由於Linux內核版本更新的原因，LDD3（v2.6.10）提供的源碼無法直接使用，下面是本人
編譯scull源碼時出現的一些問題及解決方法。
編譯環境：CentOS 6.3（kernel version 2.6.32）
編譯錯誤：
make -C /lib/modules/2.6.32-279.14.1.el6.i686/build M=/mnt/HappyStudy/MyDesigner/Linux/LDD3/examples/scull LDDINC=/mnt/HappyStudy/MyDesigner/Linux/LDD3/examples/scull/../include modules
make[1]: Entering directory `/usr/src/kernels/2.6.32-279.14.1.el6.i686'
scripts/Makefile.build:49: *** CFLAGS was changed in "/mnt/HappyStudy/MyDesigner/Linux/LDD3/examples/scull/Makefile". Fix it to use EXTRA_CFLAGS. Stop.
make[1]: *** [_module_/mnt/HappyStudy/MyDesigner/Linux/LDD3/examples/scull] Error 2
make[1]: Leaving directory `/usr/src/kernels/2.6.32-279.14.1.el6.i686'
make: *** [modules] Error 2
解決方案：
CFLAGS與Makefile.build中的CFLAGS沖突，錯誤提示要求將CFLAG換成EXTRA_CFLAGS重新編譯即可；
編譯錯誤：
error: linux/config.h: No such file or directory
解決方案：
從linux-2.6.20起，config.h就已經被移除了.
將#include <linux/config.h>修改成如下——>
#include <linux/version.h>
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
#include <linux/config.h>
#endif
編譯錯誤：
/mnt/HappyStudy/MyDesigner/Linux/LDD3/examples/scull/pipe.c: In function ‘scull_p_read’:
/mnt/HappyStudy/MyDesigner/Linux/LDD3/examples/scull/pipe.c:131: error: ‘TASK_INTERRUPTIBLE’ undeclared (first use in this function)
/mnt/HappyStudy/MyDesigner/Linux/LDD3/examples/scull/pipe.c:131: error: (Each undeclared identifier is reported only once
/mnt/HappyStudy/MyDesigner/Linux/LDD3/examples/scull/pipe.c:131: error: for each function it appears in.)
/mnt/HappyStudy/MyDesigner/Linux/LDD3/examples/scull/pipe.c:131: error: implicit declaration of function ‘signal_pending’
/mnt/HappyStudy/MyDesigner/Linux/LDD3/examples/scull/pipe.c:131: error: implicit declaration of function ‘schedule’
/mnt/HappyStudy/MyDesigner/Linux/LDD3/examples/scull/pipe.c: In function ‘scull_getwritespace’:
/mnt/HappyStudy/MyDesigner/Linux/LDD3/examples/scull/pipe.c:168: error: ‘TASK_INTERRUPTIBLE’ undeclared (first use in this function)
/mnt/HappyStudy/MyDesigner/Linux/LDD3/examples/scull/pipe.c: In function ‘scull_p_write’:
/mnt/HappyStudy/MyDesigner/Linux/LDD3/examples/scull/pipe.c:219: error: ‘TASK_INTERRUPTIBLE’ undeclared (first use in this function)
/mnt/HappyStudy/MyDesigner/Linux/LDD3/examples/scull/pipe.c:223: error: ‘SIGIO’ undeclared (first use in this function)
/mnt/HappyStudy/MyDesigner/Linux/LDD3/examples/scull/pipe.c:223: error: ‘POLL_IN’ undeclared (first use in this function)
make[2]: *** [/mnt/HappyStudy/MyDesigner/Linux/LDD3/examples/scull/pipe.o] Error 1
make[1]: *** [_module_/mnt/HappyStudy/MyDesigner/Linux/LDD3/examples/scull] Error 2
解決方案：
頭文件變動原因，在pipe.c中添加
#include <include/sched.h>
