rcu: Dump only the current CPU's buffers for idle-entry/exit warnings

Problems in RCU idle entry and exit are almost always confined to the
offending CPU.  This commit therefore switches ftrace_dump() from
DUMP_ALL to DUMP_ORIG.

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Tested-by: Pascal Chapperon <pascal.chapperon@wanadoo.fr>

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 4b97bba7396e6194db4bf5b644ef8b5a1997c974..6eb48f13eeeb7227b876990f0c58697a92273f4c 100644 (file)
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -358,7 +358,7 @@ static void rcu_idle_enter_common(struct rcu_dynticks *rdtp, long long oldval)
                struct task_struct *idle = idle_task(smp_processor_id());
 
                trace_rcu_dyntick("Error on entry: not idle task", oldval, 0);
-               ftrace_dump(DUMP_ALL);
+               ftrace_dump(DUMP_ORIG);
                WARN_ONCE(1, "Current pid: %d comm: %s / Idle pid: %d comm: %s",
                          current->pid, current->comm,
                          idle->pid, idle->comm); /* must be idle task! */
@@ -468,7 +468,7 @@ static void rcu_idle_exit_common(struct rcu_dynticks *rdtp, long long oldval)
 
                trace_rcu_dyntick("Error on exit: not idle task",
                                  oldval, rdtp->dynticks_nesting);
-               ftrace_dump(DUMP_ALL);
+               ftrace_dump(DUMP_ORIG);
                WARN_ONCE(1, "Current pid: %d comm: %s / Idle pid: %d comm: %s",
                          current->pid, current->comm,
                          idle->pid, idle->comm); /* must be idle task! */