linux-kernel - Re: [PATCH v2 3/3] tty: serial: samsung_tty: Use abs() to simplify some code

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Message-ID: <69054d03-39e5-8c42-a9a9-8934ab4bf6c9@kernel.org>
Date:   Mon, 12 Jun 2023 07:13:06 +0200
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Walter Harms <wharms@....de>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH v2 3/3] tty: serial: samsung_tty: Use abs() to simplify
 some code

On 10. 06. 23, 17:59, Christophe JAILLET wrote:
> Use abs() instead of hand-writing it.
> 
> Suggested-by: Walter Harms <wharms@....de>
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> v2: new patch
> ---
>   drivers/tty/serial/samsung_tty.c | 5 ++---
>   1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
> index 0b37019820b4..b29e9dfd81a6 100644
> --- a/drivers/tty/serial/samsung_tty.c
> +++ b/drivers/tty/serial/samsung_tty.c
> @@ -24,6 +24,7 @@
>   #include <linux/dmaengine.h>
>   #include <linux/dma-mapping.h>
>   #include <linux/slab.h>
> +#include <linux/math.h>
>   #include <linux/module.h>
>   #include <linux/ioport.h>
>   #include <linux/io.h>
> @@ -1485,9 +1486,7 @@ static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport,
>   		}
>   		quot--;
>   
> -		calc_deviation = req_baud - baud;
> -		if (calc_deviation < 0)
> -			calc_deviation = -calc_deviation;
> +		calc_deviation = abs(req_baud - baud);

Does this work provided req_baud and baud are unsigned?

thanks,
-- 
js
suse labs