Scull在2.6.35-30内核中的编译解决方案

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简介:LDD3作为从事驱动开发工作人员的必要参考资料,认真研究书中的附带源码具有很高的参考价值,但由于代码基于2.6.10内核,部分内核API较老,导致在2.6.35-30等较新内核上编译不能通过,由于工作需要,特花了一段时间进行整理,本篇文章对示例源码中的第一个驱动程序SCULL进行整理,供各位同仁参考:

LDD3作为从事驱动开发工作人员的必要参考资料,认真研究书中的附带源码具有很高的参考价值,但由于代码基于2.6.10内核,部分内核API较老,导致在2.6.35-30等较新内核上编译不能通过,由于工作需要,特花了一段时间进行整理,本篇文章对示例源码中的第一个驱动程序SCULL进行整理,供各位同仁参考:

1、修改Makefile的第24行:

如果是基于PC,则KERNELDIR ?= /lib/modules/$(shell uname -r)/build(我的PC中linux内核是2.6.35版本)

如果是基于arm,则改变为:

KERNELDIR ?= ……/……/……/……/linux/linux-2.6.35-30(arm开发板上所需内核的源码目录)

2、进入scull目录,执行make,有如下错误:

make -C /lib/modules/2.6.35-30-generic/build M=/media/orientation/driver/ldd3/examples/scull LDDINC=/media/orientation/driver/ldd3/examples/scull/……/include modules make[1]: Entering directory `/usr/src/linux-headers-2.6.32-28-generic' scripts/Makefile.build:49: *** CFLAGS was changed in "/media/orientation/driver/ldd3/examples/scull/Makefile". Fix it to use EXTRA_CFLAGS. Stop. make[1]: *** [_module_/media/orientation/driver/ldd3/examples/scull] Error 2 make[1]: Leaving directory `/usr/src/linux-headers-2.6.32-28-generic' make: *** [modules] Error 2 3、根据错误提示,修改Makefile中12、13行代码如下:

EXTRA_CFLAGS += $(DEBFLAGS)

EXTRA_CFLAGS += -I$(LDDINC)

4、接着make,错误如下:

make -C /lib/modules/2.6.35-30-generic/build M=/media/orientation/driver/ldd3/examples/scull LDDINC=/media/orientation/driver/ldd3/examples/scull/……/include modules make[1]: Entering directory `/usr/src/linux-headers-2.6.32-28-generic' CC [M] /media/orientation/driver/ldd3/examples/scull/main.o /media/orientation/driver/ldd3/examples/scull/main.c:17:26: error: linux/config.h: No such file or directory make[2]: *** [/media/orientation/driver/ldd3/examples/scull/main.o] Error 1 make[1]: *** [_module_/media/orientation/driver/ldd3/examples/scull] Error 2 make[1]: Leaving directory `/usr/src/linux-headers-2.6.32-28-generic' make: *** [modules] Error 2root@ubuntu:/media/orientation/driver/ldd3/examples/scull# vim Makefileroot@ubuntu:/media/orientation/driver/ldd3/examples/scull# make make -C /lib/modules/2.6.32-28-generic/build M=/media/orientation/driver/ldd3/examples/scull LDDINC=/media/orientation/driver/ldd3/examples/scull/……/include modules make[1]: Entering directory `/usr/src/linux-headers-2.6.32-28-generic' CC [M] /media/orientation/driver/ldd3/examples/scull/main.o /media/orientation/driver/ldd3/examples/scull/main.c:17:26: error: linux/config.h: No such file or directory make[2]: *** [/media/orientation/driver/ldd3/examples/scull/main.o] Error 1 make[1]: *** [_module_/media/orientation/driver/ldd3/examples/scull] Error 2 make[1]: Leaving directory `/usr/src/linux-headers-2.6.32-28-generic 5、根据提示,查看2.6.35.30源码发现linux/config.h文件不存在,直接在main.c里将他屏蔽,接着编译,仍有错误:

make -C /lib/modules/2.6.35-30-generic/build M=/media/orientation/driver/ldd3/examples/scull LDDINC=/media/orientation/driver/ldd3/examples/scull/……/include modules make[1]: Entering directory `/usr/src/linux-headers-2.6.32-28-generic' CC [M] /media/orientation/driver/ldd3/examples/scull/main.o CC [M] /media/orientation/driver/ldd3/examples/scull/pipe.o /media/orientation/driver/ldd3/examples/scull/pipe.c: In function ‘scull_p_read’:/media/orientation/driver/ldd3/examples/scull/pipe.c:131: error: ‘TASK_INTERRUPTIBLE’ undeclared (first use in this function)

/media/orientation/driver/ldd3/examples/scull/pipe.c:131: error: (Each undeclared identifier is reported only once /media/orientation/driver/ldd3/examples/scull/pipe.c:131: error: for each function it appears in.)

/media/orientation/driver/ldd3/examples/scull/pipe.c:131: error: implicit declaration of function ‘signal_pending’/media/orientation/driver/ldd3/examples/scull/pipe.c:131: error: implicit declaration of function ‘schedule’/media/orientation/driver/ldd3/examples/scull/pipe.c: In function ‘scull_getwritespace’:/media/orientation/driver/ldd3/examples/scull/pipe.c:168: error: ‘TASK_INTERRUPTIBLE’ undeclared (first use in this function)

/media/orientation/driver/ldd3/examples/scull/pipe.c: In function ‘scull_p_write’:/media/orientation/driver/ldd3/examples/scull/pipe.c:219: error: ‘TASK_INTERRUPTIBLE’ undeclared (first use in this function)

/media/orientation/driver/ldd3/examples/scull/pipe.c:223: error: ‘SIGIO’ undeclared (first use in this function)

/media/orientation/driver/ldd3/examples/scull/pipe.c:223: error: ‘POLL_IN’ undeclared (first use in this function)

make[2]: *** [/media/orientation/driver/ldd3/examples/scull/pipe.o] Error 1 make[1]: *** [_module_/media/orientation/driver/ldd3/examples/scull] Error 2 make[1]: Leaving directory `/usr/src/linux-headers-2.6.32-28-generic' make: *** [modules] Error 2 6、根据提示,TASK_INTERRUPTIBLE没有声明,我们在源码里面搜索,发现该宏定义在<linux/sched.h>中,故在pipe.c中加入该头文件,接着make:

make -C /lib/modules/2.6.35-30-generic/build M=/media/orientation/driver/ldd3/examples/scull LDDINC=/media/orientation/driver/ldd3/examples/scull/……/include modules make[1]: Entering directory `/usr/src/linux-headers-2.6.35-30-generic' CC [M] /media/orientation/driver/ldd3/examples/scull/pipe.o CC [M] /media/orientation/driver/ldd3/examples/scull/access.o /media/orientation/driver/ldd3/examples/scull/access.c: In function ‘scull_u_open’:/media/orientation/driver/ldd3/examples/scull/access.c:106: error: dereferencing pointer to incomplete type /media/orientation/driver/ldd3/examples/scull/access.c:107: error: dereferencing pointer to incomplete type /media/orientation/driver/ldd3/examples/scull/access.c:114: error: dereferencing pointer to incomplete type /media/orientation/driver/ldd3/examples/scull/access.c: In function ‘scull_w_available’:/media/orientation/driver/ldd3/examples/scull/access.c:165: error: dereferencing pointer to incomplete type /media/orientation/driver/ldd3/examples/scull/access.c:166: error: dereferencing pointer to incomplete type /media/orientation/driver/ldd3/examples/scull/access.c: In function ‘scull_w_open’:/media/orientation/driver/ldd3/examples/scull/access.c:179: error: ‘TASK_INTERRUPTIBLE’ undeclared (first use in this function)

/media/orientation/driver/ldd3/examples/scull/access.c:179: error: (Each undeclared identifier is reported only once /media/orientation/driver/ldd3/examples/scull/access.c:179: error: for each function it appears in.)

/media/orientation/driver/ldd3/examples/scull/access.c:179: error: implicit declaration offunction ‘signal_pending’/media/orientation/driver/ldd3/examples/scull/access.c:179: error: implicit declaration offunction ‘schedule’/media/orientation/driver/ldd3/examples/scull/access.c:184: error: dereferencing pointer to incomplete type /media/orientation/driver/ldd3/examples/scull/access.c: In function ‘scull_w_release’:/media/orientation/driver/ldd3/examples/scull/access.c:205: error: ‘TASK_INTERRUPTIBLE’ undeclared (first use in this function)

/media/orientation/driver/ldd3/examples/scull/access.c: In function ‘scull_c_open’:/media/orientation/driver/ldd3/examples/scull/access.c:277: error: dereferencing pointer to incomplete type /media/orientation/driver/ldd3/examples/scull/access.c:281: error: dereferencing pointer to incomplete type make[2]: *** [/media/orientation/driver/ldd3/examples/scull/access.o] Error 1 make[1]: *** [_module_/media/orientation/driver/ldd3/examples/scull] Error 2 make[1]: Leaving directory `/usr/src/linux-headers-2.6.32-28-generic' make: *** [modules] Error 2 7、根据提示,同上所述,我们需要在access.c中加入头文件<sched.h>,接着编译:

make -C /lib/modules/2.6.35-30-generic/build M=/media/orientation/driver/ldd3/examples/scull LDDINC=/media/orientation/driver/ldd3/examples/scull/……/include modules make[1]: Entering directory `/usr/src/linux-headers-2.6.32-28-generic' CC [M] /media/orientation/driver/ldd3/examples/scull/access.o /media/orientation/driver/ldd3/examples/scull/access.c: In function ‘scull_u_open’:/media/orientation/driver/ldd3/examples/scull/access.c:106: error: ‘struct task_struct’ has no member named ‘uid’/media/orientation/driver/ldd3/examples/scull/access.c:107: error: ‘struct task_struct’ has no member named ‘euid’/media/orientation/driver/ldd3/examples/scull/access.c:114: error: ‘struct task_struct’ has no member named ‘uid’/media/orientation/driver/ldd3/examples/scull/access.c: In function ‘scull_w_available’:/media/orientation/driver/ldd3/examples/scull/access.c:165: error: ‘struct task_struct’ has no member named ‘uid’/media/orientation/driver/ldd3/examples/scull/access.c:166: error: ‘struct task_struct’ has no member named ‘euid’/media/orientation/driver/ldd3/examples/scull/access.c: In function ‘scull_w_open’:/media/orientation/driver/ldd3/examples/scull/access.c:184: error: ‘struct task_struct’ has no member named ‘uid’make[2]: *** [/media/orientation/driver/ldd3/examples/scull/access.o] Error 1 make[1]: *** [_module_/media/orientation/driver/ldd3/examples/scull] Error 2 make[1]: Leaving directory `/usr/src/linux-headers-2.6.32-28-generic' make: *** [modules] Error 2 8、根据提示,错误在于task_struct结构体没有uid,euid成员变量,查看源码发现struct task_struct定义在include/linux/sched.h中,确实没有这两个成员,逐个成员分析发现,这两个成员在2.6.35内核中放在const struct cred *cred成员中了,所以,我们尝试将所有出现错误的地方做如下改动:

current->uid 修改为 current->cred->uid current->euid 修改为 current->cred->euid 9、接着make,发现成功编译。

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