Building modules for rhel5 kernel

Build modules for kernel instead of building the whole kernel

Download the kernel rpm
$ rpm -ivh kernel-2.6.18-x.x.x.el5.src.rpm
$ cd /usr/src/redhat/SPECS/
$ rpmbuild -bp kernel-2.6.spec

will take some time but less than rebuilding the entire kernel hopefully
$ cd /usr/src/redhat/BUILD/kernel-2.6.18/linux-2.6.18.x86_64
$ cp /boot/config-2.6.18-x.x.x.el5 .config
$ make menuconfig

Here for examplepurpose i’m taking xfs and reiserfs module hopefully it works with whatever you chose
* For xfs/reiserfs make sure to chose xfs and reiserfs as the module
$ make fs/xfs/xfs.ko
In case of error run
$ make SUBDIRS=fs/xfs/ modules
and rerun
$ make fs/xfs/xfs.ko
$ mkdir -p /lib/modules/`uname -r`/kernel/fs/xfs
Copy the module into the /lib/modules/`uname -r`/kernel/fs/xfs
$ cp fs/xfs/xfs.ko /lib/modules/`uname -r`/kernel/fs/xfs
$ make fs/reiserfs/reiserfs.ko
In case of error run
$ make SUBDIRS=fs/reiserfs/ modules
and rerun
$ make fs/reiserfs/reiserfs.ko
$ mkdir -p /lib/modules/`uname -r`/kernel/fs/reiserfs
Copy the module into the /lib/modules/`uname -r`/kernel/fs/reiserfs
$ cp fs/reiserfs/reiserfs.ko /lib/modules/`uname -r`/kernel/fs/reiserfs

Change permissions
$ chmod 744 /lib/modules/`uname -r`/kernel/fs/reiserfs/reiserfs.ko
$ chmod 744 /lib/modules/`uname -r`/kernel/fs/xfs/xfs.ko

insmod the required module
$ insmod /lib/modules/`uname -r`/kernel/fs/reiserfs/reiserfs.ko
$ insmod /lib/modules/`uname -r`/kernel/fs/xfs/xfs.ko
Make entry into /etc/modules.conf
$ echo “install reiserfs /sbin/insmod /lib/modules/2.6.18-x.x.x.el5/kernel/fs/reiserfs/reiserfs.ko ” >> /etc/modules.conf
$ echo “install xfs /sbin/insmod /lib/modules/2.6.18-x.x.x.el5/kernel/fs/xfs/xfs.ko ” >> /etc/modules.conf

$ modprobe reiserfs
$ modprobe xfs
$ depmod -a
Should be done hopefully

January 14, 2010 - Posted by derwynd | Uncategorized

5 Comments »

$ cp fs/xfs/xfs.ko /lib/modules/`uname -r`/kernel/fs/reiserfs

should be

reiserfs.ko instead of xfs.ko

Comment by Ren | November 2, 2011 | Reply
It does not boot….

Scanning and configuring dmraid supported devices
Scanning logical volumes
Reading all physical volumes…
No Volume groups found.
Activating logical volumes
Volume group “VolGroup00” not found
Creating root device.
Mounting root filesystem.
mount: could not find filesystem ‘/dev/root’ <– Error
Setting up other filesystems.
Setting up new root fs
setuproot: moving /dev failed: No such file or directory <– Error
no fstab.sys, mounting internal defaults
setuproot: error mounting /proc: No such file or directory <– Error
setuproot: error mounting /sys: No such file or directory <– Error
Switching to new root and running init.
unmounting old /dev
unmounting old /proc
unmounting old /sys
switchroot: mount failed: No such file or directory

Kernel panic – not syncing: Attempted to kill init

Comment by Van | May 12, 2012 | Reply
- Can you be more specific on the module being built ….
  
  Comment by derwynd | May 14, 2012 | Reply
make SUBDIRS=xx/xxx/ modules Always results in ” make *** No rule to make target ‘modules’. stop

Around every corner there is guaranteed to be another error message to halt the proceedings 😦

My understanding is that we were making the rule here?? So how to resolve this please

Comment by Indy | November 22, 2012 | Reply
- In case of error run
  $ make SUBDIRS=fs/xfs/ modules
  and rerun
  
  It’s been some time that I’ve tried this …
  But as far as my memory goes if you run the command once more the error should go away …..
  In the end just see if the xxx.ko module is present in the dir that you are trying to build and try doing a insmod on the xxx.ko
  If it wrks copy the xxx.ko to the /lib/modules/`uname -r`/dir
  rmmod and insmod and add line in moules.conf file.
  
  Comment by derwynd | November 24, 2012 | Reply

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