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| author | Paul E. McKenney <paul.mckenney@linaro.org> | 2011-11-01 08:57:21 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2011-12-11 10:31:42 -0800 |
| commit | 0989cb46783188ea7346ba6490be0046b9b7a725 (patch) | |
| tree | ab3ca7e6099efd9ca814e9202a679388f36ecc90 /kernel/rcutree.c | |
| parent | 4145fa7fbee3ec1e61c52825b146192885d9759f (diff) | |
| download | linux-0989cb46783188ea7346ba6490be0046b9b7a725.tar.gz linux-0989cb46783188ea7346ba6490be0046b9b7a725.tar.bz2 linux-0989cb46783188ea7346ba6490be0046b9b7a725.zip | |
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/rcutree.c')
| -rw-r--r-- | kernel/rcutree.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c index 06e40dd53b23..9888a0ad2d4e 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -356,10 +356,14 @@ static void rcu_idle_enter_common(struct rcu_dynticks *rdtp, long long oldval) } trace_rcu_dyntick("Start", oldval, rdtp->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()); + trace_rcu_dyntick("Error on entry: not idle task", oldval, rdtp->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! */ } /* CPUs seeing atomic_inc() must see prior RCU read-side crit sects */ smp_mb__before_atomic_inc(); /* See above. */ @@ -445,10 +449,14 @@ static void rcu_idle_exit_common(struct rcu_dynticks *rdtp, long long oldval) WARN_ON_ONCE(!(atomic_read(&rdtp->dynticks) & 0x1)); trace_rcu_dyntick("End", oldval, rdtp->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()); + trace_rcu_dyntick("Error on exit: not idle task", oldval, rdtp->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! */ } } |