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[S390] nohz/sclp: disable timer on synchronous waits.

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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>
This commit is contained in:
Heiko Carstens
2008-08-01 16:39:11 +02:00
committed by Martin Schwidefsky
parent 3a95e8eb34
commit 934b2857cc
3 changed files with 20 additions and 4 deletions
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4
arch/s390/lib/delay.c
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@@ -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();