diff options
Diffstat (limited to 'arch/x86/kernel/irq_64.c')
| -rw-r--r-- | arch/x86/kernel/irq_64.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c index 6b5c730d67b9..6c3a3b6e5cf4 100644 --- a/arch/x86/kernel/irq_64.c +++ b/arch/x86/kernel/irq_64.c | |||
| @@ -20,6 +20,26 @@ | |||
| 20 | 20 | ||
| 21 | atomic_t irq_err_count; | 21 | atomic_t irq_err_count; |
| 22 | 22 | ||
| 23 | /* | ||
| 24 | * 'what should we do if we get a hw irq event on an illegal vector'. | ||
| 25 | * each architecture has to answer this themselves. | ||
| 26 | */ | ||
| 27 | void ack_bad_irq(unsigned int irq) | ||
| 28 | { | ||
| 29 | printk(KERN_WARNING "unexpected IRQ trap at vector %02x\n", irq); | ||
| 30 | /* | ||
| 31 | * Currently unexpected vectors happen only on SMP and APIC. | ||
| 32 | * We _must_ ack these because every local APIC has only N | ||
| 33 | * irq slots per priority level, and a 'hanging, unacked' IRQ | ||
| 34 | * holds up an irq slot - in excessive cases (when multiple | ||
| 35 | * unexpected vectors occur) that might lock up the APIC | ||
| 36 | * completely. | ||
| 37 | * But don't ack when the APIC is disabled. -AK | ||
| 38 | */ | ||
| 39 | if (!disable_apic) | ||
| 40 | ack_APIC_irq(); | ||
| 41 | } | ||
| 42 | |||
| 23 | #ifdef CONFIG_DEBUG_STACKOVERFLOW | 43 | #ifdef CONFIG_DEBUG_STACKOVERFLOW |
| 24 | /* | 44 | /* |
| 25 | * Probabilistic stack overflow check: | 45 | * Probabilistic stack overflow check: |