[RFC][PATCH 0/5] Getting rid of smp_mb__before_spinlock

[Peter Zijlstra]

There was a thread on this somewhere about a year ago, I finally remembered to
finish this :-)

This series removes two smp_mb__before_spinlock() (ab)users and converts the
scheduler to use smp_mb__after_spinlock(), which provides more guarantees with
the same amount of barriers.