linux-kernel - [PATCH 01/21] genirq: Introduce number_of_interrupts() and set_number_of

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Message-ID: <20240930181600.1684198-2-bvanassche@acm.org>
Date: Mon, 30 Sep 2024 11:15:40 -0700
From: Bart Van Assche <bvanassche@....org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Russell King <linux@...linux.org.uk>,
	linux-kernel@...r.kernel.org,
	Bart Van Assche <bvanassche@....org>
Subject: [PATCH 01/21] genirq: Introduce number_of_interrupts() and set_number_of_interrupts()

This patch prepares for changing 'nr_irqs' from an exported global variable
into a variable with file scope.

Signed-off-by: Bart Van Assche <bvanassche@....org>
---
 include/linux/irqnr.h |  2 ++
 kernel/irq/irqdesc.c  | 14 ++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/include/linux/irqnr.h b/include/linux/irqnr.h
index 3496baa0b07f..a8b2cb6146e8 100644
--- a/include/linux/irqnr.h
+++ b/include/linux/irqnr.h
@@ -6,6 +6,8 @@
 
 
 extern int nr_irqs;
+int number_of_interrupts(void) __pure;
+int set_number_of_interrupts(int nr);
 extern struct irq_desc *irq_to_desc(unsigned int irq);
 unsigned int irq_get_next_irq(unsigned int offset);
 
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 1dee88ba0ae4..8c6280843964 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -141,6 +141,20 @@ static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node,
 int nr_irqs = NR_IRQS;
 EXPORT_SYMBOL_GPL(nr_irqs);
 
+int number_of_interrupts(void)
+{
+	return nr_irqs;
+}
+EXPORT_SYMBOL_GPL(number_of_interrupts);
+
+int set_number_of_interrupts(int nr)
+{
+	nr_irqs = nr;
+
+	return nr;
+}
+EXPORT_SYMBOL_GPL(set_number_of_interrupts);
+
 static DEFINE_MUTEX(sparse_irq_lock);
 static struct maple_tree sparse_irqs = MTREE_INIT_EXT(sparse_irqs,
 					MT_FLAGS_ALLOC_RANGE |