linux-kernel - Re: [PATCH] dmaengine: fsl-edma: add PM suspend/resume support

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Message-ID: <2042080.Y9rzRSQLpW@wuerfel>
Date:	Wed, 15 Jul 2015 16:54:33 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Yao Yuan <yao.yuan@...escale.com>,
	"vinod.koul@...el.com" <vinod.koul@...el.com>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
	"dan.j.williams@...el.com" <dan.j.williams@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stefan@...er.ch" <stefan@...er.ch>
Subject: Re: [PATCH] dmaengine: fsl-edma: add PM suspend/resume support

On Wednesday 15 July 2015 10:29:55 Yao Yuan wrote:
> Hi Arnd,
> 
> Thanks for your review.
> And can you give me more information?
> In my opinion, The fsl_edma_pm_state will just be used when CONFIG_PM support. So why not use the #ifdefs to remove the 
> unnecessary code? Since the PM will not be selected in many use cases.

I would consider code readability more important than saving a
few instructions, and the #ifdef interrupts the reading flow.
Another aspect is that the compiler does not produce warnings
for incorrect code in an #ifdef, so we try to use e.g. 'if (IS_ENABLED(CONFIG_FOO))'
instead of '#ifdef CONFIG_FOO' wherever possible.

	Arnd
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