diff options
| author | Eric W. Biederman <ebiederm@xmission.com> | 2007-03-07 14:23:54 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-03-09 10:50:33 -0800 |
| commit | 3baa43fdc9b64646b468b92936c4842c51b9e2ed (patch) | |
| tree | 0a004d203f41f46cc7a1ace9c2eb1dbd81bdfde0 | |
| parent | 7670279989a552a7a8afd275368d55a4f3b5054b (diff) | |
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>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
| -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(); |