kmod: run usermodehelpers only on cpus allowed for kthreadd V2

kmod: run usermodehelpers only on cpus allowed for kthreadd V2

usermodehelper() threads can currently run on all processors.  This is an
issue for low latency cores.  Spawnig a new thread causes cpu holdoffs in
the range of hundreds of microseconds to a few milliseconds.  Not good for
cores on which processes run that need to react as fast as possible.

kthreadd threads can be restricted using taskset to a limited set of
processors.  Then the kernel thread pool will not fork processes on those
anymore thereby protecting those processors from additional latencies.

Make usermodehelper() threads obey the limitations that kthreadd is
restricted to.  Kthreadd is not the parent of usermodehelper threads so we
need to explicitly get the allowed processors for kthreadd.

Before this patch there is no way to limit the cpus that usermodehelper
can run on since the affinity is set when the thread is spawned to all
processors.

Signed-off-by: Christoph Lameter <cl@linux.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <bitbucket@online.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Gilad Ben-Yossef <gilad@benyossef.com>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>