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Invert the atomic_inc_not_zero() test so that we will indeed detect the
first activation.
Also rename the global num_counters, since its easy to confuse with
x86_pmu.num_counters.
[ Impact: fix non-working perfcounters on AMD CPUs, cleanup ]
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1241455664.7620.4938.camel@twins>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
ba77813a2a