The biggest change to core locking facilities in this cycle is the introduction

of local_lock_t - this primitive comes from the -rt project and identifies
CPU-local locking dependencies normally handled opaquely beind preempt_disable()
or local_irq_save/disable() critical sections.

The generated code on mainline kernels doesn't change as a result, but still there
are benefits: improved debugging and better documentation of data structure
accesses.

The new local_lock_t primitives are introduced and then utilized in a couple of
kernel subsystems. No change in functionality is intended.

There's also other smaller changes and cleanups.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
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