[S390] ftrace: disable tracing on idle psw
Disable tracing on idle psw. Otherwise it would give us huge preempt off times for idle. Which is rather pointless. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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@ -136,9 +136,12 @@ static void default_idle(void)
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return;
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}
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trace_hardirqs_on();
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/* Don't trace preempt off for idle. */
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stop_critical_timings();
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/* Wait for external, I/O or machine check interrupt. */
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__load_psw_mask(psw_kernel_bits | PSW_MASK_WAIT |
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PSW_MASK_IO | PSW_MASK_EXT);
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start_critical_timings();
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}
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void cpu_idle(void)
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