linux-kernel - Re: PROBLEM: ARM-dma-mapping-fix-for-speculative-prefetching cause OOPS

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Date:	Thu, 7 Jul 2011 10:39:28 +0100
From:	Russell King <rmk@....linux.org.uk>
To:	Qin Dehua <qindehua@...il.com>
Cc:	Dan Williams <dan.j.williams@...el.com>,
	linux-kernel@...r.kernel.org, santosh.shilimkar@...com,
	neilb@...e.de
Subject: Re: PROBLEM: ARM-dma-mapping-fix-for-speculative-prefetching cause
	OOPS

On Fri, Jul 01, 2011 at 12:54:09PM +0800, Qin Dehua wrote:
> The followings are messages of the three tests:
> ====== RUN 1 ======
> kernel BUG at drivers/md/raid5.c:3978!

So they are BUG_ON()s after all...

Could you try commenting out:

+       if (dir != DMA_TO_DEVICE)
+               outer_inv_range(paddr, paddr + size);

in ___dma_page_dev_to_cpu and:

+       if (dir != DMA_TO_DEVICE) {
+               unsigned long paddr = __pa(kaddr);
+               outer_inv_range(paddr, paddr + size);
+       }

in ___dma_single_dev_to_cpu please - and put a BUG_ON(dir == DMA_BIDIRECTIONAL)
in their place (because that won't be handled correctly with that change.)

Thanks.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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