最近在看《LINUX设备驱动程序》，给出的字符设备驱动程序scull，在linux 2.6.32-22内核上make编译时出现了下面的问题：
make -C /lib/modules/2.6.32-22-generic/build M=/home/elite/Desktop/linux设备驱动开发/examples/scull LDDINC=/home/elite/Desktop/linux设备驱动开发/examples/scull/../include modules
make[1]: Entering directory `/usr/src/linux-headers-2.6.32-22-generic'
scripts/Makefile.build:49: *** CFLAGS was changed in "/home/elite/Desktop/linux设备驱动开发/examples/scull/Makefile". Fix itto use EXTRA_CFLAGS. Stop.
make[1]: *** [_module_/home/elite/Desktop/linux设备驱动开发/examples/scull] Error 2
make[1]: Leaving directory `/usr/src/linux-headers-2.6.32-22-generic'
make: *** [modules] Error 2
打开Makefile，将CFLAGS屏蔽掉：
# CFLAGS += $(DEBFLAGS)
# CFLAGS += -I$(LDDINC)
继续make，又出现了下面的问题：
make -C /lib/modules/2.6.32-22-generic/build M=/home/elite/Desktop/linux设备驱动开发/examples/scull LDDINC=/home/elite/Desktop/linux设备驱动开发/examples/scull/../include modules
make[1]: Entering directory `/usr/src/linux-headers-2.6.32-22-generic'
CC [M] /home/elite/Desktop/linux设备驱动开发/examples/scull/main.o
/home/elite/Desktop/linux设备驱动开发/examples/scull/main.c:17:26: error:linux/config.h: No such file or directory
make[2]: *** [/home/elite/Desktop/linux设备驱动开发/examples/scull/main.o] Error 1
make[1]: *** [_module_/home/elite/Desktop/linux设备驱动开发/examples/scull] Error 2
make[1]: Leaving directory `/usr/src/linux-headers-2.6.32-22-generic'
make: *** [modules] Error 2
linux/config.h文件找不到，可能时新版内核结构改变了，这个文件被删除了吧。
打开main.c，把#include <linux/config.h>删除掉。
继续make，还有问题：
make -C /lib/modules/2.6.32-22-generic/build M=/home/elite/Desktop/linux设备驱动开发/examples/scull LDDINC=/home/elite/Desktop/linux设备驱动开发/examples/scull/../include modules
make[1]: Entering directory `/usr/src/linux-headers-2.6.32-22-generic'
CC [M] /home/elite/Desktop/linux设备驱动开发/examples/scull/main.o
CC [M] /home/elite/Desktop/linux设备驱动开发/examples/scull/pipe.o
/home/elite/Desktop/linux设备驱动开发/examples/scull/pipe.c: In function‘scull_p_read’:
/home/elite/Desktop/linux设备驱动开发/examples/scull/pipe.c:131: error:‘TASK_INTERRUPTIBLE’ undeclared (first use in this function)
/home/elite/Desktop/linux设备驱动开发/examples/scull/pipe.c:131: error: (Eachundeclared identifier is reported only once
/home/elite/Desktop/linux设备驱动开发/examples/scull/pipe.c:131: error: foreach function it appears in.)
/home/elite/Desktop/linux设备驱动开发/examples/scull/pipe.c:131: error:implicit declaration of function ‘signal_pending’
/home/elite/Desktop/linux设备驱动开发/examples/scull/pipe.c:131: error:implicit declaration of function ‘schedule’
/home/elite/Desktop/linux设备驱动开发/examples/scull/pipe.c: In function‘scull_getwritespace’:
/home/elite/Desktop/linux设备驱动开发/examples/scull/pipe.c:168: error:‘TASK_INTERRUPTIBLE’ undeclared (first use in this function)
/home/elite/Desktop/linux设备驱动开发/examples/scull/pipe.c: In function‘scull_p_write’:
/home/elite/Desktop/linux设备驱动开发/examples/scull/pipe.c:219: error:‘TASK_INTERRUPTIBLE’ undeclared (first use in this function)
/home/elite/Desktop/linux设备驱动开发/examples/scull/pipe.c:223: error:‘SIGIO’ undeclared (first use in this function)
/home/elite/Desktop/linux设备驱动开发/examples/scull/pipe.c:223: error:‘POLL_IN’ undeclared (first use in this function)
make[2]: *** [/home/elite/Desktop/linux设备驱动开发/examples/scull/pipe.o] Error 1
make[1]: *** [_module_/home/elite/Desktop/linux设备驱动开发/examples/scull] Error 2
make[1]: Leaving directory `/usr/src/linux-headers-2.6.32-22-generic'
make: *** [modules] Error 2
TASK_INTERRUPTIBLE找不到，既然前面删除掉了了一个头文件，必然有很多变量找不到，
那就到/usr/src/linux-headers-2.6.32-22-generic下grep一下呗：
最终找到头文件,添加上：
#include <linux/sched.h>
access.c也需要添加上面的头文件。
然后，还得make，痛苦阿。。。。
make -C /lib/modules/2.6.32-22-generic/build M=/home/elite/Desktop/linux设备驱动开发/examples/scull LDDINC=/home/elite/Desktop/linux设备驱动开发/examples/scull/../include modules
make[1]: Entering directory `/usr/src/linux-headers-2.6.32-22-generic'
CC [M] /home/elite/Desktop/linux设备驱动开发/examples/scull/access.o
/home/elite/Desktop/linux设备驱动开发/examples/scull/access.c: In function‘scull_u_open’:
/home/elite/Desktop/linux设备驱动开发/examples/scull/access.c:107: error:‘struct task_struct’ has no member named ‘uid’
/home/elite/Desktop/linux设备驱动开发/examples/scull/access.c:108: error:‘struct task_struct’ has no member named ‘euid’
/home/elite/Desktop/linux设备驱动开发/examples/scull/access.c:115: error:‘struct task_struct’ has no member named ‘uid’
/home/elite/Desktop/linux设备驱动开发/examples/scull/access.c: In function‘scull_w_available’:
/home/elite/Desktop/linux设备驱动开发/examples/scull/access.c:166: error:‘struct task_struct’ has no member named ‘uid’
/home/elite/Desktop/linux设备驱动开发/examples/scull/access.c:167: error:‘struct task_struct’ has no member named ‘euid’
/home/elite/Desktop/linux设备驱动开发/examples/scull/access.c: In function‘scull_w_open’:
/home/elite/Desktop/linux设备驱动开发/examples/scull/access.c:185: error:‘struct task_struct’ has no member named ‘uid’
make[2]: *** [/home/elite/Desktop/linux设备驱动开发/examples/scull/access.o] Error 1
make[1]: *** [_module_/home/elite/Desktop/linux设备驱动开发/examples/scull] Error 2
make[1]: Leaving directory `/usr/src/linux-headers-2.6.32-22-generic'
make: *** [modules] Error 2