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authorEric W. Biederman <ebiederm@xmission.com>2007-02-13 13:26:25 +0100
committerAndi Kleen <andi@basil.nowhere.org>2007-02-13 13:26:25 +0100
commit2fb12a9bca5ad9aa6dcd2c639b4a7656a8843ef8 (patch)
treecf83dc4fba430aa8ecd542ef86b29a68d938ba83 /arch
parentbcde1ebb81c51ebdfa02887703e4d21c1bbc2431 (diff)
[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 <ebiederm@xmission.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: "Luigi Genoni" <luigi.genoni@pirelli.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86_64/kernel/irq.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/arch/x86_64/kernel/irq.c b/arch/x86_64/kernel/irq.c
index 0c06af6c13b..3bc30d2c13d 100644
--- a/arch/x86_64/kernel/irq.c
+++ b/arch/x86_64/kernel/irq.c
@@ -18,6 +18,7 @@
#include <asm/uaccess.h>
#include <asm/io_apic.h>
#include <asm/idle.h>
+#include <asm/smp.h>
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();