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 2dd33085b331da5bee79392dcf30f7e2c734f70b..adeb8d0f8aad38908af72794c2942a814c297ddd 100644 (file)
--- 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;