[patch 0/2] fix output from dump_stack/warn on multi-processor systems

[athorlton]

These patches fix up issues with interspersed output from multiple
simultaneous calls to warn or dump_stack on multi-cpu systems.

The first patch serializes the output from dump_stack.  The second 
adds the cpu/pid to the WARNING line, displayed by 
warn_slowpath_common so that it can be matched up with the 
appropriate stack trace.

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