Huge difference in build sizes

[Raghavendra]

Hello Greg,

Thank you for the reply.

On Tuesday 02 December 2014 11:46 PM, Greg KH wrote:
> On Tue, Dec 02, 2014 at 02:38:27PM +0530, Raghavendra wrote:
>> Hello all,
>>
>> I am using Ubuntu-12.04 which came with 3.2 kernel. Parallel to this,
>> I've compiled and installed 3.12.1 kernel using the Ubuntu-3.2's
>> configuration, and the compiler which came with the distro. I've noticed
>> that there is a huge difference in the size of the .ko file between the
>> Ubuntu's kernel and the kernel which I've compiled. Sample results are :
>>
>> $ du -sh usb-storage.ko
>> It shows : 56K for the Ubuntu's 3.2 kernel
>>                   1.3M for the custom kernel that I've compiled
>>
>> I've tested the same thing for a simple hello world module :
>> $ du -sh hello.ko
>> It shows : 4.0k for the Ubuntu's 3.2 kernel
>>                   56k for the custom kernel that I've compiled
>>
>> What could be the reason for this huge amount of difference of storage
>> space in spite of using the same config file and compiler?
> You have not "stripped" the debug symbols from the kernel you built,
> which is what Ubuntu does as part of their build process.  I suggest
> turning off that kernel configuration option, as it's probably not
> needed for your development.
If you are referring to the option "CONFIG_DEBUG_INFO", then it is said 
to 'y' in both the kernel's configuration files.
Is there any other config. option or compiler flags that I need to look for?
>
> Hope this helps,
>
> greg k-h
Thanks,
Raghavendra

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