mm/khugepaged.c: fix khugepaged's request size in collapse_file
collapse_file() in khugepaged passes PAGE_SIZE as the number of pages to be read to page_cache_sync_readahead(). The intent was probably to read a single page. Fix it to use the number of pages to the end of the window instead. Fixes: 99cb0dbd ("mm,thp: add read-only THP support for (non-shmem) FS") Signed-off-by: NDavid Howells <dhowells@redhat.com> Signed-off-by: NMatthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Reviewed-by: NMatthew Wilcox (Oracle) <willy@infradead.org> Acked-by: NSong Liu <songliubraving@fb.com> Acked-by: NYang Shi <shy828301@gmail.com> Acked-by: NPankaj Gupta <pankaj.gupta.linux@gmail.com> Cc: Eric Biggers <ebiggers@google.com> Link: https://lkml.kernel.org/r/20200903140844.14194-2-willy@infradead.orgSigned-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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