linux-kernel - Re: [PATCH V3] pwm: Use div64_ul instead of do

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Date:   Thu, 18 Nov 2021 10:54:18 +0100
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     cgel.zte@...il.com
Cc:     alexandre.belloni@...tlin.com, deng.changcheng@....com.cn,
        lee.jones@...aro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-pwm@...r.kernel.org,
        ludovic.desroches@...rochip.com, nicolas.ferre@...rochip.com,
        thierry.reding@...il.com, zealci@....com.cn
Subject: Re: [PATCH V3] pwm: Use div64_ul instead of do_div

On Thu, Nov 18, 2021 at 02:52:54AM +0000, cgel.zte@...il.com wrote:
> From: Changcheng Deng <deng.changcheng@....com.cn>
> 
> do_div() does a 64-by-32 division. Here the divisor is an unsigned long
> which on some platforms is 64 bit wide. So use div64_ul instead of do_div
> to avoid a possible truncation.
> 
> Reported-by: Zeal Robot <zealci@....com.cn>
> Signed-off-by: Changcheng Deng <deng.changcheng@....com.cn>

There is no S-o-b line matching the mail sender.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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