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Add parens to ConvertToXSegs macro 

The current definition is dangerous.  No bugs exist in our code at
present, but backpatch to 11 nonetheless where it was introduced.

Author: Álvaro Herrera <alvherre@alvh.no-ip.org>
This commit is contained in:
Alvaro Herrera 2020-06-24 14:00:37 -04:00
parent d3d8755180
commit 013d324d51
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1 changed files with 5 additions and 2 deletions
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7
src/backend/access/transam/xlog.c
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@ -744,9 +744,12 @@ static ControlFileData *ControlFile = NULL;
*/
#define UsableBytesInPage (XLOG_BLCKSZ - SizeOfXLogShortPHD)
/* Convert min_wal_size_mb and max wal_size_mb to equivalent segment count */
/*
* Convert min_wal_size_mb and max wal_size_mb to equivalent segment count.
* Rounds down.
*/
#define ConvertToXSegs(x, segsize) \
(x / ((segsize) / (1024 * 1024)))
((x) / ((segsize) / (1024 * 1024)))
/* The number of bytes in a WAL segment usable for WAL data. */
static int UsableBytesInSegment;