linux-kernel - [PATCH] tty/serial: atmel: use offset_in

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Message-Id: <5faae8a0740a804663c1066b23e2d5e7e9ebcbd3.1492758735.git.geliangtang@gmail.com>
Date:   Sat, 22 Apr 2017 09:21:12 +0800
From:   Geliang Tang <geliangtang@...il.com>
To:     Richard Genoud <richard.genoud@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>
Cc:     Geliang Tang <geliangtang@...il.com>, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] tty/serial: atmel: use offset_in_page() macro

Use offset_in_page() macro instead of open-coding.

Signed-off-by: Geliang Tang <geliangtang@...il.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