问题描述
我在Linux内核中修改了一些文件
I modified some files in the Linux kernel
include/linux/tcp.h
include/net/tcp.h
net/ipv4/sysctl_net_ipv4.c
net/ipv4/tcp_output.c
在此之后，我编译了修改后的Linux内核
Following this i compiled the modified Linux kernel
$ make modules_install
$ make headers_install INSTALL_HDR_PATH=/usr/include
$ make install
新内核可以启动，一切似乎都很正常.但是，当我尝试在应用程序中包含修改后的内核头文件时，编译器抱怨该头文件未定义我刚刚添加的类型.检查/usr/include/netinet/tcp.h后，我发现它不是我修改的文件.
The new kernel can start, everything seems normal. But when i tried to include the modified kernel header in my app, the compiler complains that the header does NOT define the types which i have just added. Upon checking /usr/include/netinet/tcp.h, i find that it is NOT the file i modified.
推荐答案
在更改某些Linux标头时，请先执行make命令以查看是否有任何副作用.内核可能无法编译.这是绝对必要的.
As you are changing some linux header, do a make first to see whether there are any side effects. The kernel might not compile. This is absolutely necessary.
我认为make对于使内核标头生效的更改也是必要的，以便可以将其导出到用户空间.
I think make is also necessary for the changes to take effect for the kernel headers so that they can be exported to user space.
只需执行make modules_install即可安装已构建的模块，不会针对更改后的头重新编译这些模块.对于其他安装命令也是如此.
Just doing make modules_install will install already built modules, the modules won't be recompiled against the changed headers. Similarly for other install commands.
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