On Wed, Nov 30, 2005 at 08:03:33PM -0800, Zwane Mwaikambo wrote:
> NULL dereferences don't cause a page fault if the 4th level pagetable
> being used is init_level4_pgt because we never zap_low_mappings. Since
> the idle thread uses init_level4_pgt any bad dereferences happening there
> (e.g. from interrupts) won't cause a fault. Andi would you be fine with
> switching the idle threads to a different level4?
That recently changed. Are you sure it's still the case?
idle threads should always run with lazy TLB, no different mms.
That's important for performance.
If a NULL reference causes a oops or not depends on if user space
from the last process mapped a page to NULL or not.
-Andi
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