linux-kernel - Re: [Intel IOMMU 06/10] Avoid memory allocation failures in dma map api calls

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Message-ID: <Pine.LNX.4.64.0706191632380.15951@schroedinger.engr.sgi.com>
Date:	Tue, 19 Jun 2007 16:34:24 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Arjan van de Ven <arjan@...ux.intel.com>
cc:	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	ak@...e.de, gregkh@...e.de, muli@...ibm.com,
	suresh.b.siddha@...el.com, ashok.raj@...el.com, davem@...emloft.net
Subject: Re: [Intel IOMMU 06/10] Avoid memory allocation failures in dma map
 api calls

On Tue, 19 Jun 2007, Arjan van de Ven wrote:

> > Otherwise you are locked into the use of GFP_ATOMIC.
> 
> all callers pretty much are either in irq context or with spinlocks held. Good
> luck..... it's also called primarily from the PCI DMA API which doesn't take a
> gfp_t argument in the first place...
> 
> so I'm not seeing the point.

Hmmm... From my superficial look at things it seems that one could avoid 
GFP_ATOMIC at times. I do not know too much about the driver though but it 
seems a bit restrictive to always do GFP_ATOMIC allocs.

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