cpus_in_xmon questions

Hollis Blanchard hollisb at us.ibm.com
Thu Aug 28 02:40:40 EST 2003

On Tuesday, Aug 26, 2003, at 19:27 US/Central, Anton Blanchard wrote:
>> Also, what is cpus_in_xmon used for? In xmon/xmon.c, it looks like
>> it's
>> used to prevent a CPU from recursively entering xmon. What could cause
>> that, and would an oops or some sort of message be better there? What
>> prevents a UP CPU from doing the same thing?
> That area of code should probably be looked over. Entering xmon
> recursively is bad stuff but we should not lock up silently.

You've seen it happen? How?

And could it happen on UP? AFAICS only SMP is guarded against the

Hollis Blanchard
IBM Linux Technology Center

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