From 4c1051e37a0e2a941115c6fb7ba08c318f25a0f9 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Sun, 11 Mar 2012 11:59:27 -0400 Subject: [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 --- arch/s390/kernel/irq.c | 2 -- 1 file changed, 2 deletions(-) (limited to 'arch/s390/kernel/irq.c') diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c index b9a7fdd9c81..09a014c6253 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. */ -- cgit v1.2.3-70-g09d2