tree d963e39a429eda7aa9de95e0084e6333432527a7
parent f15838e9cac8f78f0cc506529bb9d3b9fa589c1f
author Denis Kirjanov <kda@linux-powerpc.org> 1450124286 +0300
committer Michael Ellerman <mpe@ellerman.id.au> 1455531003 +1100

powerpc/pseries: Don't trace hcalls on offline CPUs

If a cpu is hotplugged while the hcall trace points are active, it's
possible to hit a warning from RCU due to the trace points calling into
RCU from an offline cpu, eg:

  RCU used illegally from offline CPU!
  rcu_scheduler_active = 1, debug_locks = 1

Make the hypervisor tracepoints conditional by using
TRACE_EVENT_FN_COND.

Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Denis Kirjanov <kda@linux-powerpc.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>