Commit-ID: 8f31a9845db348f5781df47ce04c79e4cfe90016
Gitweb: http://git.kernel.org/tip/8f31a9845db348f5781df47ce04c79e4cfe90016
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Tue, 20 Jun 2017 01:37:53 +0200
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Thu, 22 Jun 2017 18:21:25 +0200
genirq/cpuhotplug: Avoid irq affinity setting for single targets
Avoid trying to add a newly online CPU to the effective affinity mask of an
started up interrupt. That interrupt will either stay on the already online
CPU or move around for no value.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Keith Busch <keith.busch@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Link: http://lkml.kernel.org/r/20170619235447.431321047@xxxxxxxxxxxxx
---
kernel/irq/cpuhotplug.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/kernel/irq/cpuhotplug.c b/kernel/irq/cpuhotplug.c
index b7964e7..aee8f7e 100644
--- a/kernel/irq/cpuhotplug.c
+++ b/kernel/irq/cpuhotplug.c
@@ -148,9 +148,17 @@ static void irq_restore_affinity_of_irq(struct irq_desc *desc, unsigned int cpu)
!irq_data_get_irq_chip(data) || !cpumask_test_cpu(cpu, affinity))
return;
- if (irqd_is_managed_and_shutdown(data))
+ if (irqd_is_managed_and_shutdown(data)) {
irq_startup(desc, IRQ_RESEND, IRQ_START_COND);
- else
+ return;
+ }
+
+ /*
+ * If the interrupt can only be directed to a single target
+ * CPU then it is already assigned to a CPU in the affinity
+ * mask. No point in trying to move it around.
+ */
+ if (!irqd_is_single_target(data))
irq_set_affinity_locked(data, affinity, false);
}
--
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