Merge branches 'doc.2015.01.07a', 'fixes.2015.01.15a', 'preempt.2015.01.06a', 'srcu...

doc.2015.01.07a: Documentation updates.
fixes.2015.01.15a: Miscellaneous fixes.
preempt.2015.01.06a: Changes to handling of lists of preempted tasks.
srcu.2015.01.06a: SRCU updates.
stall.2015.01.16a: RCU CPU stall-warning updates and fixes.
torture.2015.01.11a: RCU torture-test updates and fixes.

diff --cc Documentation/RCU/stallwarn.txt
Simple merge

diff --cc include/linux/rcupdate.h
Simple merge

diff --cc include/linux/rcutiny.h
Simple merge

diff --cc include/linux/rcutree.h
Simple merge

diff --cc init/Kconfig
Simple merge

diff --cc kernel/rcu/tiny.c
Simple merge

diff --cc kernel/rcu/tiny_plugin.h
Simple merge

diff --cc kernel/rcu/tree.c
Simple merge

diff --cc kernel/rcu/tree.h
Simple merge

diff --cc kernel/rcu/tree_plugin.h
Simple merge

diff --cc lib/Kconfig.debug
Simple merge