[GIT PULL] RCU changes for v4.4

Linus, Please pull the latest core-rcu-for-linus git tree from: git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core-rcu-for-linus # HEAD: b33e18f61bd18227a456016a77b1a968f5bc1d65 fs/writeback, rcu: Don't use list_entry_rcu() for pointer offsetting in bdi_split_work_to_wbs()

[GIT PULL] RCU changes for v4.4

Linus, Please pull the latest core-rcu-for-linus git tree from: git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core-rcu-for-linus # HEAD: b33e18f61bd18227a456016a77b1a968f5bc1d65 fs/writeback, rcu: Don't use list_entry_rcu() for pointer offsetting in bdi_split_work_to_wbs()