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Subject: Re: [PATCH] tty/serial: atmel: use offset_in_page() macro
To: Geliang Tang <geliangtang@gmail.com>
References: <4dbc77ccaaed98b183cf4dba58a4fa325fd65048.1492758503.git.geliangtang@gmail.com>
 <5faae8a0740a804663c1066b23e2d5e7e9ebcbd3.1492758735.git.geliangtang@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jiri Slaby <jslaby@suse.com>, linux-serial@vger.kernel.org,
        linux-kernel@vger.kernel.org
From: Richard Genoud <richard.genoud@gmail.com>
Message-ID: <2c5f1602-c474-d3d3-01d3-03e7bc22f91f@gmail.com>
Date: Mon, 24 Apr 2017 09:12:44 +0200
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On 22/04/2017 03:21, Geliang Tang wrote:
> Use offset_in_page() macro instead of open-coding.
> 
> Signed-off-by: Geliang Tang <geliangtang@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,
> 
I guess you want to #include <linux/mm.h>
(even if it compiles ok without it)

Regards,
Richard.