evie/android_kernel_oneplus_msm8998
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Merge "genirq: honour default IRQ affinity setting during migration"

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Linux Build Service Account 2017-07-04 01:20:59 -07:00 • committed by Gerrit - the friendly Code Review server
commit 9081293223
1 changed files with 23 additions and 1 deletions
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24
kernel/irq/cpuhotplug.c
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@ -36,10 +36,32 @@ static bool migrate_one_irq(struct irq_desc *desc)
affinity = &available_cpus;
if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) {
/*
* The order of preference for selecting a fallback CPU is
*
* (1) online and un-isolated CPU from default affinity
* (2) online and un-isolated CPU
* (3) online CPU
*/
cpumask_andnot(&available_cpus, cpu_online_mask,
cpu_isolated_mask);
if (cpumask_empty(affinity))
if (cpumask_intersects(&available_cpus, irq_default_affinity))
cpumask_and(&available_cpus, &available_cpus,
irq_default_affinity);
else if (cpumask_empty(&available_cpus))
affinity = cpu_online_mask;
/*
* We are overriding the affinity with all online and
* un-isolated cpus. irq_set_affinity_locked() call
* below notify this mask to PM QOS affinity listener.
* That results in applying the CPU_DMA_LATENCY QOS
* to all the CPUs specified in the mask. But the low
* level irqchip driver sets the affinity of an irq
* to only one CPU. So pick only one CPU from the
* prepared mask while overriding the user affinity.
*/
affinity = cpumask_of(cpumask_any(affinity));
ret = true;
}