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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 /arch/s390 | |
| parent | 3a95e8eb34f595a0144adb6e5513d456319bd8a5 (diff) | |
| download | linux-934b2857cc576ae53c92a66e63fce7ddcfa74691.tar.gz linux-934b2857cc576ae53c92a66e63fce7ddcfa74691.tar.bz2 linux-934b2857cc576ae53c92a66e63fce7ddcfa74691.zip | |
[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')
| -rw-r--r-- | arch/s390/lib/delay.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/s390/lib/delay.c b/arch/s390/lib/delay.c index eae21a8ac72d..fc6ab6094df8 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(); |