linux-kernel - Re: [PATCH] regulator: pwm: Try to avoid voltage error in duty cycle calculation

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Message-ID: <20160402165311.GF2350@sirena.org.uk>
Date:	Sat, 2 Apr 2016 09:53:11 -0700
From:	Mark Brown <broonie@...nel.org>
To:	Laxman Dewangan <ldewangan@...dia.com>
Cc:	kbuild test robot <lkp@...el.com>, kbuild-all@...org,
	lgirdwood@...il.com, linux-kernel@...r.kernel.org,
	Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH] regulator: pwm: Try to avoid voltage error in duty cycle
 calculation

On Fri, Apr 01, 2016 at 12:02:19PM +0530, Laxman Dewangan wrote:
> On Friday 01 April 2016 11:55 AM, kbuild test robot wrote:

> >>>pwm-regulator.c:(.text+0x1728d4): undefined reference to `__umoddi3'
> >>>pwm-regulator.c:(.text+0x1728fd): undefined reference to `__udivdi3'

> Seems build error is coming from logic

> u64 req_period
> unsigned int diff;
> unsigned int period
> unsigned int req_diff

> req_period = req_diff * period;
> if (req_period % diff == 0)

> used u64 to avoid overflow in multiplication.

Yes, you're doing a 64 bit divide so that's kind of expected...  

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