context overflow

[Dan Malek]

I just heard about the bug Tom Gall fixed in "context_overflow"
by testing for current->mm == NULL.

I believe the proper solution is to use 'current->active_mm'
instead of 'current->mm' (and you never get a null pointer).
This way, the proper 'active' context is updated with a new
context even though a kernel thread has stolen it from somewhere
else to use.  I think skipping the selection of a new context
in this case could be logically incorrect for some PowerPC cores.


	-- Dan

--

	I like MMUs because I don't have a real life.

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