linux源码编译

╰+攻爆jí腚メ 2023-06-27 08:49 7阅读 0赞

# 1, 内核升级,编译安装 #

<table> 
 <thead> 
  <tr> 
   <th>只编译某子目录</th> 
   <th>cd 源码根目录: make path/to/dir</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>只编译某模块</td> 
   <td>cd 源码根目录: make path/to/xx.ko.xz</td> 
  </tr> 
 </tbody> 
</table>

wget https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/linux-5.4.7.tar.xz
    tar -xf linux-5.4.7.tar.xz -C /usr/src/
    cd /usr/src
    ln -sf linux-5.4.7 linux
    
    #复制原系统配置文件到此根目录下
    [root@c7 ~]# cd linux
    [root@c7 linux]# ls 
    arch   COPYING  Documentation  include  Kbuild   lib          Makefile         net      scripts   tools
    block  CREDITS  drivers        init     Kconfig  LICENSES     mm               README   security  usr
    certs  crypto   fs             ipc      kernel   MAINTAINERS  modules.builtin  samples  sound     virt
    [root@c7 linux]# cp /boot/config-3.10.0-957.el7.x86_64 .config
    
    #安装编译环境
    [root@c7 linux]# yum groupinstall "Development and Creative Workstation"
    [root@c7 linux]# yum groupinstall "Development Tool"
    
    #开始编译
    [root@c7 linux]# yum -y install screen #开启屏幕会话，杜绝断网中断
    [root@c7 linux]# make menuconfig #做必要修改,保存退出
    [root@c7 linux]# screen -S make_kernel #####开启一个screen会话：
    #------------------screen 会话 窗口 start------------
    [root@c7 linux]# lscpu |grep "CPU(s)"
    CPU(s):                4
    On-line CPU(s) list:   0-3
    NUMA node0 CPU(s):     0-3
    [root@c7 linux]# make -j 4 && make modules_install && make install 
    ##按Ctrl a, d 退出会话，使其后台运行
    #------------------screen 会话 窗口 end------------
    
    [root@c7 linux]# screen -ls
    There are screens on:
    	20301.make_kernel	(Detached)
    	
    ##连接一个screen会话：查看任务状态
    [root@c7 linux]# screen -r 20301.make_kernel 
    
    ##安装成功后，centos7会在/etc/grub2/grub.cfg下生成一个menuentry的条目
    [root@c7 ~]# cat /boot/grub2/grub.cfg |grep ^menuentry
    menuentry 'CentOS Linux (5.4.7) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-957.el7.x86_64-advanced-bbfa535e-0ced-4bad-83d1-be2900ecd4c5' { 
    menuentry 'CentOS Linux (3.10.0-957.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-957.el7.x86_64-advanced-bbfa535e-0ced-4bad-83d1-be2900ecd4c5' { 
    menuentry 'CentOS Linux (0-rescue-a7986f397aa74c2384dac379c3367818) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-a7986f397aa74c2384dac379c3367818-advanced-bbfa535e-0ced-4bad-83d1-be2900ecd4c5' { 
    [root@c7 ~]# 
    [root@c7 ~]# sed -i 's/(\S*)/(5.4.7)/' /boot/grub2/grubenv 
    [root@c7 ~]# cat /boot/grub2/grubenv |grep -v "#"
    saved_entry=CentOS Linux (5.4.7) 7 (Core)

![在这里插入图片描述][2020010523070418.png]

# 2, 内核模块管理，内核参数 #

#1, 查看系统已装载的模块
    [root@c7 ~]# lsmod |head -5
    Module                  Size  Used by
    ip6t_rpfilter          12595  1 
    ipt_REJECT             12541  2 
    nf_reject_ipv4         13373  1 ipt_REJECT
    ip6t_REJECT            12625  2 
    
    #2, 内核模块路径存储
    [root@c7 ~]# uname -r
    3.10.0-957.el7.x86_64
    [root@c7 ~]# ls /lib/modules/`uname -r`/kernel
    arch  crypto  drivers  fs  kernel  lib  mm  net  sound  virt
    
    [root@c7 ~]# modinfo ip6t_rpfilter
    filename:       /lib/modules/3.10.0-957.el7.x86_64/kernel/net/ipv6/netfilter/ip6t_rpfilter.ko.xz
    description:    Xtables: IPv6 reverse path filter match
    author:         Florian Westphal <fw@strlen.de>
    license:        GPL
    retpoline:      Y
    rhelversion:    7.6
    srcversion:     7F2EAB75EFD6D085D98EB70
    depends:        
    intree:         Y
    vermagic:       3.10.0-957.el7.x86_64 SMP mod_unload modversions 
    signer:         CentOS Linux kernel signing key
    sig_key:        B7:0D:CF:0D:F2:D9:B7:F2:91:59:24:82:49:FD:6F:E8:7B:78:14:27
    sig_hashalgo:   sha256
    
    #3.1, 加载/卸载模块 ( modprobe: 能自动解决依赖)
    [root@c7 ~]# ls /lib/modules/3.10.0-957.el7.x86_64/kernel/fs/cifs/
    cifs.ko.xz
    [root@c7 ~]# lsmod |grep cifs
    [root@c7 ~]# modprobe cifs #加载模块
    [root@c7 ~]# lsmod |grep cifs
    cifs                  703764  0 
    dns_resolver           13140  1 cifs
    [root@c7 ~]# modprobe -r cifs #卸载模块
    [root@c7 ~]# lsmod |grep cifs
    
    
    #3.2, 加载/卸载模块 ( insmode, rmmode) : 比如要装载cifs，需要解决依赖关系
    [root@c7 ~]# modinfo cifs
    filename:       /lib/modules/3.10.0-957.el7.x86_64/kernel/fs/cifs/cifs.ko.xz
    description:    VFS to access servers complying with the SNIA CIFS Specification e.g. Samba 
    ...
    depends:        dns_resolver
    
    [root@c7 ~]# modinfo dns_resolver
    filename:       /lib/modules/3.10.0-957.el7.x86_64/kernel/net/dns_resolver/dns_resolver.ko.xz
    depends:        
    parm:           debug:DNS Resolver debugging mask (uint)
    
    #先装载依赖的模块, 再装载自身(不能自动解决依赖)
    [root@c7 ~]# insmod /lib/modules/3.10.0-957.el7.x86_64/kernel/net/dns_resolver/dns_resolver.ko.xz
    [root@c7 ~]# insmod /lib/modules/3.10.0-957.el7.x86_64/kernel/fs/cifs/cifs.ko.xz
    [root@c7 ~]# lsmod |grep cifs
    cifs                  703764  0 
    dns_resolver           13140  1 cifs
    
    #卸载模块 
    [root@c7 ~]# rmmod cifs
    [root@c7 ~]# lsmod |grep cifs
    [root@c7 ~]# lsmod |grep dns_resolver
    dns_resolver           13140  0

[2020010523070418.png]: https://img-blog.csdnimg.cn/2020010523070418.png