locking/lglocks: Add documentation of current lglocks implementation

Local/global locks are currently not documented anywhere other
than in an somewhat out-of-date LWN article - this is an attempt
to document the current state of lglocks.

This patch is against linux-next 3.18.0-rc6

Signed-off-by: Nicholas Mc Guire <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: Carsten Emde <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

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