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

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Message-ID: <20081028103902.GB22319@elte.hu>
Date:	Tue, 28 Oct 2008 11:39:02 +0100
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 12:15:57 +0200,
> Ingo Molnar wrote:
> > 
> > 
> > * 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, what is the status about these patches?
> They don't appear in rc2.

Will send it today-ish. -rc2 was strictly for brown paperbag bugs 
crashing more than half of all testsystems.

	Ingo
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