linux-kernel - Re: [PATCH RFC 2/6] pwm: core: Add option to config PWM duty/period with u64 data length

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Message-ID: <20200725152442.GA11424@duo.ucw.cz>
Date:   Sat, 25 Jul 2020 17:24:42 +0200
From:   Pavel Machek <pavel@....cz>
To:     Martin Botka <martin.botka1@...il.com>
Cc:     Fenglin Wu <fenglinw@...eaurora.org>,
        Konrad Dybcio <konradybcio@...il.com>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Dan Murphy <dmurphy@...com>, Rob Herring <robh+dt@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Lee Jones <lee.jones@...aro.org>,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pwm@...r.kernel.org
Subject: Re: [PATCH RFC 2/6] pwm: core: Add option to config PWM duty/period
 with u64 data length

Hi!

> As can be seen this divides llu by llu in few warnings and error.
> At the time of sending i didn't realize it but this fails on 32 bit
> architectures.
> 
> So i would like to ask how would you like this fixed ?
> Using macro or some other way ?

+#include <linux/math64.h>
-               gain_q23 = (gain_q23 * dmic->boost_gain) / 100;
+               gain_q23 = div_u64(gain_q23 * dmic->boost_gain, 100);

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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