leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

x86, hotplug: Handle retrigger irq by the first available CPU

Browse Source 
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@intel.com>
Link: http://lkml.kernel.org/r/1352835171-3958-13-git-send-email-fenghua.yu@intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Fenghua Yu
2012-11-13 11:32:49 -08:00
committed by H. Peter Anvin
parent 30242aa602
commit 8d966a0410
1 changed files with 3 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/kernel/apic/io_apic.c
View File

@@ -2199,9 +2199,11 @@ static int ioapic_retrigger_irq(struct irq_data *data)
{ {
struct irq_cfg *cfg = data->chip_data; struct irq_cfg *cfg = data->chip_data;
unsigned long flags; unsigned long flags;
int cpu;
raw_spin_lock_irqsave(&vector_lock, flags); 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); raw_spin_unlock_irqrestore(&vector_lock, flags);
return 1; return 1;