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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 /include/asm-s390
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 'include/asm-s390')
-rw-r--r--include/asm-s390/hardirq.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/asm-s390/hardirq.h b/include/asm-s390/hardirq.h
index 4b7cb96..89ec705 100644
--- a/include/asm-s390/hardirq.h
+++ b/include/asm-s390/hardirq.h
@@ -34,4 +34,18 @@ typedef struct {
void clock_comparator_work(void);
+static inline unsigned long long local_tick_disable(void)
+{
+ unsigned long long old;
+
+ old = S390_lowcore.clock_comparator;
+ S390_lowcore.clock_comparator = -1ULL;
+ return old;
+}
+
+static inline void local_tick_enable(unsigned long long comp)
+{
+ S390_lowcore.clock_comparator = comp;
+}
+
#endif /* __ASM_HARDIRQ_H */
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