linux-kernel - [PATCH 4/5] genirq: Use the common function irq_expand_nr

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Message-ID: <20230130005725.3517597-5-sdonthineni@nvidia.com>
Date:   Sun, 29 Jan 2023 18:57:24 -0600
From:   Shanker Donthineni <sdonthineni@...dia.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>, Michael Walle <michael@...le.cc>
CC:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Hans de Goede <hdegoede@...hat.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Shanker Donthineni <sdonthineni@...dia.com>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 4/5] genirq: Use the common function irq_expand_nr_irqs()

When the !SPARSEIRQ code path is executed, the function
irq_expand_nr_irqs() returns -ENOMEM. However, the SPARSEIRQ
version of the function can be safely used in both cases, as
nr_irqs = MAX_SPARSE_IRQS = NR_IRQS.

Signed-off-by: Shanker Donthineni <sdonthineni@...dia.com>
---
 kernel/irq/irqdesc.c | 21 ++++++++-------------
 1 file changed, 8 insertions(+), 13 deletions(-)

diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index aacfb4826c5e..247a0718d028 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -144,6 +144,14 @@ static unsigned int irq_find_next_irq(unsigned int offset)
 	return find_next_bit(allocated_irqs, nr_irqs, offset);
 }
 
+static int irq_expand_nr_irqs(unsigned int nr)
+{
+	if (nr > MAX_SPARSE_IRQS)
+		return -ENOMEM;
+	nr_irqs = nr;
+	return 0;
+}
+
 #ifdef CONFIG_SPARSE_IRQ
 
 static void irq_kobj_release(struct kobject *kobj);
@@ -528,14 +536,6 @@ static int alloc_descs(unsigned int start, unsigned int cnt, int node,
 	return -ENOMEM;
 }
 
-static int irq_expand_nr_irqs(unsigned int nr)
-{
-	if (nr > MAX_SPARSE_IRQS)
-		return -ENOMEM;
-	nr_irqs = nr;
-	return 0;
-}
-
 int __init early_irq_init(void)
 {
 	int i, initcnt, node = first_online_node;
@@ -630,11 +630,6 @@ static inline int alloc_descs(unsigned int start, unsigned int cnt, int node,
 	return start;
 }
 
-static int irq_expand_nr_irqs(unsigned int nr)
-{
-	return -ENOMEM;
-}
-
 void irq_mark_irq(unsigned int irq)
 {
 	mutex_lock(&sparse_irq_lock);
-- 
2.25.1