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squashfs_fill_page is only used in this file, so make it static. Use kmap_local instead of kmap_atomic, and return a bool so that the caller can use folio_end_read() which saves an atomic operation over calling folio_mark_uptodate() followed by folio_unlock(). [willy@infradead.org: fix polarity of "uptodate" Thanks to Ryan for testing] Link: https://lkml.kernel.org/r/20250110163300.3346321-2-willy@infradead.org Link: https://lkml.kernel.org/r/20241220224634.723899-5-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Tested-by: Ryan Roberts <ryan.roberts@arm.com> Cc: Phillip Lougher <phillip@squashfs.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>