config file part of kernel!

config file part of kernel!

[Sanjeev Aditya Naga]

Hi,

Will it be good, if we make the `config` file (used to
build a kernel) part of the built kernel. So that one in
need, can extract it from the kernel using some
userspace tool!?

During the configuration of kernel, we usually set
the required functionality. However, if we delete the
sources/config file or loose the config file, but later
we wanted to add up some module(s) to the same
kernel, it'd be great if we will be able to extract some
info from the kernel along with the config params!??

Regards,
Sanjeev

Re: config file part of kernel!

[Randy.Dunlap]

On Tue, 22 Apr 2008, Sanjeev Aditya Naga wrote:

> Hi,
> 
> Will it be good, if we make the `config` file (used to
> build a kernel) part of the built kernel. So that one in
> need, can extract it from the kernel using some
> userspace tool!?
> 
> During the configuration of kernel, we usually set
> the required functionality. However, if we delete the
> sources/config file or loose the config file, but later
> we wanted to add up some module(s) to the same
> kernel, it'd be great if we will be able to extract some
> info from the kernel along with the config params!??

This is already possible.

CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y

The former includes the config file in the kernel image.
The latter one puts it into /proc/config.gz as well.

-- 
~Randy

Re: config file part of kernel!

[Dan Noe]

On 4/22/2008 12:53, Sanjeev Aditya Naga wrote:
> Will it be good, if we make the `config` file (used to
> build a kernel) part of the built kernel. So that one in
> need, can extract it from the kernel using some
> userspace tool!?

Enable the CONFIG_IKCONFIG and CONFIG_IKCONFIG_PROC option.  It allows 
you to access the active kernel's .config from /proc.

Cheers,
Dan

-- 
Dan Noe (dpn@lampreynetworks.com)
Software Engineer
Lamprey Networks, Inc.

Re: config file part of kernel!

[Jan Engelhardt]

On Tuesday 2008-04-22 18:53, Sanjeev Aditya Naga wrote:
>
>Will it be good, if we make the `config` file (used to
>build a kernel) part of the built kernel. So that one in
>need, can extract it from the kernel using some
>userspace tool!?

Surprise, what do you think /proc/config.gz is for? :-)

Re: config file part of kernel!

[Rene Herman]

On 22-04-08 21:03, Jan Engelhardt wrote:

> On Tuesday 2008-04-22 18:53, Sanjeev Aditya Naga wrote:
>> Will it be good, if we make the `config` file (used to
>> build a kernel) part of the built kernel. So that one in
>> need, can extract it from the kernel using some
>> userspace tool!?
> 
> Surprise, what do you think /proc/config.gz is for? :-)

Now that you mention it -- why does the kernel export that thing gzipped in 
fact? It has a zlib copy...

Rene.