* Steven Rostedt | 2014-07-01 11:14:44 [-0400]:

I talked with Peter Zijlstra about this, and he told me that the clearing
of the PF_NO_SETAFFINITY flag was to deal with the optimization of
migrate_disable/enable() that ignores tasks that have that flag set. But
that optimization was removed when I did a rework of the cpu hotplug code.

This has been already applied. You took it into v3.14 and while applying
the latest v3.14 patches it made its way into v3.18 as well.

Sebastian