6.1的cdevsw结构里没有d_maj了？

btdm

编译6.1的kld示例程序报错：
  
    进入cdev目录下的module, make load,报错说找不到d_maj这个field。察看/usr/include/sys/conf.h，发现struct cdevsw里没有d_maj，而且sdev变量以前是dev_t类型，现在变成了struct cdev * 类型，不知内部机制发生了什么变化，现在想指定主设备号要怎么办呢？

mingyanguo

ls -l /dev
现在应该没有major了吧。
d_maj似乎在4的时候有。

btdm

找到原因了，原来major动态分配了
http://readlist.com/lists/freebs ... urrent/3/15931.html

Major numbers are now dynamically assigned. The shims for allowing
drivers to choose a static major number were removed a few months ago.
There is no work-around for this; just don't include the field anymore
in 6-current sources. If there is something that thinks it needs
explicit knowledge of major numbers, let me know and we can discuss how
to fix it.