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authorHeiko Carstens <heiko.carstens@de.ibm.com>2008-08-01 16:39:11 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-08-01 16:39:30 +0200
commit934b2857cc576ae53c92a66e63fce7ddcfa74691 (patch)
tree4a8e261d16739624bb91ed9f56062ec5f7401227 /arch/s390/lib/delay.c
parent3a95e8eb34f595a0144adb6e5513d456319bd8a5 (diff)
downloadop-kernel-dev-934b2857cc576ae53c92a66e63fce7ddcfa74691.zip
op-kernel-dev-934b2857cc576ae53c92a66e63fce7ddcfa74691.tar.gz
[S390] nohz/sclp: disable timer on synchronous waits.
sclp_sync_wait wait synchronously for an sclp interrupt and disables timer interrupts. However on the irq enter paths there is an extra check if a timer interrupt would be due and calls the timer callback. This would schedule softirqs in the wrong context. So introduce local_tick_enable/disable which prevents this. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/lib/delay.c')
-rw-r--r--arch/s390/lib/delay.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/s390/lib/delay.c b/arch/s390/lib/delay.c
index eae21a8..fc6ab60 100644
--- a/arch/s390/lib/delay.c
+++ b/arch/s390/lib/delay.c
@@ -43,7 +43,7 @@ void __udelay(unsigned long usecs)
local_bh_disable();
local_irq_save(flags);
if (raw_irqs_disabled_flags(flags)) {
- old_cc = S390_lowcore.clock_comparator;
+ old_cc = local_tick_disable();
S390_lowcore.clock_comparator = -1ULL;
__ctl_store(cr0, 0, 0);
dummy = (cr0 & 0xffff00e0) | 0x00000800;
@@ -65,7 +65,7 @@ void __udelay(unsigned long usecs)
if (raw_irqs_disabled_flags(flags)) {
__ctl_load(cr0, 0, 0);
- S390_lowcore.clock_comparator = old_cc;
+ local_tick_enable(old_cc);
}
if (!irq_context)
_local_bh_enable();
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