diff options
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/s390_ext.h | 2 | ||||
| -rw-r--r-- | arch/s390/kernel/s390_ext.c | 23 | ||||
| -rw-r--r-- | arch/s390/mm/fault.c | 2 |
3 files changed, 26 insertions, 1 deletions
diff --git a/arch/s390/include/asm/s390_ext.h b/arch/s390/include/asm/s390_ext.h index 080876d5f196..85b2154b899f 100644 --- a/arch/s390/include/asm/s390_ext.h +++ b/arch/s390/include/asm/s390_ext.h @@ -13,5 +13,7 @@ typedef void (*ext_int_handler_t)(unsigned int, unsigned int, unsigned long); int register_external_interrupt(__u16 code, ext_int_handler_t handler); int unregister_external_interrupt(__u16 code, ext_int_handler_t handler); +void service_subclass_irq_register(void); +void service_subclass_irq_unregister(void); #endif /* _S390_EXTINT_H */ diff --git a/arch/s390/kernel/s390_ext.c b/arch/s390/kernel/s390_ext.c index 185029919c4d..87b5c532abf1 100644 --- a/arch/s390/kernel/s390_ext.c +++ b/arch/s390/kernel/s390_ext.c @@ -106,3 +106,26 @@ void __irq_entry do_extint(struct pt_regs *regs, unsigned int ext_int_code, irq_exit(); set_irq_regs(old_regs); } + +static DEFINE_SPINLOCK(sc_irq_lock); +static int sc_irq_refcount; + +void service_subclass_irq_register(void) +{ + spin_lock(&sc_irq_lock); + if (!sc_irq_refcount) + ctl_set_bit(0, 9); + sc_irq_refcount++; + spin_unlock(&sc_irq_lock); +} +EXPORT_SYMBOL(service_subclass_irq_register); + +void service_subclass_irq_unregister(void) +{ + spin_lock(&sc_irq_lock); + sc_irq_refcount--; + if (!sc_irq_refcount) + ctl_clear_bit(0, 9); + spin_unlock(&sc_irq_lock); +} +EXPORT_SYMBOL(service_subclass_irq_unregister); diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c index e46ba2927424..6e922b50efa4 100644 --- a/arch/s390/mm/fault.c +++ b/arch/s390/mm/fault.c @@ -613,7 +613,7 @@ static int __init pfault_irq_init(void) rc = pfault_init() == 0 ? 0 : -EOPNOTSUPP; if (rc) goto out_pfault; - ctl_set_bit(0, 9); + service_subclass_irq_register(); hotcpu_notifier(pfault_cpu_notify, 0); return 0; |