8.0-RC1 panic attaching ppc

Daniel O'Connor doconnor at gsoft.com.au
Mon Sep 28 02:04:17 UTC 2009

On Sun, 27 Sep 2009, Alan Cox wrote:
> Ok, now I can explain what is happening.  The kernel is using 1GB
> pages to implement the direct map.  Unfortunately, pmap_extract()
> doesn't know how to handle a 1GB page mapping.  pmap_kextract() only
> works by an "accident" of its different implementation.  In other
> words, it should not be relied upon to work either.
> Please revert whatever patch John gave you and try the attached
> patch. It simply disables the use of 1GB page mapping by the direct
> map.

Your patch fixes (works around?) the problem.


Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
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