rcu: Avoid spurious RCU CPU stall warnings
authorPaul E. McKenney <paul.mckenney@linaro.org>
Mon, 13 Aug 2012 18:17:06 +0000 (11:17 -0700)
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Sun, 23 Sep 2012 14:42:51 +0000 (07:42 -0700)
commitc96ea7cfdd88d0a67c970502bc5313fede34b86b
treeb5e8273bfa99f3ddf72e3a4fbfb6483b60d7f345
parentc8020a67e625c714c4dbedc8ae2944b461e204ec
rcu: Avoid spurious RCU CPU stall warnings

If a given CPU avoids the idle loop but also avoids starting a new
RCU grace period for a full minute, RCU can issue spurious RCU CPU
stall warnings.  This commit fixes this issue by adding a check for
ongoing grace period to avoid these spurious stall warnings.

Reported-by: Becky Bruce <bgillbruce@gmail.com>
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
kernel/rcutree.c