tree f1bcf34f229b9ab62612971903ccd61d05db7aea
parent 6f0c0580b70c89094b3422ba81118c7b959c7556
author Paul E. McKenney <paul.mckenney@linaro.org> 1348099118 -0700
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1351029325 -0700

rcu: Print remote CPU's stacks in stall warnings

The RCU CPU stall warnings rely on trigger_all_cpu_backtrace() to
do NMI-based dump of the stack traces of all CPUs.  Unfortunately, a
number of architectures do not implement trigger_all_cpu_backtrace(), in
which case RCU falls back to just dumping the stack of the running CPU.
This is unhelpful in the case where the running CPU has detected that
some other CPU has stalled.

This commit therefore makes the running CPU dump the stacks of the
tasks running on the stalled CPUs.

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