Mailing List Archive

The following commit has been merged into the irq/core branch of tip:

Commit-ID: a7fb69ffd7ce438a259b2f9fbcebc62f5caf2d4f
Gitweb: https://git.kernel.org/tip/a7fb69ffd7ce438a259b2f9fbcebc62f5caf2d4f
Author: Dawei Li <dawei.li@shingroup.cn>
AuthorDate: Tue, 16 Apr 2024 16:54:53 +08:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Wed, 24 Apr 2024 21:23:49 +02:00

irqchip/sifive-plic: 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.

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/20240416085454.3547175-7-dawei.li@shingroup.cn

---
drivers/irqchip/irq-sifive-plic.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
index f3d4cb9..8fb183c 100644
--- a/drivers/irqchip/irq-sifive-plic.c
+++ b/drivers/irqchip/irq-sifive-plic.c
@@ -164,15 +164,12 @@ static int plic_set_affinity(struct irq_data *d,
const struct cpumask *mask_val, bool force)
{
unsigned int cpu;
- struct cpumask amask;
struct plic_priv *priv = irq_data_get_irq_chip_data(d);

- cpumask_and(&amask, &priv->lmask, mask_val);
-
if (force)
- cpu = cpumask_first(&amask);
+ cpu = cpumask_first_and(&priv->lmask, mask_val);
else
- cpu = cpumask_any_and(&amask, cpu_online_mask);
+ cpu = cpumask_first_and_and(&priv->lmask, mask_val, cpu_online_mask);

if (cpu >= nr_cpu_ids)
return -EINVAL;