How to test a syscall prior to compiling the kernel

[greg@kroah.com (Greg KH)]

On Wed, Jun 04, 2014 at 02:33:41PM -0400, Andev wrote:
> On Wed, Jun 4, 2014 at 1:56 PM,  <Valdis.Kletnieks@vt.edu> wrote:
> >
> > The trick to remember is that you probably don't want to use the ramdisk
> > as the permanent host, so...
> >
> > 1) Setup your git tree on permanent storage
> > 2) Set up your ramdisk
> > 3) cd /my/source/tree
> > 4) tar -c --exclude=.git -f - . | (cd /mnt/ramdisk && tar -xvf -)
> >
> > then cd /mnt/ramdisk and start building.  Remember if you make changes to
> > copy them back to /my/source/tree :)
> >
> > (The --exclude=.git will avoid copying about 900M onto the ramdisk.  Skip that
> > if you need the git history on the ramdisk for doing a bisect or similar)
> 
> Thanks Valdis for the instructions.
> 
> So I tried the following to mount a tmpfs
> 
> $ sudo mount -t tmpfs -o size=2000m tmpfs ./ramlinux/
> $ tar -c --exclude=.git -f - . | (cd ~/ramlinux && tar -xvf -)
> 
> And it works fine. I am not sure if tmpfs has any advantages over ramdisk.

It's the same thing :)