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authorPaul E. McKenney <paul.mckenney@linaro.org>2011-11-01 08:57:21 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-12-11 10:31:42 -0800
commit0989cb46783188ea7346ba6490be0046b9b7a725 (patch)
treeab3ca7e6099efd9ca814e9202a679388f36ecc90 /kernel/rcutiny.c
parent4145fa7fbee3ec1e61c52825b146192885d9759f (diff)
downloadlinux-0989cb46783188ea7346ba6490be0046b9b7a725.tar.bz2
rcu: Add more information to the wrong-idle-task complaint
The current code just complains if the current task is not the idle task. This commit therefore adds printing of the identity of the idle task. 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>
Diffstat (limited to 'kernel/rcutiny.c')
-rw-r--r--kernel/rcutiny.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/kernel/rcutiny.c b/kernel/rcutiny.c
index 9b9bdf666fb5..6d70ff71a875 100644
--- a/kernel/rcutiny.c
+++ b/kernel/rcutiny.c
@@ -65,10 +65,14 @@ static void rcu_idle_enter_common(long long oldval)
}
RCU_TRACE(trace_rcu_dyntick("Start", oldval, rcu_dynticks_nesting));
if (!idle_cpu(smp_processor_id())) {
- WARN_ON_ONCE(1); /* must be idle task! */
+ struct task_struct *idle = idle_task(smp_processor_id());
+
RCU_TRACE(trace_rcu_dyntick("Error on entry: not idle task",
oldval, rcu_dynticks_nesting));
ftrace_dump(DUMP_ALL);
+ 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! */
}
rcu_sched_qs(0); /* implies rcu_bh_qsctr_inc(0) */
}
@@ -115,10 +119,14 @@ static void rcu_idle_exit_common(long long oldval)
}
RCU_TRACE(trace_rcu_dyntick("End", oldval, rcu_dynticks_nesting));
if (!idle_cpu(smp_processor_id())) {
- WARN_ON_ONCE(1); /* must be idle task! */
+ struct task_struct *idle = idle_task(smp_processor_id());
+
RCU_TRACE(trace_rcu_dyntick("Error on exit: not idle task",
oldval, rcu_dynticks_nesting));
ftrace_dump(DUMP_ALL);
+ 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! */
}
}