Merge tag 'x86-apic-2025-12-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 apic updates from Ingo Molnar:

 - x86/apic: Fix the frequency in apic=verbose log output (Julian
   Stecklina)

 - Simplify mp_irqdomain_alloc() slightly (Christophe JAILLET)

* tag 'x86-apic-2025-12-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/apic: Fix frequency in apic=verbose log output
  x86/ioapic: Simplify mp_irqdomain_alloc() slightly

2 files changed, 10 insertions, 7 deletions

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 680d305589a3..ca1c8b70ac44 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -173,6 +173,7 @@ static struct resource lapic_resource = {
 	.flags = IORESOURCE_MEM | IORESOURCE_BUSY,
 };
 
+/* Measured in ticks per HZ. */
 unsigned int lapic_timer_period = 0;
 
 static void apic_pm_activate(void);
@@ -792,6 +793,7 @@ static int __init calibrate_APIC_clock(void)
 {
 	struct clock_event_device *levt = this_cpu_ptr(&lapic_events);
 	u64 tsc_perj = 0, tsc_start = 0;
+	long delta_tsc_khz, bus_khz;
 	unsigned long jif_start;
 	unsigned long deltaj;
 	long delta, deltatsc;
@@ -894,14 +896,15 @@ static int __init calibrate_APIC_clock(void)
 	apic_pr_verbose("..... calibration result: %u\n", lapic_timer_period);
 
 	if (boot_cpu_has(X86_FEATURE_TSC)) {
-		apic_pr_verbose("..... CPU clock speed is %ld.%04ld MHz.\n",
-				(deltatsc / LAPIC_CAL_LOOPS) / (1000000 / HZ),
-				(deltatsc / LAPIC_CAL_LOOPS) % (1000000 / HZ));
+		delta_tsc_khz = (deltatsc * HZ) / (1000 * LAPIC_CAL_LOOPS);
+
+		apic_pr_verbose("..... CPU clock speed is %ld.%03ld MHz.\n",
+				delta_tsc_khz / 1000, delta_tsc_khz % 1000);
 	}
 
-	apic_pr_verbose("..... host bus clock speed is %u.%04u MHz.\n",
-			lapic_timer_period / (1000000 / HZ),
-			lapic_timer_period % (1000000 / HZ));
+	bus_khz = (long)lapic_timer_period * HZ / 1000;
+	apic_pr_verbose("..... host bus clock speed is %ld.%03ld MHz.\n",
+			bus_khz / 1000, bus_khz % 1000);
 
 	/*
 	 * Do a sanity check on the APIC calibration result
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 5ba2feb2c04c..1e0442e867b1 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2864,7 +2864,7 @@ int mp_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
 
 	ioapic = mp_irqdomain_ioapic_idx(domain);
 	pin = info->ioapic.pin;
-	if (irq_find_mapping(domain, (irq_hw_number_t)pin) > 0)
+	if (irq_resolve_mapping(domain, (irq_hw_number_t)pin))
 		return -EEXIST;
 
 	data = kzalloc(sizeof(*data), GFP_KERNEL);