[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>
diff --git a/arch/s390/include/asm/timer.h b/arch/s390/include/asm/timer.h
index 814243c..e63069b 100644
--- a/arch/s390/include/asm/timer.h
+++ b/arch/s390/include/asm/timer.h
@@ -33,8 +33,8 @@
spinlock_t lock;
__u64 timer; /* last programmed timer */
__u64 elapsed; /* elapsed time of timer expire values */
- __u64 idle; /* temp var for idle */
- int do_spt; /* =1: reprogram cpu timer in idle */
+ __u64 idle_enter; /* cpu timer on idle enter */
+ __u64 idle_exit; /* cpu timer on idle exit */
};
extern void init_virt_timer(struct vtimer_list *timer);