patch-2.4.20 linux-2.4.20/arch/i386/kernel/irq.c

• Lines: 21
• Date: Thu Nov 28 15:53:09 2002
• Orig file: linux-2.4.19/arch/i386/kernel/irq.c
• Orig date: Thu Oct 25 13:53:46 2001

diff -urN linux-2.4.19/arch/i386/kernel/irq.c linux-2.4.20/arch/i386/kernel/irq.c
@@ -577,6 +577,20 @@
 	irq_desc_t *desc = irq_desc + irq;
 	struct irqaction * action;
 	unsigned int status;
+#ifdef CONFIG_DEBUG_STACKOVERFLOW
+	long esp;
+
+	/* Debugging check for stack overflow: is there less than 1KB free? */
+	__asm__ __volatile__("andl %%esp,%0" : "=r" (esp) : "0" (8191));
+	if (unlikely(esp < (sizeof(struct task_struct) + 1024))) {
+		extern void show_stack(unsigned long *);
+
+		printk("do_IRQ: stack overflow: %ld\n",
+			esp - sizeof(struct task_struct));
+		__asm__ __volatile__("movl %%esp,%0" : "=r" (esp));
+		show_stack((void *)esp);
+	}
+#endif
 
 	kstat.irqs[cpu][irq]++;
 	spin_lock(&desc->lock);