From c809579374f47c8273eaf22a40674ae547f39254 Mon Sep 17 00:00:00 2001
From: Chi Zhiling <chizhiling@kylinos.cn>
Date: Thu, 10 Jul 2025 14:04:51 +0800
Subject: [PATCH] readahead: use folio_nr_pages() instead of shift operation

folio_nr_pages() is faster helper function to get the number of pages when
NR_PAGES_IN_LARGE_FOLIO is enabled.

Link: https://lkml.kernel.org/r/20250710060451.3535957-1-chizhiling@163.com
Signed-off-by: Chi Zhiling <chizhiling@kylinos.cn>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 mm/readahead.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/readahead.c b/mm/readahead.c
index 95a24f12d1e7f..406756d343092 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -649,7 +649,7 @@ void page_cache_async_ra(struct readahead_control *ractl,
 	 * Ramp up sizes, and push forward the readahead window.
 	 */
 	expected = round_down(ra->start + ra->size - ra->async_size,
-			1UL << folio_order(folio));
+			folio_nr_pages(folio));
 	if (index == expected) {
 		ra->start += ra->size;
 		/*
-- 
2.47.2