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Add isolate_lru_page() as a wrapper around isolate_lru_folio(). TestClearPageLRU() would have always failed on a tail page, so returning -EBUSY is the same behaviour. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: John Hubbard <jhubbard@nvidia.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Reviewed-by: William Kucharski <william.kucharski@oracle.com>