linux-kernel - Re: [alsa-devel] [PATCH 1/3] ASoC: mediatek: Add AFE platform driver

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Date:	Fri, 12 Jun 2015 16:24:48 +0800
From:	Koro Chen <koro.chen@...iatek.com>
To:	Paul Bolle <pebolle@...cali.nl>
CC:	<devicetree@...r.kernel.org>, <alsa-devel@...a-project.org>,
	<srv_heupstream@...iatek.com>, <tiwai@...e.de>,
	<linux-kernel@...r.kernel.org>, <s.hauer@...gutronix.de>,
	<lgirdwood@...il.com>, <robh+dt@...nel.org>, <broonie@...nel.org>,
	<linux-mediatek@...ts.infradead.org>, <galak@...eaurora.org>,
	<matthias.bgg@...il.com>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [alsa-devel] [PATCH 1/3] ASoC: mediatek: Add AFE platform driver

On Fri, 2015-06-12 at 09:37 +0200, Paul Bolle wrote:
> On Fri, 2015-06-12 at 09:55 +0800, Koro Chen wrote:
> > On Thu, 2015-06-11 at 09:03 +0200, Paul Bolle wrote:
> > > (What does negating a bool twice do?)
> > > 
> > Because bool actually can be unsigned char, although actually in this
> > driver, the caller always passes "true" or "false" to this function.
> 
> bool is _Bool in the kernel (see include/linux/types.h). So whenever you
> see a bool in the kernel you can assume it's either 0 or 1. Are there
> any cases where this conveniently simple rule doesn't hold?
> 
> But here the discussion is moot, because as you say, the function will
> only be passed false or true so we know "enable" is either 0 or 1 and
> double negating will do nothing.
> 
> > Do you think if this is the case, should I still need to do !!?
> 
> So you should not, as it's confusing at best.
> 
OK, thank you. I will drop it in the next version of patch.
> Thanks,
> 
> 
> Paul Bolle
> 


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