[tip:irq/core] genirq/cpuhotplug: Do not migrated shutdown irqs

[tip-bot for Thomas Gleixner]

Commit-ID:  91f26cb4cd3c22bd656ab46c49329aacaaab5504
Gitweb: http://git.kernel.org/tip/91f26cb4cd3c22bd656ab46c49329aacaaab5504
Author: Thomas Gleixner 
AuthorDate: Tue, 20 Jun 2017 01:37:28 +0200
Committer:  Thomas Gleixner 
CommitDate: Thu, 22 Jun 2017 18:21:17 +0200

genirq/cpuhotplug: Do not migrated shutdown irqs

Interrupts, which are shut down are tried to be migrated as well. That's
pointless because the interrupt cannot fire and the next startup will move
it to the proper place anyway.

Signed-off-by: Thomas Gleixner 
Cc: Jens Axboe 
Cc: Marc Zyngier 
Cc: Michael Ellerman 
Cc: Keith Busch 
Cc: Peter Zijlstra 
Cc: Christoph Hellwig 
Link: http://lkml.kernel.org/r/20170619235445.447550...@linutronix.de

---
 kernel/irq/cpuhotplug.c | 11 ---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/kernel/irq/cpuhotplug.c b/kernel/irq/cpuhotplug.c
index 41fe1e0..09b20e1 100644
--- a/kernel/irq/cpuhotplug.c
+++ b/kernel/irq/cpuhotplug.c
@@ -33,10 +33,15 @@ static bool migrate_one_irq(struct irq_desc *desc)
}
 
/*
-* If this is a per-CPU interrupt, or the affinity does not
-* include this CPU, then we have nothing to do.
+* No move required, if:
+* - Interrupt is per cpu
+* - Interrupt is not started
+* - Affinity mask does not include this CPU.
+*
+* Note: Do not check desc->action as this might be a chained
+* interrupt.
 */
-   if (irqd_is_per_cpu(d) ||
+   if (irqd_is_per_cpu(d) || !irqd_is_started(d) ||
!cpumask_test_cpu(smp_processor_id(), affinity))
return false;
 

[tip:irq/core] genirq/cpuhotplug: Do not migrated shutdown irqs

[tip-bot for Thomas Gleixner]

Commit-ID:  91f26cb4cd3c22bd656ab46c49329aacaaab5504
Gitweb: http://git.kernel.org/tip/91f26cb4cd3c22bd656ab46c49329aacaaab5504
Author: Thomas Gleixner 
AuthorDate: Tue, 20 Jun 2017 01:37:28 +0200
Committer:  Thomas Gleixner 
CommitDate: Thu, 22 Jun 2017 18:21:17 +0200

genirq/cpuhotplug: Do not migrated shutdown irqs

Interrupts, which are shut down are tried to be migrated as well. That's
pointless because the interrupt cannot fire and the next startup will move
it to the proper place anyway.

Signed-off-by: Thomas Gleixner 
Cc: Jens Axboe 
Cc: Marc Zyngier 
Cc: Michael Ellerman 
Cc: Keith Busch 
Cc: Peter Zijlstra 
Cc: Christoph Hellwig 
Link: http://lkml.kernel.org/r/20170619235445.447550...@linutronix.de

---
 kernel/irq/cpuhotplug.c | 11 ---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/kernel/irq/cpuhotplug.c b/kernel/irq/cpuhotplug.c
index 41fe1e0..09b20e1 100644
--- a/kernel/irq/cpuhotplug.c
+++ b/kernel/irq/cpuhotplug.c
@@ -33,10 +33,15 @@ static bool migrate_one_irq(struct irq_desc *desc)
}
 
/*
-* If this is a per-CPU interrupt, or the affinity does not
-* include this CPU, then we have nothing to do.
+* No move required, if:
+* - Interrupt is per cpu
+* - Interrupt is not started
+* - Affinity mask does not include this CPU.
+*
+* Note: Do not check desc->action as this might be a chained
+* interrupt.
 */
-   if (irqd_is_per_cpu(d) ||
+   if (irqd_is_per_cpu(d) || !irqd_is_started(d) ||
!cpumask_test_cpu(smp_processor_id(), affinity))
return false;