ext4 support with custom kernel

**absolutezero1287** · March 18th, 2009

Hi, I was thinking about compiling the Linux kernel with my own specifications. I've done this before in archlinux and my first step was always zcat /proc/config.gz but it seems that I can't access the defualt configs in this manner.

Code:

sudo zcat /proc/config.gz
gzip: /proc/config.gz: No such file or directory

**sanderj** · March 18th, 2009

ext4 is built in in Jaunty Alpha 6 (http://www.ubuntu.com/testing/jaunty...stem%20support).

So the most easy way is to use Jaunty and select ext4 during install.

Download from http://cdimage.ubuntu.com/releases/jaunty/alpha-6/

**skymera** · March 18th, 2009

I think the config is located in the /boot/ directory.

I did find a great guide a while back on compiling kernels. It's a shame none of mine worked.

**regala** · March 18th, 2009

Originally Posted by absolutezero1287

Hi, I was thinking about compiling the Linux kernel with my own specifications. I've done this before in archlinux and my first step was always zcat /proc/config.gz but it seems that I can't access the defualt configs in this manner.

Code:

sudo zcat /proc/config.gz
gzip: /proc/config.gz: No such file or directory

you need to insmod the right kernel module

Code:

# modprobe configs

at this point, the "file" /proc/config.gz exists.

**absolutezero1287** · March 18th, 2009

Originally Posted by regala

you need to insmod the right kernel module

Code:

# modprobe configs

at this point, the "file" /proc/config.gz exists.

Code:

sudo modprobe configs
FATAL: Module configs not found.

Also, I can't update due to later versions of Ubuntu having problems with Compiz. Apparently, someone decided it would be great to blacklist my graphics card.

**sdennie** · March 18th, 2009

Being able to access the current kernel config via proc is itself a kernel option. On Ubuntu, this isn't really an issue because the currently running Ubuntu config is always, /boot/config-`uname -r`. However, the kernel is smart these days and, with no configuration specified/added, "make menuconfig" uses the currently running kernels config as the basis. You can also use "make oldconfig" to get a configuration process that only presents you with config options that don't exist in your old kernel config but do exist in this one.