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Clarify locking for PageGetLSN() in XLogCheckBuffer()

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Lines changed: 2 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1212,7 +1212,8 @@ XLogCheckBuffer(XLogRecData *rdata, bool doPageWrites,`
`1212`	`1212`	`/*`
`1213`	`1213`	`* XXX We assume page LSN is first data on every page that can be passed`
`1214`	`1214`	`* to XLogInsert, whether it otherwise has the standard page layout or`
`1215`		`- * not.`
	`1215`	`+ * not. We don't need the buffer header lock for PageGetLSN because we`
	`1216`	`+ * have exclusive lock on the page and/or the relation.`
`1216`	`1217`	`*/`
`1217`	`1218`	`*lsn=PageGetLSN(page);`
`1218`	`1219`

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