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:

quoted

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