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第一句是使用默认配置。defconfig的作用如下：
Before compiling the Linux kernel it needs to be configured to select what components will become part of the kernel image, which components will be build as dynamic modules, and which components will be left out all together. This is done using the Linux kernel configuration system.
帮忙解释下下面这两条指令的意义和区别，是不是也可以通过修改Makefile文件，用make all代替？？
