[PATCH tip/core/rcu 0/6] Documentation updates for 3.21^W4.1

Hello! This series contains a few documentation updates: 1. Record the fact that the rcutree.kthread_prio kernel boot parameter also controls the priority of the grace-period kthreads. 2. Update the kernel-per-CPU-kthreads.txt documentation based on Christoph Lameter's

[PATCH tip/core/rcu 0/6] Documentation updates for 3.21^W4.1

Hello! This series contains a few documentation updates: 1. Record the fact that the rcutree.kthread_prio kernel boot parameter also controls the priority of the grace-period kthreads. 2. Update the kernel-per-CPU-kthreads.txt documentation based on Christoph Lameter's