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7aa92230c9
linux/kernel/rcu
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Paul E. McKenney 7aa92230c9 rcu: Once again use NMI-based stack traces in stall warnings 
This commit is for all intents and purposes a revert of bc1dce514e
("rcu: Don't use NMIs to dump other CPUs' stacks").  The reason to suppose
that this can now safely be reverted is the presence of 42a0bb3f71
("printk/nmi: generic solution for safe printk in NMI"), which is said
to have made NMI-based stack dumps safe.

However, this reversion keeps one nice property of bc1dce514e
("rcu: Don't use NMIs to dump other CPUs' stacks"), namely that
only those CPUs blocking the grace period are dumped.  The new
trigger_single_cpu_backtrace() is used to make this happen, as
suggested by Josh Poimboeuf.

Reported-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2017-01-23 11:37:12 -08:00
..
Makefile rcutorture: Add RCU grace-period performance tests 2016-03-31 13:37:38 -07:00
rcu.h rcu: Narrow early boot window of illegal synchronous grace periods 2017-01-14 21:23:48 -08:00
rcuperf.c rcuperf: Consistently insert space between flag and message 2016-08-22 10:06:16 -07:00
rcutorture.c torture: Trace long read-side delays 2016-11-14 10:46:30 -08:00
srcu.c rcu: Add rcu_normal kernel parameter to suppress expediting 2015-12-04 12:26:53 -08:00
sync.c locking, rcu, cgroup: Avoid synchronize_sched() in __cgroup_procs_write() 2016-08-18 15:36:59 +02:00
tiny_plugin.h rcu: Narrow early boot window of illegal synchronous grace periods 2017-01-14 21:23:48 -08:00
tiny.c rcu: Remove unneeded rcu_process_callbacks() declarations 2017-01-23 11:32:29 -08:00
tree_exp.h rcu: Narrow early boot window of illegal synchronous grace periods 2017-01-14 21:23:48 -08:00
tree_plugin.h rcu: Narrow early boot window of illegal synchronous grace periods 2017-01-14 21:23:48 -08:00
tree_trace.c rcu: Drive expedited grace periods from workqueue 2016-08-22 09:30:25 -07:00
tree.c rcu: Once again use NMI-based stack traces in stall warnings 2017-01-23 11:37:12 -08:00
tree.h rcu: Make expedited grace periods recheck dyntick idle state 2016-11-14 10:46:31 -08:00
update.c rcu: update: Make RCU_EXPEDITE_BOOT be the default 2017-01-16 16:56:39 -08:00