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Convert function to use folios throughout. This is in preparation for the
removal of find_get_pages_range_tag(). This change removes 5 calls to
compound_head().
Initially the function was checking if the previous page index is truly
the previous page i.e. 1 index behind the current page. To convert to
folios and maintain this check we need to make the check folio->index !=
prev + folio_nr_pages(previous folio) since we don't know how many pages
are in a folio.
At index i == 0 the check is guaranteed to succeed, so to workaround
indexing bounds we can simply ignore the check for that specific index.
This makes the initial assignment of prev trivial, so I removed that as
well.
Also modify a comment in commit_checkpoint for consistency.
Link: https://lkml.kernel.org/r/20230104211448.4804-17-vishal.moola@gmail.com
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Acked-by: Chao Yu <chao@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
580e7a4926