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ANDROID: irq/proc: use active cpus for allowed irq affinity

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With the introduction of pause, irqs should avoid
paused cpus.  Previously, when userspace set the
irq affinity, it was only filtered toward online cpus.
A cpu can be paused but online, and irqs should avoid.

Check the cpu_active_mask instead of the online mask
when writing the irq affinity, such that the subset
of cpus allowed doesn't include inactive cpus.

Bug: 161210528
Change-Id: I359a452cc97ad58ad85e9613a29d144ffcd51567
Signed-off-by: Stephen Dickey <dickey@codeaurora.org>
This commit is contained in:
Stephen Dickey
2021-01-05 15:07:28 -08:00
committed by Todd Kjos
parent ecd1443038
commit d9ffca8412
1 changed files with 2 additions and 2 deletions
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4
kernel/irq/proc.c
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@@ -157,9 +157,9 @@ static ssize_t write_irq_affinity(int type, struct file *file,
/*
* Do not allow disabling IRQs completely - it's a too easy
* way to make the system unusable accidentally :-) At least
* one online CPU still has to be targeted.
* one active CPU still has to be targeted.
*/
if (!cpumask_intersects(new_value, cpu_online_mask)) {
if (!cpumask_intersects(new_value, cpu_active_mask)) {
/*
* Special case for empty set - allow the architecture code
* to set default SMP affinity.