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authorHeiko Carstens <heiko.carstens@de.ibm.com>2008-11-14 12:18:04 -0500
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-11-14 12:18:53 -0500
commit632448f65001c4935ed0d3bb362017d773da2eca (patch)
treed1daf415fecdc1b9e353e3ad82e30c555961d325
parentaf4c68740e848019d8d14c52704ed8eacceddac6 (diff)
[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>
-rw-r--r--arch/s390/kernel/process.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 3e2c05cb6a87..04f8c67a6101 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -136,9 +136,12 @@ static void default_idle(void)
136 return; 136 return;
137 } 137 }
138 trace_hardirqs_on(); 138 trace_hardirqs_on();
139 /* Don't trace preempt off for idle. */
140 stop_critical_timings();
139 /* Wait for external, I/O or machine check interrupt. */ 141 /* Wait for external, I/O or machine check interrupt. */
140 __load_psw_mask(psw_kernel_bits | PSW_MASK_WAIT | 142 __load_psw_mask(psw_kernel_bits | PSW_MASK_WAIT |
141 PSW_MASK_IO | PSW_MASK_EXT); 143 PSW_MASK_IO | PSW_MASK_EXT);
144 start_critical_timings();
142} 145}
143 146
144void cpu_idle(void) 147void cpu_idle(void)