[PATCH] ARM: add warning for invalid kernel page faults
Imre Deak
imre.deak at nokia.com
Mon Sep 28 06:00:48 EDT 2009
On Mon, Sep 28, 2009 at 11:55:16AM +0200, ext Russell King - ARM Linux wrote:
> On Mon, Sep 28, 2009 at 12:48:24PM +0300, Imre Deak wrote:
> > To easier detect code that can trigger the above error, add a check
> > also for the case where mmap_sem is acquired. As this has an overhead
> > make it a VM debug warning.
>
> It _is_ already easy. I'm not sure why you want even more noise, and
> why you want to break the page fault handling. From the warning you
> received in your previous post, it said:
The problem is that it happens very rarely. Only if at the time of the
fault the mmap_sem happens to be held. With the change the error would
be apparent at the first fault the offending instruction generates.
For debugging this is very useful, I think.
--Imre
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