linux-kernel - Re: 2.6.22-rc6 bad page error

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Message-Id: <20070709185324.387ACDBA1@gherkin.frus.com>
Date:	Mon, 9 Jul 2007 13:53:24 -0500 (CDT)
From:	rct@...rkin.frus.com (Bob Tracy)
To:	Hugh Dickins <hugh@...itas.com>
CC:	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	linux-kernel@...r.kernel.org, linux-alpha@...r.kernel.org
Subject: Re: 2.6.22-rc6 bad page error

Hugh Dickins wrote:
> (...) I'm expecting this to be a regression we introduced in
> 2.6.15, rather than recently in 2.6.22 (now, that's better isn't it ;-?)
> (...)
> I think sound/isa/es18xx.c's
> 	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
> will take it to sound/core/memalloc.c's
> 	res = dma_alloc_coherent(dev, PAGE_SIZE << pg, dma, gfp_flags);
> where we've carefully included __GFP_COMP in gfp_flags to avoid this
> kind of problem (replacing the pre-2.6.15 use of PageReserved).
> (...)
> Blame me or Nick for removing the
> special PageReserved usage, or Alpha for ignoring our gfp_flags:
> 
>   #define dma_alloc_coherent(dev, size, addr, gfp)	\
> 		pci_alloc_consistent(alpha_gendev_to_pci(dev), size, addr)
> 
> When you get a chance, please would you try patch below?
> 
> --- 2.6.22-rc7/arch/alpha/kernel/pci_iommu.c	2007-06-05 06:19:19.000000000 +0100
> +++ linux/arch/alpha/kernel/pci_iommu.c	2007-07-07 15:00:04.000000000 +0100

That seems to have done the trick.  Normally, I get the "bad page"
errors on the second NX session, but I'm on the third session of the
day (thus far), and everything seems to be ok as far as I can tell.

-- 
-----------------------------------------------------------------------
Bob Tracy               | "Eagles may soar, but weasels don't get
rct@...s.com            |  sucked into jet engines."       --Anon
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