hwtracing/coresight-etm3x: Use cpuhp_setup_state_nocalls_cpuslocked()
authorSebastian Andrzej Siewior <bigeasy@linutronix.de>
Wed, 24 May 2017 08:15:22 +0000 (10:15 +0200)
committerThomas Gleixner <tglx@linutronix.de>
Fri, 26 May 2017 08:10:39 +0000 (10:10 +0200)
commite560c89c8ac0baadf0da351f602c599016568fc7
treece94bd27e0b9186ba618b44c71b47505ab09582d
parent419af25fa4d0974fd758a668c08c369c19392a47
hwtracing/coresight-etm3x: Use cpuhp_setup_state_nocalls_cpuslocked()

etm_probe() holds get_online_cpus() while invoking
cpuhp_setup_state_nocalls().

cpuhp_setup_state_nocalls() invokes get_online_cpus() as well. This is
correct, but prevents the conversion of the hotplug locking to a percpu
rwsem.

Use cpuhp_setup_state_nocalls_cpuslocked() to avoid the nested
call. Convert *_online_cpus() to the new interfaces while at it.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/20170524081547.889092478@linutronix.de
drivers/hwtracing/coresight/coresight-etm3x.c