perfcounters: enable lowlevel pmc code to schedule counters
authorIngo Molnar <mingo@elte.hu>
Sun, 21 Dec 2008 12:50:42 +0000 (13:50 +0100)
committerIngo Molnar <mingo@elte.hu>
Tue, 23 Dec 2008 11:45:19 +0000 (12:45 +0100)
Allow lowlevel ->enable() op to return an error if a counter can not be
added. This can be used to handle counter constraints.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

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