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| author | Eric W. Biederman <ebiederm@xmission.com> | 2007-02-13 13:26:25 +0100 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2007-02-13 13:26:25 +0100 |
| commit | 2fb12a9bca5ad9aa6dcd2c639b4a7656a8843ef8 (patch) | |
| tree | cf83dc4fba430aa8ecd542ef86b29a68d938ba83 /arch/x86_64/kernel/irq.c | |
| parent | bcde1ebb81c51ebdfa02887703e4d21c1bbc2431 (diff) | |
| download | linux-2fb12a9bca5ad9aa6dcd2c639b4a7656a8843ef8.tar.gz | |
[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/x86_64/kernel/irq.c')
| -rw-r--r-- | arch/x86_64/kernel/irq.c | 12 |
1 files 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 <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(); |