From 0aa4fc32f54028f6fbb35bf71df4b0d86ff1662b Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri, 10 Jun 2022 20:30:35 -0400
Subject: [PATCH] ITER_XARRAY: don't open-code DIV_ROUND_UP()

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 lib/iov_iter.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 8c6cdc1cf832..c78129e709f2 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -1386,15 +1386,7 @@ static ssize_t iter_xarray_get_pages(struct iov_iter *i,
 	offset = pos & ~PAGE_MASK;
 	*_start_offset = offset;
 
-	count = 1;
-	if (size > PAGE_SIZE - offset) {
-		size -= PAGE_SIZE - offset;
-		count += size >> PAGE_SHIFT;
-		size &= ~PAGE_MASK;
-		if (size)
-			count++;
-	}
-
+	count = DIV_ROUND_UP(size + offset, PAGE_SIZE);
 	if (count > maxpages)
 		count = maxpages;