linux-kernel - Re: swiotlb_alloc_coherent: allocated memory is out of range for device

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Message-ID: <20081023101557.GA30302@elte.hu>
Date:	Thu, 23 Oct 2008 12:15:57 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	svens@...ckframe.org, joerg.roedel@....com,
	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: swiotlb_alloc_coherent: allocated memory is out of range for
	device


* Takashi Iwai <tiwai@...e.de> wrote:

> At Thu, 23 Oct 2008 07:22:09 +0200,
> I wrote:
> > 
> > > The current dma_alloc_coherent (asm-x86/dma-mapping.h) handles the gfp
> > > flags in the exact same way as the old dma_alloc_coherent
> > > (pci-dma.c). Neither sets GFP_DMA even if coherent_dma_mask is
> > > 24bits. The old code is fine because of the GFP_DMA retry
> > > mechanism. But if coherent_dma_mask is 24bits, there is no point to go
> > > into the GFP_DMA retry mechanism. We should use GFP_DMA in the first
> > > place.
> > > 
> > > How about the following patch?
> > 
> > I'll give it a try later (the machine is in my office).
> 
> The patch seems working fine.  Thanks!
> 
> Tested-by: Takashi Iwai <tiwai@...e.de>

thanks guys - i've queued it up in tip/core/urgent and will send a pull 
request to Linus later today.

	Ingo
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