diff options
| author | Pavankumar Kondeti <pkondeti@codeaurora.org> | 2017-06-22 13:33:08 +0530 |
|---|---|---|
| committer | Pavankumar Kondeti <pkondeti@codeaurora.org> | 2017-06-30 10:41:00 +0530 |
| commit | cd6d19b8e42cfef81a1ee3c4e4367295e8025024 (patch) | |
| tree | 808fa78140734a20bf72bc71e91187f228d2a409 /kernel/irq | |
| parent | 76aa496f898a16266be01a1543797804d4baa149 (diff) | |
genriq: pick only one CPU while overriding the affinity during migration
With commit bfc60d474137 ("genirq: Use irq_set_affinity_locked to change
irq affinity"), affinity listeners receive the notification when the irq
affinity is changed during migration. If there is no online and
un-isolated CPU available from the user specified affinity, the affinity
is overridden with all online and un-isolated CPUs. The same cpumask is
notified to PM QOS affinity listener which applies PM_QOS_CPU_DMA_LATENCY
vote to all those CPUs. As the low level irqchip driver sets affinity to
only one CPU, do the same while overriding the affinity during migration.
Change-Id: I0bcb75dd356658da100fbeeefd33ef8b121f4d6d
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Diffstat (limited to 'kernel/irq')
| -rw-r--r-- | kernel/irq/cpuhotplug.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/irq/cpuhotplug.c b/kernel/irq/cpuhotplug.c index 6c8e154c7384..3dc1dbd9c166 100644 --- a/kernel/irq/cpuhotplug.c +++ b/kernel/irq/cpuhotplug.c @@ -40,6 +40,17 @@ static bool migrate_one_irq(struct irq_desc *desc) cpu_isolated_mask); if (cpumask_empty(affinity)) 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; } |