rcu: remove irq work for rsp_wakeup()

It is safe to aquire scheduler lock in rnp->lock since the rcu read lock is
always deadlock-immunity(rnp->lock is always can't be nested in scheduler lock)

it partial revert patch 016a8d5b.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
2 files changed