前提

ただprintkするだけ
ネットワークデバイス(ens33,12番)への割り込みを拾う

コード

irq.c

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

MODULE_LICENSE("Dual BSD/GPL");
const int IRQ_NUM = 12;
void *irq_dev_id = (void *)&IRQ_NUM;

irqreturn_t kure_isr(int irq, void *dev_instance){
        printk("kure_isr: %s: irq, %d dev_instance, %p \n", __func__, irq, dev_instance);
        return IRQ_NUM;
}

static int kure_init(void){
        printk("kure_init\n");
        int ret;
        ret = request_irq(IRQ_NUM, kure_isr, IRQF_SHARED, "kure", irq_dev_id);
        if(ret){
                printk("error\n");
        }
        return 0;
}

static void kure_exit(void){
        printk("kure_exit\n");
        free_irq(IRQ_NUM, irq_dev_id);
}

module_init(kure_init);
module_exit(kure_exit);

Makefile

KERNEL_DIR = /lib/modules/$(shell uname -r)/build
BUILD_DIR := $(shell pwd)
VERBOSE   := 0
obj-m := irq.o
all:
        make -C $(KERNEL_DIR) SUBDIRS=$(BUILD_DIR) KBUILD_VERBOSE=$(VERBOSE) modules
clean:
        rm -rf  *.o *.ko *.mod.c *.symvers *.order .tmp_versions .helloworld.*

実行

# make
# insmod irq.ko