Received-SPF: pass (google.com: domain of linux-kernel+bounces-152147-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:4601:e00::3 as permitted sender) client-ip=2604:1380:4601:e00::3;
From: Dawei Li <dawei.li@shingroup.cn>
To: davem@davemloft.net,
	andreas@gaisler.com
Cc: sparclinux@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	sam@ravnborg.org,
	Dawei Li <dawei.li@shingroup.cn>
Subject: [PATCH v2 4/7] sparc/pci_msi: Remove on-stack cpumask var
Date: Sat, 20 Apr 2024 13:15:44 +0800
Message-Id: <20240420051547.3681642-5-dawei.li@shingroup.cn>
In-Reply-To: <20240420051547.3681642-1-dawei.li@shingroup.cn>
References: <20240420051547.3681642-1-dawei.li@shingroup.cn>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Feedback-ID: bizesmtp:shingroup.cn:qybglogicsvrgz:qybglogicsvrgz5a-1

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.

Signed-off-by: Dawei Li <dawei.li@shingroup.cn>
---
 arch/sparc/kernel/pci_msi.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/sparc/kernel/pci_msi.c b/arch/sparc/kernel/pci_msi.c
index fc7402948b7b..acb2f83a1d5c 100644
--- a/arch/sparc/kernel/pci_msi.c
+++ b/arch/sparc/kernel/pci_msi.c
@@ -287,10 +287,7 @@ static int bringup_one_msi_queue(struct pci_pbm_info *pbm,
 
 	nid = pbm->numa_node;
 	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));
 	}
 	err = request_irq(irq, sparc64_msiq_interrupt, 0,
 			  "MSIQ",
-- 
2.27.0