编译内核时出现了以下错误信息：
To see full details build your kernel with:'make CONFIG_DEBUG_SECTION_MISMATCH=y'
GEN .version
CHK include/linux/compile.h
UPD include/linux/compile.h
CC init/version.o
LD init/built-in.o
LD .tmp_vmlinux1
init/built-in.o: In function `run_init_process':
/home/liuhui8989/Information/linux-2.6.31/init/main.c:827: undefined reference to `__gnu_mcount_nc'
init/built-in.o: In function `init_post':
/home/liuhui8989/Information/linux-2.6.31/init/main.c:837: undefined reference to `__gnu_mcount_nc'
init/built-in.o: In function `do_one_initcall':
/home/liuhui8989/Information/linux-2.6.31/init/main.c:741: undefined reference to `__gnu_mcount_nc'
init/built-in.o: In function `name_to_dev_t':
/home/liuhui8989/Information/linux-2.6.31/init/do_mounts.c:78: undefined reference to `__gnu_mcount_nc'
init/built-in.o: In function `rest_init':
/home/liuhui8989/Information/linux-2.6.31/init/main.c:451: undefined reference to `__gnu_mcount_nc'
init/built-in.o:/home/liuhui8989/Information/linux-2.6.31/init/calibrate.c:123: more undefined references to `__gnu_mcount_nc' follow
make: *** [.tmp_vmlinux1] 错误 1
查找了很多资料最后在整出来，记下来以后参考。
首先参考：http://www.linuxidc.com/Linux/2012-02/53883.htm
这个基本就可以解决问题了，只不过一开始自己没有那么高的觉悟，操作失误的。
首先申明，这些文件的操作是针对你编译的内核源码包的，不要操作错误。
现在开始写具体的解决步骤的：
需要补丁__gnu_mcount_nc_patch.patch.gz
免费下载地址在 http://linux.linuxidc.com/
用户名与密码都是www.linuxidc.com
具体下载目录在 /2012年资料/2月/11日/Linux内核编译错误/
下载之后放在Linux内核根目录下，如我的是：/home/liuhui8989/Information/linux-2.6.31从终端下进入根目录/home/liuhui8989/Information/linux-2.6.31下执行以下操作：
gunzip -dc __gnu_mcount_nc_patch.patch.gz |patch -p1
(注意：“__”为两个下划线连在一起，“p1”后面的是阿拉伯数字1，还要注意空格）
打印出以下信息即表示成功：
root@ubuntu:/home/liuhui8989/Information/linux-2.6.31# gunzip -dc __gnu_mcount_nc_patch.patch.gz |patch -p1
patching file arch/arm/include/asm/ftrace.h
patching file arch/arm/kernel/armksyms.c
patching file arch/arm/kernel/entry-common.S
注：解压__gnu_mcount_nc_patch.patch.gz的，命令：gunzip -d __gnu_mcount_nc_patch.patch.gz
原文：http://blog.csdn.net/liuhui_8989/article/details/8105139