On Fri, 2007-02-16 at 02:19 -0800, Zachary Amsden wrote:

Doesn't stop_machine_run already take care of getting you out of all 
kernel threads?  So you can only be sleeping, not preempted, in which 
case, this might not be an issue?

No, stop_machine only protects against preempt-disabled regions.

I thought about making that particularly hammer bigger, but noone had
needed it yet.  It would simply require a runtime way of disabling
further preemption and flushing preempted threads (AFAICT there can be
no deadlock issues with this).

Rusty.