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

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Date:	Wed, 15 Jul 2015 10:29:55 +0000
From:	Yao Yuan <yao.yuan@...escale.com>
To:	Arnd Bergmann <arnd@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
CC:	"vinod.koul@...el.com" <vinod.koul@...el.com>,
	"stefan@...er.ch" <stefan@...er.ch>,
	"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>
Subject: RE: [PATCH] dmaengine: fsl-edma: add PM suspend/resume support

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.

Thanks.

Best Regards,
Yuan Yao

> -----Original Message-----
> From: Arnd Bergmann [mailto:arnd@...db.de]
> Sent: Wednesday, July 15, 2015 5:57 PM
> To: linux-arm-kernel@...ts.infradead.org
> Cc: Yuan Yao-B46683; vinod.koul@...el.com; stefan@...er.ch;
> dmaengine@...r.kernel.org; dan.j.williams@...el.com; linux-
> kernel@...r.kernel.org
> Subject: Re: [PATCH] dmaengine: fsl-edma: add PM suspend/resume support
> 
> On Wednesday 15 July 2015 17:32:58 Yuan Yao wrote:
> > +#ifdef CONFIG_PM
> > +enum fsl_edma_pm_state {
> > +       RUNNING = 0,
> > +       SUSPENDED,
> > +};
> > +#endif
> >
> >  struct fsl_edma_hw_tcd {
> >
> 
> The #ifdefs here seem unnecessary, at least most of them, better just do this
> all unconditionally.
> 
> 	Arnd
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