At Mon, 10 Oct 2022 08:53:55 +0530, Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com> wrote in > It looks like we have an unnecessary XLogSegNoOffsetToRecPtr() in > XLogReaderValidatePageHeader(). We pass the start LSN of the WAL page > and check if it matches with the LSN that was stored in the WAL page > header (xlp_pageaddr). We find segno, offset and LSN again using > XLogSegNoOffsetToRecPtr(). This happens to be the same as the passed > in LSN 'recptr'.
Yeah, that's obviously useless. It looks like a thinko in pg93 when recptr became to be directly passed from the caller instead of calculating from static variables for file, segment and in-segment offset.
+1. This should be introduced in 7fcbf6a4 as a thinko. A grep search shows other callers of XLogSegNoOffsetToRecPtr have no such issue.
