config KALLSYMS
是否为了调试或者ksymoops（当oops发生时，可以帮助解析出符号），而加载所有的符号信息（函数名称）。是专家级别的设置，默认是y；
Say Y here to let the kernel print out symbolic crash information and symbolic stack backtraces. This increases the size of the kernel somewhat, as all symbols have to be loaded into the kernel image.
config KALLSYMS_ALL
是否包含所有的符号。默认是打开，最好是包含所有的符号，方便问题分析。
Normally kallsyms only contains the symbols of functions for nicer OOPS messages and backtraces (i.e., symbols from the text and inittext sections). This is sufficient for