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[S390] Convert s390 to GENERIC_CLOCKEVENTS.

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This way we get rid of s390's NO_IDLE_HZ and use the generic dynticks
variant instead. In addition we get high resolution timers for free.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Heiko Carstens 2008-04-17 07:46:25 +02:00
parent d7b906897e
commit 5a62b19219
9 changed files with 98 additions and 228 deletions
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14
arch/s390/lib/delay.c
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@ -34,7 +34,7 @@ void __delay(unsigned long loops)
*/
void __udelay(unsigned long usecs)
{
u64 end, time, jiffy_timer = 0;
u64 end, time, old_cc = 0;
unsigned long flags, cr0, mask, dummy;
int irq_context;
@ -43,8 +43,8 @@ void __udelay(unsigned long usecs)
local_bh_disable();
local_irq_save(flags);
if (raw_irqs_disabled_flags(flags)) {
jiffy_timer = S390_lowcore.jiffy_timer;
S390_lowcore.jiffy_timer = -1ULL - (4096 << 12);
old_cc = S390_lowcore.clock_comparator;
S390_lowcore.clock_comparator = -1ULL;
__ctl_store(cr0, 0, 0);
dummy = (cr0 & 0xffff00e0) | 0x00000800;
__ctl_load(dummy , 0, 0);
@ -55,8 +55,8 @@ void __udelay(unsigned long usecs)
end = get_clock() + ((u64) usecs << 12);
do {
time = end < S390_lowcore.jiffy_timer ?
end : S390_lowcore.jiffy_timer;
time = end < S390_lowcore.clock_comparator ?
end : S390_lowcore.clock_comparator;
set_clock_comparator(time);
trace_hardirqs_on();
__load_psw_mask(mask);
@ -65,10 +65,10 @@ void __udelay(unsigned long usecs)
if (raw_irqs_disabled_flags(flags)) {
__ctl_load(cr0, 0, 0);
S390_lowcore.jiffy_timer = jiffy_timer;
S390_lowcore.clock_comparator = old_cc;
}
if (!irq_context)
_local_bh_enable();
set_clock_comparator(S390_lowcore.jiffy_timer);
set_clock_comparator(S390_lowcore.clock_comparator);
local_irq_restore(flags);
}