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readahead: use folio_nr_pages() instead of shift operation

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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>
This commit is contained in:
Chi Zhiling 2025-07-10 14:04:51 +08:00 committed by Andrew Morton
parent 188cb385bb
commit c809579374
1 changed files with 1 additions and 1 deletions
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2
mm/readahead.c
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@ -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;
/*