16. 编译内核模块

想要编译网卡驱动，该怎么做，这里以Taishan 200(Kunpeng 920)的板载网卡驱动hns3, sas为例

16.1. 获取内核源码

git clone --depth=1 https://github.com/torvalds/linux.git

--depth=1 是为了更快复制，指包含所有文件的最近一个commit， 不包含全部的commits.

16.2. 在源码目录树下编译

在linux内核源码目录目录树下， 例如我的目录树在/home/user1/linux, cd进去执行

make olddefconfig && make prepare                       #生成config
make -C . M=drivers/net/ethernet/hisilicon/hns3 modules #生成ko
make -C . M=drivers/net/ethernet/hisilicon/hns3 clean   #删除ko

-C . 指明内核源码目录 M 指明模块路径

编译结果

Building modules, stage 2.
MODPOST 4 modules
CC [M]  drivers/net/ethernet/hisilicon/hns3/hnae3.mod.o
LD [M]  drivers/net/ethernet/hisilicon/hns3/hnae3.ko
CC [M]  drivers/net/ethernet/hisilicon/hns3/hns3.mod.o
LD [M]  drivers/net/ethernet/hisilicon/hns3/hns3.ko
CC [M]  drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge.mod.o
LD [M]  drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge.ko
CC [M]  drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf.mod.o
LD [M]  drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf.ko

16.3. 在源码目录树外编译

make -C ../../linux/ M=$(pwd) modules
make -C ../../linux/ M=$(pwd) clean

16.4. 问题记录

16.4.1. 问题：asm/errno.h: No such file or directory

[user1@centos linux]$ make -C . M=drivers/net/ethernet/hisilicon/hns3 modules
make: Entering directory `/home/user1/linux'
  CC [M]  drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.o
In file included from ./include/linux/errno.h:5:0,
                 from ./include/linux/acpi.h:11,
                 from drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c:4:
./include/uapi/linux/errno.h:1:23: fatal error: asm/errno.h: No such file or directory
 #include <asm/errno.h>
                       ^
compilation terminated.
make[3]: *** [drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.o] Error 1
make[2]: *** [drivers/net/ethernet/hisilicon/hns3/hns3pf] Error 2
make[1]: *** [drivers/net/ethernet/hisilicon/hns3] Error 2
make: *** [sub-make] Error 2
make: Leaving directory `/home/user1/linux'

解决办法

make olddefconfig && make prepare

问题: ERROR: Kernel configuration is invalid ————————————————————-=

[user1@centos linux]$ make -C . M=drivers/scsi/hisi_sas modules
make: Entering directory '/home/user1/linux'

  ERROR: Kernel configuration is invalid.
         include/generated/autoconf.h or include/config/auto.conf are missing.
         Run 'make oldconfig && make prepare' on kernel src to fix it.

Makefile:613: include/config/auto.conf: No such file or directory
make: *** [Makefile:685: include/config/auto.conf] Error 1
make: Leaving directory '/home/user1/linux'

解决办法

make olddefconfig && make prepare

16.4.2. 问题：scripts/genksyms/genksyms: No such file or directory

[user1@centos linux-4.18.0-80.7.2.el8_0]$ make -C . M=drivers/scsi/hisi_sas modules
make: Entering directory '/home/user1/open_software/kernel-src-4.18/linux-4.18.0-80.7.2.el8_0'
  CC [M]  drivers/scsi/hisi_sas/hisi_sas_main.o
/bin/sh: scripts/genksyms/genksyms: No such file or directory
make[1]: *** [scripts/Makefile.build:322: drivers/scsi/hisi_sas/hisi_sas_main.o] Error 1
make: *** [Makefile:1528: _module_drivers/scsi/hisi_sas] Error 2
make: Leaving directory '/home/user1/open_software/kernel-src-4.18/linux-4.18.0-80.7.2.el8_0'

解决办法

make olddefconfig && make prepare scripts