rcu: Check for jiffies going backwards

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A report of a 12-jiffy normal RCU CPU stall warning raises interesting
questions about the nature of time on the offending system.  This commit
instruments rcu_sched_clock_irq(), which is RCU's hook into the
scheduling-clock interrupt, checking for the jiffies counter going
backwards.

Reported-by: Saravanan D <sarvanand@fb.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

...

This commit is contained in:

Paul E. McKenney 2022-02-23 17:29:37 -08:00

parent 90d2efe7bd

commit c708b08c65

2 changed files with 11 additions and 0 deletions

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10

kernel/rcu/tree.c

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1

kernel/rcu/tree.h

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