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Add parens to ConvertToXSegs macro

The current definition is dangerous. No bugs exist in our code atpresent, but backpatch to 11 nonetheless where it was introduced.Author: Álvaro Herrera <alvherre@alvh.no-ip.org>

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src/backend/access/transam
- xlog.c

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`‎src/backend/access/transam/xlog.c`

Lines changed: 5 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -744,9 +744,12 @@ static ControlFileData *ControlFile = NULL;`
`744`	`744`	`*/`
`745`	`745`	`#defineUsableBytesInPage (XLOG_BLCKSZ - SizeOfXLogShortPHD)`
`746`	`746`
`747`		`-/* Convert min_wal_size_mb and max wal_size_mb to equivalent segment count */`
	`747`	`+/*`
	`748`	`+ * Convert min_wal_size_mb and max wal_size_mb to equivalent segment count.`
	`749`	`+ * Rounds down.`
	`750`	`+ */`
`748`	`751`	`#defineConvertToXSegs(x,segsize)\`
`749`		`-(x / ((segsize) / (1024 * 1024)))`
	`752`	`+((x) / ((segsize) / (1024 * 1024)))`
`750`	`753`
`751`	`754`	`/* The number of bytes in a WAL segment usable for WAL data. */`
`752`	`755`	`staticintUsableBytesInSegment;`

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Commit013d324

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`‎src/backend/access/transam/xlog.c`

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