tree 9f933aa0ba7aad4000130d853c2d99fa623c8b33
parent 42528795ac1c8d7ba021797ec004904168956d64
author Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1428772190 -0700
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1428850227 -0700

cpu: Defer smpboot kthread unparking until CPU known to scheduler

Currently, smpboot_unpark_threads() is invoked before the incoming CPU
has been added to the scheduler's runqueue structures.  This might
potentially cause the unparked kthread to run on the wrong CPU, since the
correct CPU isn't fully set up yet.

This experimental commit places smpboot_unpark_threads() in a CPU hotplug
notifier with priority set so that these kthreads are unparked just after
the CPU has been added to the runqueues.

Reported-and-tested-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>