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Save a few calls to compound_head by converting the passed page to
a folio.  Reduces kernel text size by 74 bytes.

Link: https://lkml.kernel.org/r/20220617175020.717127-13-willy@infradead.org

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>