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

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Date:	Thu, 30 Jun 2011 08:43:01 +0100
From:	Russell King <rmk@....linux.org.uk>
To:	Qin Dehua <qindehua@...il.com>
Cc:	linux-kernel@...r.kernel.org, santosh.shilimkar@...com,
	dan.j.williams@...el.com, neilb@...e.de
Subject: Re: PROBLEM: ARM-dma-mapping-fix-for-speculative-prefetching cause
	OOPS

On Thu, Jun 30, 2011 at 12:09:15PM +0800, Qin Dehua wrote:
> The 2.6.38.8 Kernel make our IOP 341 XScale processor based RAID6 crashes.
> 
> After doing a bisection, We found commit
> 2ffe2da3e71652d4f4cae19539b5c78c2a239136 cause the problem.
> 
> That commit is only for ARMv6 and ARMv7 CPUs, so we revert it on
> 2.6.38.8 Kernel, and then our raid box runs OK.
> 
> Following are some kernel messages when the system crashes:
> 
> 	* The kernel config has CONFIG_ASYNC_PQ=y CONFIG_RAID6_PQ=y

These traces are from 2.6.32... And I assume have CONFIG_BUG unset
because you have no verbose bug reporting (it's not reporting the
file/line which is necessary to identify which BUG has been hit in
the raid code.)

Could you reproduce with CONFIG_BUG=y please?

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