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Current perf init will failed with: [ 1.452433] csky-pmu: probe of soc:pmu failed with error -16 This patch fix it up with adding CPUHP_AP_PERF_CSKY_ONLINE in cpuhotplug.h. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org>