rcu: Make RCU CPU stall warnings check for irq-disabled CPUs

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One common question upon seeing an RCU CPU stall warning is "did
the stalled CPUs have interrupts disabled?"  However, the current
stall warnings are silent on this point.  This commit therefore
uses irq_work to check whether stalled CPUs still respond to IPIs,
and flags this state in the RCU CPU stall warning console messages.

Reported-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

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This commit is contained in:

Paul E. McKenney 2017-08-17 17:05:59 -07:00

parent f79c3ad618

commit 9b9500da81

3 changed files with 103 additions and 13 deletions

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104

kernel/rcu/tree.c

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5

kernel/rcu/tree.h

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7

kernel/rcu/tree_plugin.h

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