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authorHeiko Carstens <heiko.carstens@de.ibm.com>2008-04-17 07:46:25 +0200
committerHeiko Carstens <heiko.carstens@de.ibm.com>2008-04-17 07:47:05 +0200
commit5a62b192196af9a798e2f2f4c6a1324e7edf2f4b (patch)
tree0aa96ba3153b257000be22e49befbde2b5bd6917 /arch/s390/lib
parentd7b906897e9caae452947e33674df0a2d6f7e10f (diff)
downloadlinux-linaro-android-5a62b192196af9a798e2f2f4c6a1324e7edf2f4b.tar.gz
[S390] Convert s390 to GENERIC_CLOCKEVENTS.
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>
Diffstat (limited to 'arch/s390/lib')
-rw-r--r--arch/s390/lib/delay.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/arch/s390/lib/delay.c b/arch/s390/lib/delay.c
index 70f2a862b67..eae21a8ac72 100644
--- a/arch/s390/lib/delay.c
+++ b/arch/s390/lib/delay.c
@@ -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);
}