cpu/hotplug: Provide cpuhp_setup/remove_state[_nocalls]_cpuslocked()

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Some call sites of cpuhp_setup/remove_state[_nocalls]() are within a
cpus_read locked region.

cpuhp_setup/remove_state[_nocalls]() call cpus_read_lock() as well, which
is possible in the current implementation but prevents converting the
hotplug locking to a percpu rwsem.

Provide locked versions of the interfaces to avoid nested calls to
cpus_read_lock().

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20170524081547.239600868@linutronix.de

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Sebastian Andrzej Siewior 2017-05-24 10:15:14 +02:00 • committed by Thomas Gleixner

parent ade3f680a7

commit 71def423fe

2 changed files with 65 additions and 11 deletions

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29

include/linux/cpuhotplug.h

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47

kernel/cpu.c

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