[PATCH v2] tty/serial: atmel: use offset_in_page() macro

[Geliang Tang]

Use offset_in_page() macro instead of open-coding.

Signed-off-by: Geliang Tang <geliangtang@xxxxxxxxx>
---
Changes in v2:
 - include mm.h
---
 drivers/tty/serial/atmel_serial.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index c355ac9..d25f044 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -46,6 +46,7 @@
 #include <linux/err.h>
 #include <linux/irq.h>
 #include <linux/suspend.h>
+#include <linux/mm.h>
 
 #include <asm/io.h>
 #include <asm/ioctls.h>
@@ -959,7 +960,7 @@ static int atmel_prepare_tx_dma(struct uart_port *port)
 	sg_set_page(&atmel_port->sg_tx,
 			virt_to_page(port->state->xmit.buf),
 			UART_XMIT_SIZE,
-			(unsigned long)port->state->xmit.buf & ~PAGE_MASK);
+			offset_in_page(port->state->xmit.buf));
 	nent = dma_map_sg(port->dev,
 				&atmel_port->sg_tx,
 				1,
@@ -1141,7 +1142,7 @@ static int atmel_prepare_rx_dma(struct uart_port *port)
 	sg_set_page(&atmel_port->sg_rx,
 		    virt_to_page(ring->buf),
 		    sizeof(struct atmel_uart_char) * ATMEL_SERIAL_RINGSIZE,
-		    (unsigned long)ring->buf & ~PAGE_MASK);
+		    offset_in_page(ring->buf));
 	nent = dma_map_sg(port->dev,
 			  &atmel_port->sg_rx,
 			  1,
-- 
2.9.3