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chp 9.3 - 3

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Yi Wang
2017-08-25 17:28:53 +08:00
parent a86704f668
commit 6f75ae9ac0
1 changed files with 5 additions and 5 deletions
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10
Concepts/initcall.md
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@@ -50,7 +50,7 @@ Linux内核在调用 `fs` 相关的 `initcalls` 之前调用所有特定架构
* `device`;
* `late`.
它们的所有的命名是由定义在源码文件 [init/main.c](https://github.com/torvalds/linux/blob/master/init/main.c) 中的数组 `initcall_level_names` 来描述的：All of their names are represented by the `initcall_level_names` array which is defined in the [init/main.c](https://github.com/torvalds/linux/blob/master/init/main.c) source code file:
它们的所有名称是由数组 `initcall_level_names` 来描述的，该数组定义在源码文件 [init/main.c](https://github.com/torvalds/linux/blob/master/init/main.c) 中：All of their names are represented by the `initcall_level_names` array which is defined in the [init/main.c](https://github.com/torvalds/linux/blob/master/init/main.c) source code file:
```C
static char *initcall_level_names[] __initdata = {
@@ -65,12 +65,12 @@ static char *initcall_level_names[] __initdata = {
};
```
All functions which are marked as `initcall` by these identifiers, will be called in the same order or at first `early initcalls` will be called, at second `core initcalls` and etc. From this moment we know a little about `initcall` mechanism, so we can start to dive into the source code of the Linux kernel to see how this mechanism is implemented.
所有用这些（相同的）标识符标记为 `initcall` 的函数将会以相同的顺序被调用， `early initcalls` 会首先被调用，其次是 `core initcalls`，以此类推。现在，我们对 `initcall` 机制了解点了，所以我们可以开始潜入Linux内核源码，来看看这个机制是如何实现的。All functions which are marked as `initcall` by these identifiers, will be called in the same order or at first `early initcalls` will be called, at second `core initcalls` and etc. From this moment we know a little about `initcall` mechanism, so we can start to dive into the source code of the Linux kernel to see how this mechanism is implemented.
Implementation initcall mechanism in the Linux kernel
initcall机制在Linux内核中的实现Implementation initcall mechanism in the Linux kernel
--------------------------------------------------------------------------------
The Linux kernel provides a set of macros from the [include/linux/init.h](https://github.com/torvalds/linux/blob/master/include/linux/init.h) header file to mark a given function as `initcall`. All of these macros are pretty simple:
Linux内核提供了一组来自头文件 [include/linux/init.h](https://github.com/torvalds/linux/blob/master/include/linux/init.h) 的宏，来标记给定的函数为 `initcall`。所有这些宏都相当简单：The Linux kernel provides a set of macros from the [include/linux/init.h](https://github.com/torvalds/linux/blob/master/include/linux/init.h) header file to mark a given function as `initcall`. All of these macros are pretty simple:
```C
#define early_initcall(fn) __define_initcall(fn, early)
@@ -83,7 +83,7 @@ The Linux kernel provides a set of macros from the [include/linux/init.h](https:
#define late_initcall(fn) __define_initcall(fn, 7)
```
and as we may see these macros just expand to the call of the `__define_initcall` macro from the same header file. Moreover, the `__define_initcall` macro takes two arguments:
我们可以看到这些宏只是从相同的头文件扩展为 `__define_initcall` 宏的调用。此外，`__define_initcall` 宏有两个参数：and as we may see these macros just expand to the call of the `__define_initcall` macro from the same header file. Moreover, the `__define_initcall` macro takes two arguments:
* `fn` - callback function which will be called during call of `initcalls` of the certain level;
* `id` - identifier to identify `initcall` to prevent error when two the same `initcalls` point to the same handler.