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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2012-03-11 11:59:27 -0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2012-03-11 11:59:28 -0400
commit4c1051e37a0e2a941115c6fb7ba08c318f25a0f9 (patch)
treef228f1a90c0d7abb8308f275d0906dd7d1588ba3 /arch/s390/kernel/irq.c
parent8b646bd759086f6090fe27acf414c0b5faa737f4 (diff)
[S390] rework idle code
Whenever the cpu loads an enabled wait PSW it will appear as idle to the underlying host system. The code in default_idle calls vtime_stop_cpu which does the necessary voodoo to get the cpu time accounting right. The udelay code just loads an enabled wait PSW. To correct this rework the vtime_stop_cpu/vtime_start_cpu logic and move the difficult parts to entry[64].S, vtime_stop_cpu can now be called from anywhere and vtime_start_cpu is gone. The correction of the cpu time during wakeup from an enabled wait PSW is done with a critical section in entry[64].S. As vtime_start_cpu is gone, s390_idle_check can be removed as well. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/irq.c')
-rw-r--r--arch/s390/kernel/irq.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
index b9a7fdd9c814..09a014c62537 100644
--- a/arch/s390/kernel/irq.c
+++ b/arch/s390/kernel/irq.c
@@ -219,8 +219,6 @@ void __irq_entry do_extint(struct pt_regs *regs, unsigned int ext_int_code,
code = (unsigned short) ext_int_code;
old_regs = set_irq_regs(regs);
- s390_idle_check(regs, S390_lowcore.int_clock,
- S390_lowcore.async_enter_timer);
irq_enter();
if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator)
/* Serve timer interrupts first. */