From: "Steven Rostedt (Red Hat)" <rost...@goodmis.org>
Some callbacks of the function tracer use rcu_read_lock(). This means that
there's places that can not be traced because RCU is not tracking the CPU
for various reasons (like NO_HZ_FULL and coming back from userspace).
Thes functions need to be marked so that callbacks that use RCU do not
trace them.
Cc: Peter Zijlstra <pet...@infradead.org>
Signed-off-by: Steven Rostedt <rost...@goodmis.org>
---
kernel/sched/core.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index b7c32cb..9bd2aea 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1440,6 +1440,7 @@ void scheduler_ipi(void)
}
irq_exit();
}
+FTRACE_UNSAFE_RCU(scheduler_ipi);
static void ttwu_queue_remote(struct task_struct *p, int cpu)
{
@@ -3222,6 +3223,7 @@ int idle_cpu(int cpu)
return 1;
}
+FTRACE_UNSAFE_RCU(idle_cpu);
/**
* idle_task - return the idle task for a given cpu.
--
1.7.10.4
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