docbook: add futexes to kernel-locking docbook
Add Fast User Mutexes (futexes) to kernel-locking docbook. Signed-off-by: NRandy Dunlap <rdunlap@infradead.org> Acked-by: NRob Landley <rob@landley.net> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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