make modules_install编译内核驱动为模块，.ko文件在根文件中的位置

原创于 2020-11-23 18:01:04 发布

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本文档介绍了如何自定义Linux内核外部模块的安装路径和目录。通过设置INSTALL_MOD_PATH变量，可以在/frodo/路径下安装模块。此外，使用INSTALL_MOD_DIR可以将模块安装到如/lib/modules/$(KERNELRELEASE)/gandalf/这样的特定目录，方便管理和组织不同功能的模块。

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依据kernel文档：Documentation/kbuild/modules.txt:Building External Modules第5节描述可以确定位置
描述如下：

--- 5.1 INSTALL_MOD_PATH

	Above are the default directories but as always some level of
	customization is possible. A prefix can be added to the
	installation path using the variable INSTALL_MOD_PATH:

		$ make INSTALL_MOD_PATH=/frodo modules_install
		=> Install dir: /frodo/lib/modules/$(KERNELRELEASE)/kernel/

	INSTALL_MOD_PATH may be set as an ordinary shell variable or,
	as shown above, can be specified on the command line when
	calling "make." This has effect when installing both in-tree
	and out-of-tree modules.

--- 5.2 INSTALL_MOD_DIR

	External modules are by default installed to a directory under
	/lib/modules/$(KERNELRELEASE)/extra/, but you may wish to
	locate modules for a specific functionality in a separate
	directory. For this purpose, use INSTALL_MOD_DIR to specify an
	alternative name to "extra."

		$ make INSTALL_MOD_DIR=gandalf -C $KDIR \
		       M=$PWD modules_install
		=> Install dir: /lib/modules/$(KERNELRELEASE)/gandalf/