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chp 9.3 - 2

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Yi Wang
2017-08-25 11:06:22 +08:00
parent 37f140c1a1
commit 62b2c86602
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Concepts/initcall.md
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@@ -33,7 +33,7 @@ static int __init nmi_warning_debugfs(void)
}
```
from the [arch/x86/kernel/nmi.c](https://github.com/torvalds/linux/blob/master/arch/x86/kernel/nmi.c) source code file. As we may see it just creates the `nmi_longest_ns` [debugfs](https://en.wikipedia.org/wiki/Debugfs) file in the `arch_debugfs_dir` directory. Actually, this `debugfs` file may be created only after the `arch_debugfs_dir` will be created. Creation of this directory occurs during the architecture-specific initialization of the Linux kernel. Actually this directory will be created in the `arch_kdebugfs_init` function from the [arch/x86/kernel/kdebugfs.c](https://github.com/torvalds/linux/blob/master/arch/x86/kernel/kdebugfs.c) source code file. Note that the `arch_kdebugfs_init` function is marked as `initcall` too:
这个函数出自源码文件 [arch/x86/kernel/nmi.c](https://github.com/torvalds/linux/blob/master/arch/x86/kernel/nmi.c)。我们可以看到，这个函数只是在 `arch_debugfs_dir` 目录中创建 `nmi_longest_ns` [debugfs](https://en.wikipedia.org/wiki/Debugfs) 文件。实际上，只有在 `arch_debugfs_dir` 创建后，才会创建这个 `debugfs` 文件。这个目录是在Linux内核特定架构的初始化期间创建的。实际上，该目录将在源码文件 [arch/x86/kernel/kdebugfs.c](https://github.com/torvalds/linux/blob/master/arch/x86/kernel/kdebugfs.c) 的 `arch_kdebugfs_init` 函数中创建。注意 `arch_kdebugfs_init` 函数也被标记为 `initcall`。from the [arch/x86/kernel/nmi.c](https://github.com/torvalds/linux/blob/master/arch/x86/kernel/nmi.c) source code file. As we may see it just creates the `nmi_longest_ns` [debugfs](https://en.wikipedia.org/wiki/Debugfs) file in the `arch_debugfs_dir` directory. Actually, this `debugfs` file may be created only after the `arch_debugfs_dir` will be created. Creation of this directory occurs during the architecture-specific initialization of the Linux kernel. Actually this directory will be created in the `arch_kdebugfs_init` function from the [arch/x86/kernel/kdebugfs.c](https://github.com/torvalds/linux/blob/master/arch/x86/kernel/kdebugfs.c) source code file. Note that the `arch_kdebugfs_init` function is marked as `initcall` too:
```C
arch_initcall(arch_kdebugfs_init);