From: David Howells <dhowells@xxxxxxxxxx> Subject: 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. Link: https://lkml.kernel.org/r/20200903140844.14194-2-willy@xxxxxxxxxxxxx Fixes: 99cb0dbd47a1 ("mm,thp: add read-only THP support for (non-shmem) FS") Signed-off-by: David Howells <dhowells@xxxxxxxxxx> Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> Acked-by: Song Liu <songliubraving@xxxxxx> Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> Acked-by: Yang Shi <shy828301@xxxxxxxxx> Acked-by: Pankaj Gupta <pankaj.gupta.linux@xxxxxxxxx> Cc: Eric Biggers <ebiggers@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/khugepaged.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/khugepaged.c~fix-khugepageds-request-size-in-collapse_file +++ a/mm/khugepaged.c @@ -1709,7 +1709,7 @@ static void collapse_file(struct mm_stru xas_unlock_irq(&xas); page_cache_sync_readahead(mapping, &file->f_ra, file, index, - PAGE_SIZE); + end - index); /* drain pagevecs to help isolate_lru_page() */ lru_add_drain(); page = find_lock_page(mapping, index); _
