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genirq/cpuhotplug: Avoid irq affinity setting for single targets

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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@linutronix.de>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Christoph Hellwig <hch@lst.de>
Link: http://lkml.kernel.org/r/20170619235447.431321047@linutronix.de
This commit is contained in:
Thomas Gleixner 2017-06-20 01:37:53 +02:00
parent d52dd44175
commit 8f31a9845d
1 changed files with 10 additions and 2 deletions
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12
kernel/irq/cpuhotplug.c
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@ -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);
}