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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: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2008-11-14 18:18:04 +01:00 committed by Martin Schwidefsky
parent af4c68740e
commit 632448f650
1 changed files with 3 additions and 0 deletions
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3
arch/s390/kernel/process.c
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@ -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)