diff options
| author | Dawei Li <dawei.li@shingroup.cn> | 2024-04-16 16:54:50 +0800 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2024-04-24 21:23:49 +0200 |
| commit | fcb8af4cbcd122e33ceeadd347b8866d32035af7 (patch) | |
| tree | 424135c411a55a76f1b45877a8558225994b970d /drivers/irqchip | |
| parent | 6a9a52f74e3b82ff3f5398810c1b23ad497e2df5 (diff) | |
| download | linux-stable-fcb8af4cbcd122e33ceeadd347b8866d32035af7.tar.gz linux-stable-fcb8af4cbcd122e33ceeadd347b8866d32035af7.tar.bz2 linux-stable-fcb8af4cbcd122e33ceeadd347b8866d32035af7.zip | |
irqchip/gic-v3-its: Avoid explicit cpumask allocation on stack
In general it's preferable to avoid placing cpumasks on the stack, as
for large values of NR_CPUS these can consume significant amounts of
stack space and make stack overflows more likely.
Remove cpumask var on stack and use cpumask_any_and() to address it.
Signed-off-by: Dawei Li <dawei.li@shingroup.cn>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240416085454.3547175-4-dawei.li@shingroup.cn
Diffstat (limited to 'drivers/irqchip')
| -rw-r--r-- | drivers/irqchip/irq-gic-v3-its.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index fca888b36680..20f954211c61 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -3826,9 +3826,9 @@ static int its_vpe_set_affinity(struct irq_data *d, bool force) { struct its_vpe *vpe = irq_data_get_irq_chip_data(d); - struct cpumask common, *table_mask; + unsigned int from, cpu = nr_cpu_ids; + struct cpumask *table_mask; unsigned long flags; - int from, cpu; /* * Changing affinity is mega expensive, so let's be as lazy as @@ -3850,10 +3850,15 @@ static int its_vpe_set_affinity(struct irq_data *d, * If we are offered another CPU in the same GICv4.1 ITS * affinity, pick this one. Otherwise, any CPU will do. */ - if (table_mask && cpumask_and(&common, mask_val, table_mask)) - cpu = cpumask_test_cpu(from, &common) ? from : cpumask_first(&common); - else + if (table_mask) + cpu = cpumask_any_and(mask_val, table_mask); + if (cpu < nr_cpu_ids) { + if (cpumask_test_cpu(from, mask_val) && + cpumask_test_cpu(from, table_mask)) + cpu = from; + } else { cpu = cpumask_first(mask_val); + } if (from == cpu) goto out; |