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Let's make it clearer that we are operating within a single folio by providing both the folio and the page. This implies that for flush_dcache_folio() we'll now avoid one more page->folio lookup, and that we can safely drop the "nth_page" usage. While at it, drop the "extern" from the function declaration. Link: https://lkml.kernel.org/r/20250901150359.867252-22-david@redhat.com Signed-off-by: David Hildenbrand <david@redhat.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>