tree 807cc0618bc843800aa85fd6d20b4e9ee7adb74b
parent 6206ab9bab620fc0fbbed30ce20d145b0b3d1840
author Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1312367664 -0700
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1317271116 -0700

rcu: Dump local stack if cannot dump all CPUs' stacks

The trigger_all_cpu_backtrace() function is a no-op in architectures that
do not define arch_trigger_all_cpu_backtrace.  On such architectures, RCU
CPU stall warning messages contain no stack trace information, which makes
debugging quite difficult.  This commit therefore substitutes dump_stack()
for architectures that do not define arch_trigger_all_cpu_backtrace,
so that at least the local CPU's stack is dumped as part of the RCU CPU
stall warning message.

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