Commit-ID: 8d966a04107e56993a051cd41ead0b4f23ba2414
Gitweb: http://git.kernel.org/tip/8d966a04107e56993a051cd41ead0b4f23ba2414
Author: Fenghua Yu <fenghua.yu@xxxxxxxxx>
AuthorDate: Tue, 13 Nov 2012 11:32:49 -0800
Committer: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
CommitDate: Wed, 14 Nov 2012 15:28:11 -0800
x86, hotplug: Handle retrigger irq by the first available CPU
The first cpu in irq cfg->domain is likely to be CPU 0 and may not be available
when CPU 0 is offline. Instead of using CPU 0 to handle retriggered irq, we use
first available CPU which is online and in this irq's domain.
Signed-off-by: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1352835171-3958-13-git-send-email-fenghua.yu@xxxxxxxxx
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
---
arch/x86/kernel/apic/io_apic.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 1817fa9..f78fc2b 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2199,9 +2199,11 @@ static int ioapic_retrigger_irq(struct irq_data *data)
{
struct irq_cfg *cfg = data->chip_data;
unsigned long flags;
+ int cpu;
raw_spin_lock_irqsave(&vector_lock, flags);
- apic->send_IPI_mask(cpumask_of(cpumask_first(cfg->domain)), cfg->vector);
+ cpu = cpumask_first_and(cfg->domain, cpu_online_mask);
+ apic->send_IPI_mask(cpumask_of(cpu), cfg->vector);
raw_spin_unlock_irqrestore(&vector_lock, flags);
return 1;
--
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