Merge branches 'bigrt.2012.09.20a', 'doctorture.2012.09.18a', 'fixes.2012.09.20a', 'hotplug.2012.09.17a' and 'idle.2012.09.18b' into HEAD
bigrt.2012.09.17c contains additional commits to reduce scheduling
latency from RCU on huge systems (many hundrends or thousands
of CPUs).
doctorture.2012.09.18a contains documentation changes and rcutorture fixes.
fixes.2012.09.17a contains miscellaneous fixes.
hotplug.2012.09.17a contains CPU-hotplug-related changes.
idle.2012.09.18b contains additional RCU changes in support of Frederic's
adaptive dynticks and also fixes architectures for which RCU no
longer considered the idle loop to be a quiescent state due to
earlier adaptive-dynticks changes. Affected architectures are
alpha, cris, frv, h8300, m32r, m68k, mn10300, parisc, score,
xtensa, and ia64.
