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

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Date:	Thu, 30 Jun 2011 12:28:04 +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 07:16:24PM +0800, Qin Dehua wrote:
> Commit 2ffe2da3e follows v2.6.32, the message is from kernel build on
> commit 2ffe2da3e.
> 
> The config has CONFIG_BUG=y and CONFIG_DEBUG_BUGVERBOSE=y, but the
> message is Oops, not BUG() macro, so they don't have line number.

In that case, the raid5 code contains an explicit NULL pointer
dereference which isn't a BUG() - the code line disassembles to:

   0:   ebfff1bc        bl      0xffffc6f8
   4:   e28dd044        add     sp, sp, #68     ; 0x44
   8:   e8bd8ff0        pop     {r4, r5, r6, r7, r8, r9, sl, fp, pc}
   c:   e3a03000        mov     r3, #0  ; 0x0
  10:   e5833000        str     r3, [r3] <=== faulting instruction

So, if you're saying that's not a BUG(), then I don't know what it is
and I'm afraid I can't help because the oops doesn't make any sense
to me.

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