tree 0d9bf224e4ea6a40d051cbf63b798ac0bd3e5aae
parent 8f2bf660b8a34589ac7be168a654e05614224cff
author Paul E. McKenney <paul.mckenney@linaro.org> 1348099118 -0700
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1348178711 -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>