x86/kernel/irq_64.c

1 // SPDX-License-Identifier: GPL-2.0
5  * This file contains the lowest level x86_64-specific interrupt
8  * x86_64-specific irq controller code. (e.g. i8259.c and
34  * VMAP the backing store with guard pages
39 	struct page *pages[IRQ_STACK_SIZE / PAGE_SIZE];  in map_irq_stack()  local
46 		pages[i] = pfn_to_page(pa >> PAGE_SHIFT);  in map_irq_stack()
49 	va = vmap(pages, IRQ_STACK_SIZE / PAGE_SIZE, VM_MAP, PAGE_KERNEL);  in map_irq_stack()
51 		return -ENOMEM;  in map_irq_stack()
54 	per_cpu(hardirq_stack_ptr, cpu) = va + IRQ_STACK_SIZE - 8;  in map_irq_stack()
59  * If VMAP stacks are disabled due to KASAN, just use the per cpu
60  * backing store without guard pages.
67 	per_cpu(hardirq_stack_ptr, cpu) = va + IRQ_STACK_SIZE - 8;  in map_irq_stack()