编译安装Linux Kernel API man手册

1. 进入kernel源代码目录
make installmandocs
如果出现*** You need to install xmlto ***
那么是用yum安装相应的包
yum install xmlto.i686

2. 个人遇到的问题：
安装之后，man 9 alloc_chrdev_region之后，报错！
我觉得和MANPATH有关，make默认安装在/usr/local/man中，我的MANPATH已经
包含着个路径了，但是man就找不到。没办法，又将man9直接复制到/usr/share/man中，
这回就好了！不知道具体原因！

3. 使用：
man 9 alloc_chrdev_region
ALLOC_CHRDEV_REGION(9)           Char devices           ALLOC_CHRDEV_REGION(9)

NAME
       alloc_chrdev_region - register a range of char device numbers

SYNOPSIS
       int alloc_chrdev_region(dev_t * dev, unsigned baseminor, unsigned count, const char * name);

ARGUMENTS
       dev
           output parameter for first assigned number

       baseminor
           first of the requested range of minor numbers

       count
           the number of minor numbers required

       name
           the name of the associated device or driver

DESCRIPTION
       Allocates a range of char device numbers. The major number will be chosen dynamically, and returned (along with the first minor
       number) in dev. Returns zero or a negative error code.

COPYRIGHT
Kernel Hackers Manual 2.6.        March 2011            ALLOC_CHRDEV_REGION(9)
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