On Tue, Feb 26, 2019 at 1:54 AM <valdis.kletnieks@vt.edu> wrote:

> On Mon, 25 Feb 2019 06:43:39 -0500, YU Bo said:
>
> > But, my "question" is:  when i test some program which needs kernel
> headers,
> > where to install those headers file?
> > In Documention/kbuild/headers_install.rst, i learn it :
> >       make headers_install INSTALL_HDR_PATH=/usr
> > In my case, Is it ok to do that?I do not think it will work.
>
> You need to put the headers into a directory that will be accessible to
> your
> "program that needs kernel headers" at build time. Hint: gcc has a "-I"
> option
> for a reason, and CFLAGS is an actual thing for a reason....
>
> Note that in general, most programs *won't* need the new kernel headers,
> because glibc (or musl, or whatever your libc is) will be insulating you
> from
> the actual syscall interface anyhow.
>
> Also, dropping the headers into /usr/include is dangerous, as the next time
> you apply software updates, they could overlay your version of the headers
> with the distro's version, which will cause lots of debugging fun the next
> time
> you rebuild your program and it builds against old headers.  If you're
> lucky,
> the build will fail.  If you're unlucky, the program will build but fail
> in subtle
> ways at runtime....
>
Thank you for reply.I do not kow to explain the way,but i tried it.
In my case,
```bash
# cd  ~/src/kernel-dev/lib/modules/5.0.0-rc8/build
make headers_install
```
I think the way, which can effect  VM(i logged in).
Thank you :)