linux-kernel - [PATCH] bio: use offset_in

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Date:	Sat, 21 Nov 2015 17:27:31 +0800
From:	Geliang Tang <geliangtang@....com>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	Geliang Tang <geliangtang@....com>, linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] bio: use offset_in_page macro

Use offset_in_page macro instead of (addr & ~PAGE_MASK).

Signed-off-by: Geliang Tang <geliangtang@....com>
---
 block/bio.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/bio.c b/block/bio.c
index 4f184d9..dbabd48 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1125,7 +1125,7 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
 	int i, ret;
 	int nr_pages = 0;
 	unsigned int len = iter->count;
-	unsigned int offset = map_data ? map_data->offset & ~PAGE_MASK : 0;
+	unsigned int offset = map_data ? offset_in_page(map_data->offset) : 0;
 
 	for (i = 0; i < iter->nr_segs; i++) {
 		unsigned long uaddr;
@@ -1304,7 +1304,7 @@ struct bio *bio_map_user_iov(struct request_queue *q,
 			goto out_unmap;
 		}
 
-		offset = uaddr & ~PAGE_MASK;
+		offset = offset_in_page(uaddr);
 		for (j = cur_page; j < page_limit; j++) {
 			unsigned int bytes = PAGE_SIZE - offset;
 
-- 
2.5.0


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