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

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Message-ID: <Pine.LNX.4.64.0706191624110.15951@schroedinger.engr.sgi.com>
Date:	Tue, 19 Jun 2007 16:25:57 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>
cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	ak@...e.de, gregkh@...e.de, muli@...ibm.com,
	suresh.b.siddha@...el.com, arjan@...ux.intel.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, Keshavamurthy, Anil S wrote:


> So far in our test scenario, we were unable to create
> any memory allocation failure inside dma map api calls.

All these functions should have gfp_t flags passed to them.
Otherwise you are locked into the use of GFP_ATOMIC. If this is a 
parameter then you may be able to use GFP_KERNEL in various places and you 
may develop the code to have less GFP_ATOMIC allocs in the future.

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