request_irq() is preferred over setup_irq(). Invocations of setup_irq()
occur after memory allocators are ready.
Per tglx[1], setup_irq() existed in olden days when allocators were not
ready by the time early interrupts were initialized.
Hence replace setup_irq() by request_irq().
[1] https://lkml.kernel.org/r/alpine.DEB.2.20.1710191609480.1971@nanos
Signed-off-by: afzal mohammed <[email protected]>
---
v3:
* Instead of tree wide series, arch specific patch
* Strip irrelevant portions & more tweaking in commit message
* Remove name indirection in pr_err string & modify to the form
"Failed to request irq 2 (cascade)\n"
* Use local variable for flags to improve readability
v2:
* Replace pr_err("request_irq() on %s failed" by
pr_err("%s: request_irq() failed"
* Commit message massage
arch/x86/kernel/irqinit.c | 18 +++++++-----------
arch/x86/kernel/time.c | 10 +++-------
2 files changed, 10 insertions(+), 18 deletions(-)
diff --git a/arch/x86/kernel/irqinit.c b/arch/x86/kernel/irqinit.c
index 16919a9671fa..d750178fc192 100644
--- a/arch/x86/kernel/irqinit.c
+++ b/arch/x86/kernel/irqinit.c
@@ -44,15 +44,6 @@
* (these are usually mapped into the 0x30-0xff vector range)
*/
-/*
- * IRQ2 is cascade interrupt to second interrupt controller
- */
-static struct irqaction irq2 = {
- .handler = no_action,
- .name = "cascade",
- .flags = IRQF_NO_THREAD,
-};
-
DEFINE_PER_CPU(vector_irq_t, vector_irq) = {
[0 ... NR_VECTORS - 1] = VECTOR_UNUSED,
};
@@ -104,6 +95,11 @@ void __init native_init_IRQ(void)
idt_setup_apic_and_irq_gates();
lapic_assign_system_vectors();
- if (!acpi_ioapic && !of_ioapic && nr_legacy_irqs())
- setup_irq(2, &irq2);
+ if (!acpi_ioapic && !of_ioapic && nr_legacy_irqs()) {
+ /*
+ * IRQ2 is cascade interrupt to second interrupt controller
+ */
+ if (request_irq(2, no_action, IRQF_NO_THREAD, "cascade", NULL))
+ pr_err("Failed to request irq 2 (cascade)\n");
+ }
}
diff --git a/arch/x86/kernel/time.c b/arch/x86/kernel/time.c
index d8673d8a779b..6acc1baa4a52 100644
--- a/arch/x86/kernel/time.c
+++ b/arch/x86/kernel/time.c
@@ -62,19 +62,15 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
-static struct irqaction irq0 = {
- .handler = timer_interrupt,
- .flags = IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
- .name = "timer"
-};
-
static void __init setup_default_timer_irq(void)
{
+ unsigned long flags = IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER;
+
/*
* Unconditionally register the legacy timer; even without legacy
* PIC/PIT we need this for the HPET0 in legacy replacement mode.
*/
- if (setup_irq(0, &irq0))
+ if (request_irq(0, timer_interrupt, flags, "timer", NULL))
pr_info("Failed to register legacy timer interrupt\n");
}
--
2.25.1