通过linux-header编译安装out of tree 模块

因为linux-header包里面含有/lib/modules/build,指向header安装的根目录
所以通过一个简单的makefile

obj-m += xxxx.o
all:
    make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
clean:
    make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

就能直接得到ko模块

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