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Add parens to ConvertToXSegs macro

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The current definition (introduced in 9a3215026bd6) is dangerous.  No
bugs exist in our code at present, but backpatch to 11 nonetheless,
where that commit debuted.

Author: Álvaro Herrera <alvherre@alvh.no-ip.org>
This commit is contained in:
Alvaro Herrera 2020-06-24 13:57:21 -04:00
parent 35a8e227e6
commit 5c215c941c
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GPG Key ID: 1C20ACB9D5C564AE
1 changed files with 5 additions and 2 deletions
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7
src/backend/access/transam/xlog.c
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@ -738,9 +738,12 @@ static ControlFileData *ControlFile = NULL;
*/ */
#define UsableBytesInPage (XLOG_BLCKSZ - SizeOfXLogShortPHD) #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) \ #define ConvertToXSegs(x, segsize) \
(x / ((segsize) / (1024 * 1024))) ((x) / ((segsize) / (1024 * 1024)))
/* The number of bytes in a WAL segment usable for WAL data. */ /* The number of bytes in a WAL segment usable for WAL data. */
static int UsableBytesInSegment; static int UsableBytesInSegment;