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Will Deacon 54d11983c2 arm64: smp: Tell RCU about CPUs that fail to come online 
[ Upstream commit 04e613ded8 ]

Commit ce3d31ad3c ("arm64/smp: Move rcu_cpu_starting() earlier") ensured
that RCU is informed early about incoming CPUs that might end up calling
into printk() before they are online. However, if such a CPU fails the
early CPU feature compatibility checks in check_local_cpu_capabilities(),
then it will be powered off or parked without informing RCU, leading to
an endless stream of stalls:

  | rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
  | rcu:	2-O...: (0 ticks this GP) idle=002/1/0x4000000000000000 softirq=0/0 fqs=2593
  | (detected by 0, t=5252 jiffies, g=9317, q=136)
  | Task dump for CPU 2:
  | task:swapper/2       state:R  running task     stack:    0 pid:    0 ppid:     1 flags:0x00000028
  | Call trace:
  | ret_from_fork+0x0/0x30

Ensure that the dying CPU invokes rcu_report_dead() prior to being powered
off or parked.

Cc: Qian Cai <cai@redhat.com>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Suggested-by: Qian Cai <cai@redhat.com>
Link: https://lore.kernel.org/r/20201105222242.GA8842@willie-the-truck
Link: https://lore.kernel.org/r/20201106103602.9849-3-will@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2020-11-24 13:29:01 +01:00
..
Kconfig rcu: Use CONFIG_PREEMPTION 2019-07-31 19:03:35 +02:00
Kconfig.debug rcu: Add support for consolidated-RCU reader checking 2019-08-09 11:00:35 -07:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
rcu.h rcu: Add kernel parameter to dump trace after RCU CPU stall warning 2019-08-01 14:05:51 -07:00
rcu_segcblist.c rcu/nocb: Add bypass callback queueing 2019-08-13 14:37:32 -07:00
rcu_segcblist.h rcu/nocb: Add bypass callback queueing 2019-08-13 14:37:32 -07:00
rcuperf.c rcuperf: Make rcuperf kernel test more robust for !expedited mode 2019-08-01 14:30:22 -07:00
rcutorture.c rcu/nocb: Print no-CBs diagnostics when rcutorture writer unduly delayed 2019-08-13 14:38:24 -07:00
srcutiny.c srcu: Remove cleanup_srcu_struct_quiesced() 2019-03-26 14:39:24 -07:00
srcutree.c srcu: Apply *_ONCE() to ->srcu_last_gp_end 2020-02-11 04:35:08 -08:00
sync.c rcu/sync: Simplify the state machine 2019-05-28 09:05:23 -07:00
tiny.c rcu: rcu_qs -- Use raise_softirq_irqoff to not save irqs twice 2019-03-26 14:37:49 -07:00
tree.c arm64: smp: Tell RCU about CPUs that fail to come online 2020-11-24 13:29:01 +01:00
tree.h rcu/nocb: Print no-CBs diagnostics when rcutorture writer unduly delayed 2019-08-13 14:38:24 -07:00
tree_exp.h rcu: Allow only one expedited GP to run concurrently with wakeups 2020-03-05 16:43:50 +01:00
tree_plugin.h rcu/nocb: Fix dump_tree hierarchy print always active 2020-02-24 08:36:22 +01:00
tree_stall.h Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-09-16 17:25:49 -07:00
update.c Merge branches 'consolidate.2019.08.01b', 'fixes.2019.08.12a', 'lists.2019.08.13a' and 'torture.2019.08.01b' into HEAD 2019-08-13 14:30:30 -07:00