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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-03-11 11:59:27 -0400 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-03-11 11:59:28 -0400 |
| commit | 4c1051e37a0e2a941115c6fb7ba08c318f25a0f9 (patch) | |
| tree | f228f1a90c0d7abb8308f275d0906dd7d1588ba3 /drivers/s390 | |
| parent | 8b646bd759086f6090fe27acf414c0b5faa737f4 (diff) | |
| download | linux-next-4c1051e37a0e2a941115c6fb7ba08c318f25a0f9.tar.gz | |
[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 'drivers/s390')
| -rw-r--r-- | drivers/s390/cio/cio.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c index dc67c397449e..a49c46c91983 100644 --- a/drivers/s390/cio/cio.c +++ b/drivers/s390/cio/cio.c @@ -601,8 +601,6 @@ void __irq_entry do_IRQ(struct pt_regs *regs) struct pt_regs *old_regs; old_regs = set_irq_regs(regs); - s390_idle_check(regs, S390_lowcore.int_clock, - S390_lowcore.async_enter_timer); irq_enter(); __this_cpu_write(s390_idle.nohz_delay, 1); if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) |