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kernel: Only set one CPU in the default IRQ affinity mask

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On ARM, IRQs are executed on the first CPU inside the affinity mask, so
setting an affinity mask with more than one CPU set is deceptive and
causes issues with pm_qos. To fix this, only set the CPU0 bit inside the
affinity mask, since that's where IRQs will run by default.

This is a follow-up to "kernel: Don't allow IRQ affinity masks to have
more than one CPU".

Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com>
This commit is contained in:
Sultan Alsawaf 2020-08-14 20:11:38 -07:00 committed by spakkkk
parent 6e31237cf3
commit 0f86af590b
1 changed files with 1 additions and 1 deletions
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2
kernel/irq/irqdesc.c
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@ -43,7 +43,7 @@ static void __init init_irq_default_affinity(void)
if (!cpumask_available(irq_default_affinity))
zalloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT);
if (cpumask_empty(irq_default_affinity))
cpumask_setall(irq_default_affinity);
cpumask_set_cpu(0, irq_default_affinity);
}
#else
static void __init init_irq_default_affinity(void)