linux 系统中断是什么意思

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>

static irqreturn_t my_interrupt_handler(int irq, void *dev_id) {
    printk(KERN_INFO "My interrupt occurred!\n");
    return IRQ_HANDLED;
}

static int __init my_module_init(void) {
    int ret;
    ret = request_irq(irq_number, my_interrupt_handler, IRQF_TRIGGER_RISING, "my_irq", NULL);
    if (ret) {
        printk(KERN_ERR "Failed to register IRQ %d\n", irq_number);
        return ret;
    }
    printk(KERN_INFO "Module loaded and IRQ registered.\n");
    return 0;
}

static void __exit my_module_exit(void) {
    free_irq(irq_number, NULL);
    printk(KERN_INFO "Module unloaded and IRQ freed.\n");
}

module_init(my_module_init);
module_exit(my_module_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("A simple module to demonstrate interrupt handling in Linux.");