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tick-sched: Clarify "NOHZ: local_softirq_pending" warning
Currently, can_stop_idle_tick() prints "NOHZ: local_softirq_pending HH" (where "HH" is the hexadecimal softirq vector number) when one or more non-RCU softirq handlers are still enabled when checking to stop the scheduler-tick interrupt. This message is not as enlightening as one might hope, so this commit changes it to "NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #HH". Reported-by: Andy Lutomirski <luto@kernel.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@kernel.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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@ -927,7 +927,7 @@ static bool can_stop_idle_tick(int cpu, struct tick_sched *ts)
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if (ratelimit < 10 &&
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if (ratelimit < 10 &&
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(local_softirq_pending() & SOFTIRQ_STOP_IDLE_MASK)) {
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(local_softirq_pending() & SOFTIRQ_STOP_IDLE_MASK)) {
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pr_warn("NOHZ: local_softirq_pending %02x\n",
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pr_warn("NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #%02x!!!\n",
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(unsigned int) local_softirq_pending());
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(unsigned int) local_softirq_pending());
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ratelimit++;
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ratelimit++;
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}
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}
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