linux-kernel - [PATCH] readahead: Use folio_nr_pages() instead of shift operation

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Message-ID: <20250710060451.3535957-1-chizhiling@163.com>
Date: Thu, 10 Jul 2025 14:04:51 +0800
From: Chi Zhiling <chizhiling@....com>
To: willy@...radead.org,
	akpm@...ux-foundation.org
Cc: linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Chi Zhiling <chizhiling@...inos.cn>
Subject: [PATCH] readahead: Use folio_nr_pages() instead of shift operation

From: Chi Zhiling <chizhiling@...inos.cn>

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

Signed-off-by: Chi Zhiling <chizhiling@...inos.cn>
---
 mm/readahead.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/readahead.c b/mm/readahead.c
index 95a24f12d1e7..406756d34309 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;
 		/*
-- 
2.43.0