How to write Makefile for kernel modules

最新推荐文章于 2025-02-12 20:37:26 发布

原创最新推荐文章于 2025-02-12 20:37:26 发布 · 636 阅读

1 ·

CC 4.0 BY-SA版权

文章标签：

#Makefile kernel modu

linux kernel modules 专栏收录该内容

1 篇文章

订阅专栏

本文介绍了一个用于构建Linux内核模块的Makefile示例。通过条件判断KERNELRELEASE是否存在来决定构建流程，若不存在，则通过一系列命令完成内核模块的构建。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >


ifneq ($(KERNELRELEASE),)                    
obj-m := mymodule.o                                 
mymodule-objs := file_one.o file_two.o      
                                                                   
                                                                   
else
KDIR := /lib/modules/$(shell uname -r)/build     
PWD := $(shell pwd)                                           
default:
       $(MAKE) -C $(KDIR) M=$(PWD) modules  
clean:
       rm -rf .*.cmd *.o *.mod.c *.ko .tmp_versions
endif

1. Reading the makefile and then find that the KERNELRELEASE haven't defined because KERNELRELEASE equal null at firstly
2. Execute commands in the else scope, then come to the $(MAKE) -C $(KDIR) M=$(PWD) modules
3. Then change directory into $(KDIR),read the makefile in this path ($KDIR),we called it kbuild
4. Return to the current path $(PWD)
5. Kbuild is started and read makefile again specificted by M=$(PWD). KERNELRELEASE is defined now for kbuild have maked it.
6. Then come to the obj-m and my-module-objs setting, and kbuild finishes the remain works, creating the kernel modules .