Merge LKMM and RCU commits

Documentation/RCU/Design/Requirements/Requirements.html

Documentation/RCU/stallwarn.txt

Documentation/admin-guide/kernel-parameters.txt

MAINTAINERS

arch/arm/kernel/smp.c

arch/powerpc/include/asm/kvm_book3s_64.h

arch/x86/pci/mmconfig-shared.c

drivers/acpi/osl.c

drivers/base/base.h

drivers/base/core.c

drivers/base/power/runtime.c

include/linux/rcu_segcblist.h

include/linux/rcu_sync.h

include/linux/rculist.h

include/linux/rcupdate.h

include/trace/events/rcu.h

kernel/locking/lockdep.c

kernel/rcu/Kconfig.debug

kernel/rcu/rcu.h

kernel/rcu/rcu_segcblist.c