core-rcu-2021-04-28

 - Bitmap support for "N" as alias for last bit
 - kvfree_rcu updates
 - mm_dump_obj() updates.  (One of these is to mm, but was suggested by Andrew Morton.)
 - RCU callback offloading update
 - Polling RCU grace-period interfaces
 - Realtime-related RCU updates
 - Tasks-RCU updates
 - Torture-test updates
 - Torture-test scripting updates
 - Miscellaneous fixes

Signed-off-by: Ingo Molnar <mingo@kernel.org>