__cpuinit和modpost相關的警告的意義

Question

Linux內核代碼中__cpuinit的真正意義是什麼？ 我遇到了正常的內核代碼，它接受__cpuinit函數。這給我大量的modpost警告。這是正常的還是一個嚴重的錯誤？

Answer 1

__cpuinit實際上告訴編譯器將函數放入指定的elf部分。

#define __cpuinit  __section(.cpuinit.text) __cold 

內核代碼中說在include/linux/init.h中：

/* modpost check for section mismatches during the kernel build. 
* A section mismatch happens when there are references from a 
* code or data section to an init section (both code or data). 
* The init sections are (for most archs) discarded by the kernel 
* when early init has completed so all such references are potential bugs. 
* For exit sections the same issue exists. ......