From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 2 Jan 2016 17:45:27 +0000 (-0500)
Subject: dm-bufio: virt_to_phys() doesn't change remainder modulo PAGE_SIZE
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=756d097b959aefe69a081496f84cfc14b1397a15;p=linux-beck.git

dm-bufio: virt_to_phys() doesn't change remainder modulo PAGE_SIZE

... so virt_to_phys(p) & (PAGE_SIZE - 1) is a very odd way to
spell offset_in_page(p).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index 2dd33085b331..adeb8d0f8aad 100644
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -630,7 +630,7 @@ static void use_inline_bio(struct dm_buffer *b, int rw, sector_t block,
 	do {
 		if (!bio_add_page(&b->bio, virt_to_page(ptr),
 				  len < PAGE_SIZE ? len : PAGE_SIZE,
-				  virt_to_phys(ptr) & (PAGE_SIZE - 1))) {
+				  offset_in_page(ptr))) {
 			BUG_ON(b->c->block_size <= PAGE_SIZE);
 			use_dmio(b, rw, block, end_io);
 			return;