rcu: Diagnostics for grace-period startup hangs

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This commit causes a splat if RCU is idle and a request for a new grace
period is ignored for more than one second.  This splat normally indicates
that some code path asked for a new grace period, but failed to wake up
the RCU grace-period kthread.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
[ paulmck: Fix bug located by Dan Carpenter and his static checker. ]
[ paulmck: Fix self-deadlock bug located 0day test robot. ]
[ paulmck: Disable unless CONFIG_PROVE_RCU=y. ]

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Paul E. McKenney 2018-04-21 20:44:11 -07:00

parent 8c42b1f39f

commit 26d950a945

2 changed files with 66 additions and 2 deletions

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66

kernel/rcu/tree.c

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2

kernel/rcu/tree.h

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