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去掉编译内核的优化选项

优化级别从 -O2 改为 -O1

修改内核源代码根目录下的Makefile:

```bash
sed -i 's/KBUILD_CFLAGS   += -O2/KBUILD_CFLAGS   += -O1/g' Makefile
```

内核调试选项

```text
Kernel hacking  --->
    Compile-time checks and compiler options  --->
        [*] Compile the kernel with debug info
        [*]   Provide GDB scripts for kernel debugging
        [*] Enable full Section mismatch analysis

    [*] Kernel debugging
```

对应编译选项如下：

```text
 CONFIG_DEBUG_INFO = y
 CONFIG_GDB_SCRIPTS = y
 CONFIG_DEBUG_SECTION_MISMATCH = y
 CONFIG_DEBUG_KERNEL = y
```

为了支持`CONFIG_DEBUG_SECTION_MISMATCH`特性，还需开启`CONFIG_X86_5LEVEL`特性：

```text
[*] Enable 5-level page tables support
```

对应编译选项如下：

```text
CONFIG_X86_5LEVEL = y
```

关闭内核随机地址选项

```text
Processor type and features ---->
    [] Randomize the address of the kernel image (KASLR)
```

对应编译选项如下：

```text
CONFIG_RANDOMIZE_BASE = n
```

`make menuconfig`确认上述编译选项后输出如下：

![config](https://cdn.jsdelivr.net/gh/realwujing/picture-bed/config.png)

编译内核

```bash
make -j`expr $(nproc) \* 2`
```

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