Revert "htc: go fuck yourselves"

This reverts commit a40278a04dfbd253527be730e3afa8b8bc67c9d2.
Revert "rcu: Stop rcu_do_batch() from multiplexing the "count" variable"

This reverts commit 181dff4307949cb3bd7ba7c453a74cf1a82bfe0c.
Revert "Revert "rcu: Move PREEMPT_RCU preemption to switch_to() invocation""

This reverts commit ab289d09b58aafb17b6a6ad8d0ec5278425bca5f.
Revert "rcu: Precompute RCU_FAST_NO_HZ timer offsets"

This reverts commit f40847be0c788bfa22ee7bacfb6d5decb39ac83a.
Revert "rcu: Move _rcu_barrier()'s rcu_head structures to rcu_data structures"

This reverts commit e1e4bb6bc2b252de5504f614873236cc15d8f256.
Revert "rcu: Update RCU_FAST_NO_HZ tracing for lazy callbacks"

This reverts commit 7bdb3dff75d5aee36e6cc4d14c2b7cea55d5473c.
Revert "timer: Fix mod_timer_pinned() header comment"

This reverts commit 4d8a8803258a3d992b147cf447657f553a48d7a9.
Revert "rcu: Make rcu_barrier() less disruptive"

This reverts commit 4ad70a8cdaa5c46fef6ea48b8fc78faecc5fdd38.
Revert "rcu: Make exit_rcu() more precise and consolidate"

This reverts commit 0f790e7c6af296c417590d3f400ab3122befbc7f.
Revert "rcu: Move PREEMPT_RCU preemption to switch_to() invocation"

This reverts commit d3466c9a7314ad713fe0e7ba8ad051d20b87cee3.
Revert "rcu: Explicitly initialize RCU_FAST_NO_HZ per-CPU variables"

This reverts commit 3ba1767a4a81e77debadb8340aab7400c4176021.
Revert "rcu: Make RCU_FAST_NO_HZ handle timer migration"

This reverts commit 66a65cf1e20ed8cc0f06d913f53ac79b5569e809.
Revert "rcu: Ensure that RCU_FAST_NO_HZ timers expire on correct CPU"

This reverts commit 1d82a9d5861fbdce6a876d0ed9c64e51aa2d4e6b.
Revert "rcu: Add warning for RCU_FAST_NO_HZ timer firing"

This reverts commit 0502f13f66d9847cd94e98b51f0d617e0e39f96d.
Revert "rcu: Make RCU_FAST_NO_HZ account for pauses out of idle"

This reverts commit 4ab2e3bb803267ab7ef1cf91dd54b469f2431d15.
Revert "rcu: Make RCU_FAST_NO_HZ use timer rather than hrtimer"

This reverts commit f4aaab85963568ee039639161210a7e29a121c87.
Revert "rcu: Add RCU_FAST_NO_HZ tracing for idle exit"

This reverts commit db586a85da9d7ebc2f4e3c9544dcf95f6ebbfa69.