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

[Geliang Tang]

Use offset_in_page() macro instead of open-coding.

Signed-off-by: Geliang Tang <geliangt...@gmail.com>
---
 drivers/tty/serial/atmel_serial.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/atmel_serial.c 
b/drivers/tty/serial/atmel_serial.c
index c355ac9..f398db8 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -959,7 +959,7 @@ 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 +1141,7 @@ 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