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irqchip/riscv-aplic-direct: Avoid explicit cpumask allocation on stack

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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.

Use cpumask_first_and_and() to avoid the need for a temporary cpumask on
the stack.

Signed-off-by: Dawei Li <dawei.li@shingroup.cn>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20240416085454.3547175-6-dawei.li@shingroup.cn
This commit is contained in:
Dawei Li 2024-04-16 16:54:52 +08:00 committed by Thomas Gleixner
parent 2bc32db5a2
commit 5d650d1eba
1 changed files with 2 additions and 5 deletions
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7
drivers/irqchip/irq-riscv-aplic-direct.c
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@ -54,15 +54,12 @@ static int aplic_direct_set_affinity(struct irq_data *d, const struct cpumask *m
struct aplic_direct *direct = container_of(priv, struct aplic_direct, priv);
struct aplic_idc *idc;
unsigned int cpu, val;
struct cpumask amask;
void __iomem *target;
cpumask_and(&amask, &direct->lmask, mask_val);
if (force)
cpu = cpumask_first(&amask);
cpu = cpumask_first_and(&direct->lmask, mask_val);
else
cpu = cpumask_any_and(&amask, cpu_online_mask);
cpu = cpumask_first_and_and(&direct->lmask, mask_val, cpu_online_mask);
if (cpu >= nr_cpu_ids)
return -EINVAL;