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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2008-08-01 16:39:11 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-08-01 16:39:30 +0200 |
| commit | 934b2857cc576ae53c92a66e63fce7ddcfa74691 (patch) | |
| tree | 4a8e261d16739624bb91ed9f56062ec5f7401227 /include/asm-s390 | |
| parent | 3a95e8eb34f595a0144adb6e5513d456319bd8a5 (diff) | |
| download | linux-934b2857cc576ae53c92a66e63fce7ddcfa74691.tar.bz2 | |
[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.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/asm-s390/hardirq.h b/include/asm-s390/hardirq.h index 4b7cb964ff35..89ec7056da28 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 */ |