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Commit 632448f6 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
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[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: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent af4c6874

arch/s390/kernel/process.c

+3 −0
Original line number Diff line number Diff line
@@ -136,9 +136,12 @@ static void default_idle(void) 
		return;

	}

	trace_hardirqs_on();

	/* Don't trace preempt off for idle. */

	stop_critical_timings();

	/* Wait for external, I/O or machine check interrupt. */

	__load_psw_mask(psw_kernel_bits | PSW_MASK_WAIT |

			PSW_MASK_IO | PSW_MASK_EXT);

	start_critical_timings();

}



void cpu_idle(void)