powerpc/32: Use vmapped stacks for interrupts (547db12f) · Commits · 戴 / test

arch/powerpc/kernel/irq.c

+22 −0

Original line number	Diff line number	Diff line
		@@ -50,6 +50,7 @@
		#include <linux/debugfs.h>
		#include <linux/of.h>
		#include <linux/of_irq.h>
		#include <linux/vmalloc.h>

		#include <linux/uaccess.h>
		#include <asm/io.h>
		@@ -664,8 +665,29 @@ void do_IRQ(struct pt_regs *regs)
		set_irq_regs(old_regs);
		}

		static void *__init alloc_vm_stack(void)
		{
		return __vmalloc_node_range(THREAD_SIZE, THREAD_ALIGN, VMALLOC_START,
		VMALLOC_END, THREADINFO_GFP, PAGE_KERNEL,
		0, NUMA_NO_NODE, (void*)_RET_IP_);
		}

		static void __init vmap_irqstack_init(void)
		{
		int i;

		for_each_possible_cpu(i) {
		softirq_ctx[i] = alloc_vm_stack();
		hardirq_ctx[i] = alloc_vm_stack();
		}
		}


		void __init init_IRQ(void)
		{
		if (IS_ENABLED(CONFIG_VMAP_STACK))
		vmap_irqstack_init();

		if (ppc_md.init_IRQ)
		ppc_md.init_IRQ();
		}

+3 −0

Original line number	Diff line number	Diff line
		@@ -153,6 +153,9 @@ void __init irqstack_early_init(void)
		{
		unsigned int i;

		if (IS_ENABLED(CONFIG_VMAP_STACK))
		return;

		/* interrupt stacks must be in lowmem, we get that for free on ppc32
		* as the memblock is limited to lowmem by default */
		for_each_possible_cpu(i) {