Re: Help required for Compiling a staging driver

[Greg KH <gregkh@linuxfoundation.org>]

On Tue, Apr 15, 2014 at 12:17:24AM +0530, Kumar Gaurav wrote:
> On Tuesday 15 April 2014 12:16 AM, Greg KH wrote:
> > On Tue, Apr 15, 2014 at 12:08:18AM +0530, Kumar Gaurav wrote:
> >> Hi All,
> >>
> >> I'm trying to upgrade a driver using semaphore to use mutex. I have
> >> applied the required changes. Now i want to compile it to ensure that i
> >> didn't broke the kernel.
> >>
> >> Driver Path:drivers/staging/dgap/
> >> I Marked this driver to load as loadable module
> >>
> >>       kumar@anandlinux:/usr/linux-git$ grep CONFIG_DGAP .config
> >>       CONFIG_DGAP=m
> >>
> >> Now I'm trying to compile it using below command and getting result as given
> >>       kumar@anandlinux:/usr/linux-git$ sudo make M=drivers/staging/dgap/
> >>         Building modules, stage 2.
> >>         MODPOST 0 modules
> > Never build kernel code as root.  We used to have a bug in the build
> > system that if you did this, it would delete your whole filesystem.
> > Some of us argued that we should leave it there just to keep people from
> > ever doing this again :)
> >
> >> So, No module is getting build and again i'm not getting any Error as
> >> well. Please tell me where i'm doing wrong.
> > Have you built this kernel source tree before?  Do a full build first,
> > before trying to just build one directory.  That should resolve the
> > issue.
> What does it mean by full build? You mean compiling All modules? If yes 
> then is there anyway to mark all module at once or i need to mark 
> everything one by one (i use menuconfig)?

There's whole books out there that describe how to configure and build a
kernel, I suggest you look into them first (Linux Kernel in a Nutshell
is free online...)

greg k-h