[patch V5 20/38] x86/irq/64: Provide handle_irq()

[Thomas Gleixner]

To consolidate the interrupt entry/exit code vs. the other exceptions
provide handle_irq() (similar to 32bit) to move the interrupt stack
switching to C code. That allows to consolidate the entry exit handling by
reusing the idtentry machinery both in ASM and C.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
V5: Use the reworked ASM switcheroo
---
 arch/x86/kernel/irq_64.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/arch/x86/kernel/irq_64.c
+++ b/arch/x86/kernel/irq_64.c
@@ -79,3 +79,11 @@ void do_softirq_own_stack(void)
 	else
 		run_on_irqstack(__do_softirq, NULL);
 }
+
+void handle_irq(struct irq_desc *desc, struct pt_regs *regs)
+{
+	if (!irq_needs_irq_stack(regs))
+		generic_handle_irq_desc(desc);
+	else
+		run_on_irqstack(desc->handle_irq, desc);
+}