rcu: Reduce default RCU CPU stall warning timeout

The RCU CPU stall warning timeout has defaulted to 60 seconds for
some years, with almost no false positives.  This commit therefore
reduces the default to 21 seconds, slightly shorter than the new
soft-lockup timeout.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 28e9d6c98941290108acdf8e73953022975e8bc2..41faf0b8df1df9f2f5d9cb12eb01980526025ec4 100644 (file)
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -972,7 +972,7 @@ config RCU_CPU_STALL_TIMEOUT
        int "RCU CPU stall timeout in seconds"
        depends on TREE_RCU || TREE_PREEMPT_RCU
        range 3 300
-       default 60
+       default 21
        help
          If a given RCU grace period extends more than the specified
          number of seconds, a CPU stall warning is printed.  If the