linux-kernel - [PATCH] dm-crypt: use folio_nr_pages() instead of shift operation

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Message-Id: <20251004031912.50662-1-pedrodemargomes@gmail.com>
Date: Sat,  4 Oct 2025 00:19:12 -0300
From: Pedro Demarchi Gomes <pedrodemargomes@...il.com>
To: Alasdair Kergon <agk@...hat.com>,
	Mike Snitzer <snitzer@...nel.org>,
	Mikulas Patocka <mpatocka@...hat.com>
Cc: dm-devel@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Pedro Demarchi Gomes <pedrodemargomes@...il.com>
Subject: [PATCH] dm-crypt: use folio_nr_pages() instead of shift operation

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

Signed-off-by: Pedro Demarchi Gomes <pedrodemargomes@...il.com>
---
 drivers/md/dm-crypt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 5ef43231fe77..a1025bb29ebd 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -1781,7 +1781,7 @@ static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone)
 		bio_for_each_folio_all(fi, clone) {
 			if (folio_test_large(fi.folio)) {
 				percpu_counter_sub(&cc->n_allocated_pages,
-						1 << folio_order(fi.folio));
+						folio_nr_pages(fi.folio));
 				folio_put(fi.folio);
 			} else {
 				mempool_free(&fi.folio->page, &cc->page_pool);
-- 
2.39.5