SLRU_SEGMENTS_PER_PAGE -> SLRU_PAGES_PER_SEGMENT
I introduced this ancient typo in subtrans.c and later propagated it to
multixact.c. I fixed the latter in
f741300c, but only back to 9.3;
backpatch to all supported branches for consistency.
* Note: because both MultiXactOffsets and TransactionIds are 32 bits and
* wrap around at 0xFFFFFFFF, MultiXact page numbering also wraps around at
* 0xFFFFFFFF/MULTIXACT_*_PER_PAGE, and segment numbering at
- * 0xFFFFFFFF/MULTIXACT_*_PER_PAGE/SLRU_SEGMENTS_PER_PAGE. We need take no
+ * 0xFFFFFFFF/MULTIXACT_*_PER_PAGE/SLRU_PAGES_PER_SEGMENT. We need take no
* explicit notice of that fact in this module, except when comparing segment
* and page numbers in TruncateMultiXact
* (see MultiXact{Offset,Member}PagePrecedes).
* Note: because TransactionIds are 32 bits and wrap around at 0xFFFFFFFF,
* SubTrans page numbering also wraps around at
* 0xFFFFFFFF/SUBTRANS_XACTS_PER_PAGE, and segment numbering at
- * 0xFFFFFFFF/SUBTRANS_XACTS_PER_PAGE/SLRU_SEGMENTS_PER_PAGE. We need take no
+ * 0xFFFFFFFF/SUBTRANS_XACTS_PER_PAGE/SLRU_PAGES_PER_SEGMENT. We need take no
* explicit notice of that fact in this module, except when comparing segment
* and page numbers in TruncateSUBTRANS (see SubTransPagePrecedes).
*/