linux-kernel - [PATCH v1 29/36] scsi: scsi_lib: drop nth

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Message-ID: <20250827220141.262669-30-david@redhat.com>
Date: Thu, 28 Aug 2025 00:01:33 +0200
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: David Hildenbrand <david@...hat.com>,
	Bart Van Assche <bvanassche@....org>,
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Subject: [PATCH v1 29/36] scsi: scsi_lib: drop nth_page() usage within SG entry

It's no longer required to use nth_page() when iterating pages within a
single SG entry, so let's drop the nth_page() usage.

Reviewed-by: Bart Van Assche <bvanassche@....org>
Cc: "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>
Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
Signed-off-by: David Hildenbrand <david@...hat.com>
---
 drivers/scsi/scsi_lib.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 0c65ecfedfbd6..d7e42293b8645 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -3148,8 +3148,7 @@ void *scsi_kmap_atomic_sg(struct scatterlist *sgl, int sg_count,
 	/* Offset starting from the beginning of first page in this sg-entry */
 	*offset = *offset - len_complete + sg->offset;
 
-	/* Assumption: contiguous pages can be accessed as "page + i" */
-	page = nth_page(sg_page(sg), (*offset >> PAGE_SHIFT));
+	page = sg_page(sg) + (*offset >> PAGE_SHIFT);
 	*offset &= ~PAGE_MASK;
 
 	/* Bytes in this sg-entry from *offset to the end of the page */
-- 
2.50.1