linux-kernel - [PATCH] xen/scsifront: use offset_in

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Date:   Sat, 22 Apr 2017 09:21:13 +0800
From:   Geliang Tang <geliangtang@...il.com>
To:     Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     Geliang Tang <geliangtang@...il.com>,
        xen-devel@...ts.xenproject.org, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] xen/scsifront: use offset_in_page() macro

Use offset_in_page() macro instead of open-coding.

Signed-off-by: Geliang Tang <geliangtang@...il.com>
---
 drivers/scsi/xen-scsifront.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/xen-scsifront.c b/drivers/scsi/xen-scsifront.c
index 9aa1fe1..a6a8b60 100644
--- a/drivers/scsi/xen-scsifront.c
+++ b/drivers/scsi/xen-scsifront.c
@@ -434,7 +434,7 @@ static int map_data_for_request(struct vscsifrnt_info *info,
 
 	if (seg_grants) {
 		page = virt_to_page(seg);
-		off = (unsigned long)seg & ~PAGE_MASK;
+		off = offset_in_page(seg);
 		len = sizeof(struct scsiif_request_segment) * data_grants;
 		while (len > 0) {
 			bytes = min_t(unsigned int, len, PAGE_SIZE - off);
-- 
2.9.3