typedef struct CheckPoint
 	int			MaxConnections;
 	int			max_prepared_xacts;
 	int			max_locks_per_xact;
-	int			XLogModeFlags;
+	bool		XLogStandbyInfoMode;
 
 	/*
 	 * Oldest XID still running. This is only needed to initialize hot standby
@@ -65,10 +65,6 @@ typedef struct CheckPoint
 #define XLOG_BACKUP_END					0x50
 #define XLOG_UNLOGGED					0x60
 
-/* XLogModeFlags */
-#define XLOG_MODE_ARCHIVING				(1 << 0)
-#define XLOG_MODE_STREAMING				(1 << 1)
-#define XLOG_MODE_HOT_STANDBY			(1 << 2)
 
 /* System status indicator */
 typedef enum DBState