__cpuinit的重要性和与之相关的modpost警告

Question

linux内核代码中__cpuinit的真正意义是什么？ 我遇到了正常的内核代码，加入了__cpuinit函数。这给了我大量的modpost警告。这是正常的还是严重的错误？

Answer 1

__ cpuinit实际上告诉编译器将函数放入指定的elf部分。

#define __cpuinit        __section(.cpuinit.text) __cold

内核代码在include / linux / init.h中说：

 /* 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.  ......