错误一：
LD .tmp_vmlinux1 init/built-in.o: In function `run_init_process': /home/ox/tq2440/opt/EmbedSky/linux-2.6.30.4/init/main.c:794: undefined reference to `__gnu_mcount_nc' init/built-in.o: In function `init_post': /home/ox/tq2440/opt/EmbedSky/linux-2.6.30.4/init/main.c:804: undefined reference to `__gnu_mcount_nc' init/built-in.o: In function `do_one_initcall': /home/ox/tq2440/opt/EmbedSky/linux-2.6.30.4/init/main.c:706: undefined reference to `__gnu_mcount_nc' init/built-in.o: In function `name_to_dev_t': /home/ox/tq2440/opt/EmbedSky/linux-2.6.30.4/init/do_mounts.c:78: undefined reference to `__gnu_mcount_nc' init/built-in.o: In function `rest_init': /home/ox/tq2440/opt/EmbedSky/linux-2.6.30.4/init/main.c:453: undefined reference to `__gnu_mcount_nc' init/built-in.o:/home/ox/tq2440/opt/EmbedSky/linux-2.6.30.4/init/calibrate.c:123: more undefined references to `__gnu_mcount_nc' follow Makefile:809: recipe for target '.tmp_vmlinux1' failed make: *** [.tmp_vmlinux1] Error 1
1.解决参考：http://blog.csdn.net/u010445505/article/details/39299855
2.下载得到文件__gnu_mcount_nc_patch.patch.gz后，使用命令：gzip -dc __gnu_mcount_nc_patch.patch.gz | patch -p1，再次编译，搞定
错误二：
Can't use 'defined(@array)' (Maybe you should just omit the defined()?) at kernel/timeconst.pl line 373.
1.问题分析：defined不能用
2.问题解决：将kernel/timeconst.pl第373行的defined去掉，即改为：
