linux-kernel - [PATCH v2 06/22] x86/acpi: Switch to irq_get_nr_irqs() and irq_set_nr

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Message-ID: <20241008202601.3737326-7-bvanassche@acm.org>
Date: Tue,  8 Oct 2024 13:25:45 -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>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	"Rafael J. Wysocki" <rafael@...nel.org>
Subject: [PATCH v2 06/22] x86/acpi: Switch to irq_get_nr_irqs() and irq_set_nr_irqs()

Use the irq_get_nr_irqs() and irq_set_nr_irqs() functions instead of the
global variable 'nr_irqs'. This patch prepares for changing 'nr_irqs' from
an exported global variable into a variable with file scope.

Cc: Ingo Molnar <mingo@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Rafael J. Wysocki <rafael@...nel.org>
Signed-off-by: Bart Van Assche <bvanassche@....org>
---
 arch/x86/kernel/acpi/boot.c   | 6 ++++--
 arch/x86/kernel/apic/vector.c | 8 ++++----
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 4efecac49863..3a44a9dc3fb7 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -1171,7 +1171,8 @@ static int __init acpi_parse_madt_ioapic_entries(void)
 	}
 
 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
-				      acpi_parse_int_src_ovr, nr_irqs);
+				      acpi_parse_int_src_ovr,
+				      irq_get_nr_irqs());
 	if (count < 0) {
 		pr_err("Error parsing interrupt source overrides entry\n");
 		/* TBD: Cleanup to allow fallback to MPS */
@@ -1191,7 +1192,8 @@ static int __init acpi_parse_madt_ioapic_entries(void)
 	mp_config_acpi_legacy_irqs();
 
 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
-				      acpi_parse_nmi_src, nr_irqs);
+				      acpi_parse_nmi_src,
+				      irq_get_nr_irqs());
 	if (count < 0) {
 		pr_err("Error parsing NMI SRC entry\n");
 		/* TBD: Cleanup to allow fallback to MPS */
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index 557318145038..736f62812f5c 100644
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -712,8 +712,8 @@ int __init arch_probe_nr_irqs(void)
 {
 	int nr;
 
-	if (nr_irqs > (NR_VECTORS * nr_cpu_ids))
-		nr_irqs = NR_VECTORS * nr_cpu_ids;
+	if (irq_get_nr_irqs() > NR_VECTORS * nr_cpu_ids)
+		irq_set_nr_irqs(NR_VECTORS * nr_cpu_ids);
 
 	nr = (gsi_top + nr_legacy_irqs()) + 8 * nr_cpu_ids;
 #if defined(CONFIG_PCI_MSI)
@@ -725,8 +725,8 @@ int __init arch_probe_nr_irqs(void)
 	else
 		nr += gsi_top * 16;
 #endif
-	if (nr < nr_irqs)
-		nr_irqs = nr;
+	if (nr < irq_get_nr_irqs())
+		irq_set_nr_irqs(nr);
 
 	/*
 	 * We don't know if PIC is present at this point so we need to do