linux-kernel - Re: [PATCH v2] dma: mmp_pdma: fix a memory alloc error

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Date:	Mon, 29 Jul 2013 10:59:30 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Xiang Wang <wangxfdu@...il.com>
Cc:	Dan Williams <djbw@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	cxie4@...vell.com, Xiang Wang <wangx@...vell.com>
Subject: Re: [PATCH v2] dma: mmp_pdma: fix a memory alloc error

On Thu, Jul 25, 2013 at 10:22:50AM +0800, Xiang Wang wrote:

Btw its generally a good idea to remove the parts not required for further
discussion

> Would you please explain a little more about why we should use
> GFP_NOWAIT here? This memory is not dedicated for DMA controller. Do
> we have special reasons to use GFP_NOWAIT? Thanks!
There are few reasons
- the dma requests can be triggered from atomic context
- so for above you can argue to use the GFP_ATOMIC and the guideline for dma
  drivers [1] was discussed briefly

~Vinod
[1]: http://lkml.indiana.edu/hypermail/linux/kernel/0911.1/02316.html

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