linux-kernel - [PATCH v4 3/5] sparc/of: Remove on-stack cpumask var

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Date: Wed, 24 Apr 2024 10:55:46 +0800
From: Dawei Li <dawei.li@...ngroup.cn>
To: davem@...emloft.net,
	andreas@...sler.com
Cc: sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	sam@...nborg.org,
	Dawei Li <dawei.li@...ngroup.cn>
Subject: [PATCH v4 3/5] sparc/of: Remove on-stack cpumask var

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.

@cpumask of irq_set_affinity() is read-only and free of change, drop
unneeded cpumask var.

Reviewed-by: Sam Ravnborg <sam@...nborg.org>
Signed-off-by: Dawei Li <dawei.li@...ngroup.cn>
---
 arch/sparc/kernel/of_device_64.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/sparc/kernel/of_device_64.c b/arch/sparc/kernel/of_device_64.c
index c350c58c7f69..f98c2901f335 100644
--- a/arch/sparc/kernel/of_device_64.c
+++ b/arch/sparc/kernel/of_device_64.c
@@ -624,10 +624,7 @@ static unsigned int __init build_one_device_irq(struct platform_device *op,
 out:
 	nid = of_node_to_nid(dp);
 	if (nid != -1) {
-		cpumask_t numa_mask;
-
-		cpumask_copy(&numa_mask, cpumask_of_node(nid));
-		irq_set_affinity(irq, &numa_mask);
+		irq_set_affinity(irq, cpumask_of_node(nid));
 	}
 
 	return irq;
-- 
2.27.0