From 3baa43fdc9b64646b468b92936c4842c51b9e2ed Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Wed, 7 Mar 2007 14:23:54 -0500 Subject: [PATCH] x86-64: survive having no irq mapping for a vector Occasionally the kernel has bugs that result in no irq being found for a given cpu vector. If we acknowledge the irq the system has a good chance of continuing even though we dropped an irq message. If we continue to simply print a message and not acknowledge the irq the system is likely to become non-responsive shortly there after. AK: Fixed compilation for UP kernels Signed-off-by: Eric W. Biederman Signed-off-by: Andi Kleen Cc: "Luigi Genoni" Cc: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Chris Wright --- arch/x86_64/kernel/irq.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/arch/x86_64/kernel/irq.c b/arch/x86_64/kernel/irq.c index 0c06af6c13bc..3bc30d2c13d3 100644 --- a/arch/x86_64/kernel/irq.c +++ b/arch/x86_64/kernel/irq.c @@ -18,6 +18,7 @@ #include #include #include +#include atomic_t irq_err_count; @@ -120,9 +121,14 @@ asmlinkage unsigned int do_IRQ(struct pt_regs *regs) if (likely(irq < NR_IRQS)) generic_handle_irq(irq); - else if (printk_ratelimit()) - printk(KERN_EMERG "%s: %d.%d No irq handler for vector\n", - __func__, smp_processor_id(), vector); + else { + if (!disable_apic) + ack_APIC_irq(); + + if (printk_ratelimit()) + printk(KERN_EMERG "%s: %d.%d No irq handler for vector\n", + __func__, smp_processor_id(), vector); + } irq_exit(); -- 2.39.5