Setting up the mount in the following manner seems to solve the problem. I was able to trigger the build. Unfortunately, because of limited system resources, the build was getting OOMed. UML seems to have terrible block I/O performance. If anyone can test this, please do.
root@uml:~# mount -t hostfs -o /usr/lib/uml/modules hostfs /lib/modules
root@uml:~# mount -t hostfs -o /usr/lib/uml/headers hostfs
/lib/modules/3.2.20/build
root@uml:~# mount -t hostfs -o /usr/lib/uml/headers hostfs
/lib/modules/3.2.20/source
root@uml:~# mount -t hostfs -o /usr/lib/uml/headers hostfs /usr/src/linux/
root@uml:~# free -m
total used free shared buffers cached
Mem: 490 25 465 0 1 10
-/+ buffers/cache: 13 477
Swap: 0 0 0
root@uml:~# df -h
Filesystem Size Used Avail Use% Mounted on
rootfs 1008M 426M 532M 45% /
/dev/root 1008M 426M 532M 45% /
tmpfs 50M 28K 50M 1% /var/run
tmpfs 5.0M 0 5.0M 0% /var/run/lock
tmpfs 768M 0 768M 0% /tmp
tmpfs 10M 0 10M 0% /dev
tmpfs 99M 0 99M 0% /var/run/shm
hostfs 113G 100G 7.3G 94% /lib/modules
hostfs 113G 100G 7.3G 94% /lib/modules/3.2.20/build
hostfs 113G 100G 7.3G 94% /lib/modules/3.2.20/source
hostfs 113G 100G 7.3G 94% /usr/src/linux
On Tuesday 19 June 2012 12:18 AM, Ritesh Raj Sarraf wrote:
> Okay!! Shipping 2 empty directories, build/ and source/, to which we
> could hostfs mount the headers path does help in proceed with the build.
> It further fails because of the missing Makefiles that are shipped by
> the kernel headers package.
>
> root@uml:~# dpkg-reconfigure iscsitarget-dkms
>
> ------------------------------
> Deleting module version: 1.4.20.2
> completely from the DKMS tree.
> ------------------------------
> Done.
>
> Creating symlink /var/lib/dkms/iscsitarget/1.4.20.2/source ->
> /usr/src/iscsitarget-1.4.20.2
>
> DKMS: add completed.
>
> Kernel preparation unnecessary for this kernel. Skipping...
>
> Building module:
> cleaning build area....(bad exit status: 2)
> make KERNELRELEASE=3.2.20 -C /lib/modules/3.2.20/build
> M=/var/lib/dkms/iscsitarget/1.4.20.2/build....(bad exit status: 2)
> Error! Bad return status for module build on kernel: 3.2.20 (x86_64)
> Consult /var/lib/dkms/iscsitarget/1.4.20.2/build/make.log for more
> information.
> root@uml:~# tail ^C
> root@uml:~# less /var/lib/dkms/iscsitarget/1.4.20.2/build/make.log
> DKMS make.log for iscsitarget-1.4.20.2 for kernel 3.2.20 (x86_64)
> Mon Jun 18 18:43:59 UTC 2012
> make: Entering directory `/lib/modules/3.2.20/build'
> make: *** No targets specified and no makefile found. Stop.
> make: Leaving directory `/lib/modules/3.2.20/build'
--
Ritesh Raj Sarraf | http://people.debian.org/~rrs
Debian - The Universal Operating System
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