Linux kernel 如何定义内核模块之间的依赖关系？

如何定义内核中模块的依赖关系

例如：

got module1 and module2.

我怎么说内核

module2

应该在

module1

之后加载，或者

module2

依赖于

module1

---

注意：module2没有使用module1中的任何符号，但在我的用例中顺序仍然很重要。所以不要在内核中与moddep联系起来。

引用depmod手册页：

   Linux kernel modules can provide services (called "symbols") for other
   modules to use (using one of the EXPORT_SYMBOL variants in the code).
   If a second module uses this symbol, that second module clearly depends
   on the first module. These dependencies can get quite complex.

   depmod creates a list of module dependencies by reading each module
   under /lib/modules/version and determining what symbols it exports and
   what symbols it needs. By default, this list is written to modules.dep,
   and a binary hashed version named modules.dep.bin, in the same
   directory. If filenames are given on the command line, only those
   modules are examined (which is rarely useful unless all modules are
   listed).  depmod also creates a list of symbols provided by modules in
   the file named modules.symbols and its binary hashed version,
   modules.symbols.bin. Finally, depmod will output a file named
   modules.devname if modules supply special device names (devname) that
   should be populated in /dev on boot (by a utility such as udev).

---

为了便于解决，您可以在第一个模块中添加符号，并在第二个模块init中检查该符号。如果未使用导出符号

EXPORT_SYMBOL 

您可以从第二个模块初始化本身返回

有关详细信息，请参阅页眉

      Linux kernel modules can provide services (called "symbols") for other
   modules to use (using one of the EXPORT_SYMBOL variants in the code).
   If a second module uses this symbol, that second module clearly depends
   on the first module. These dependencies can get quite complex.

   depmod creates a list of module dependencies by reading each module
   under /lib/modules/version and determining what symbols it exports and
   what symbols it needs. By default, this list is written to modules.dep,
   and a binary hashed version named modules.dep.bin, in the same
   directory. If filenames are given on the command line, only those
   modules are examined (which is rarely useful unless all modules are
   listed).  depmod also creates a list of symbols provided by modules in
   the file named modules.symbols and its binary hashed version,
   modules.symbols.bin. Finally, depmod will output a file named
   modules.devname if modules supply special device names (devname) that
   should be populated in /dev on boot (by a utility such as udev).

---

从Linux4.4内核（可能更早）开始，可以使用软依赖项来指定在请求加载模块之前或之后加载内核模块。这些软依赖项可以按照modprobe.d（5）手册页中的描述在配置文件中设置，也可以直接使用

module\u SOFTDEP

宏在内核模块的代码中指定

要通过修改

module2

的代码在

module1

之后完成加载

module2

，请在

module2

代码的函数外添加此行：

MODULE\u SOFTDEP（“pre:module1”）

要通过修改

模块1

代码来实现这一点，可以使用以下行：

MODULE\u SOFTDEP（“post:module2”）

我们不能手动执行吗？@srinivasth您能提供有关您试图解决的问题的更多信息吗？可能重复您所说的是外部模块（aka文件）还是内置模块？