More hw_breakpoint scariness reduction

From: Andy Lutomirski
Date: Fri Aug 14 2015 - 18:38:57 EST

Would you all consider it acceptable to disallow watchpoints on per
cpu data entirely? I can think of a *lot* of places where hitting #DB
when accessing per cpu data from entry asm would be bad.

Of course, actually implementing that might be less than entirely fun,
given that a cpu could be onlined after creating a watchpoint.


Andy Lutomirski
AMA Capital Management, LLC
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