Re: [uml-devel] kernel module support broken on x86-64?

[Boaz Harrosh <bharrosh@panasas.com>]

juergen.kadidlo@exasol.com wrote:
> Boaz Harrosh wrote:
>> juergen.kadidlo@exasol.com wrote:
>>   
>>> Hi!
>>>
>>>  I've compiled an UML kernel based on 2.6.25 but loading kernel modules 
>>> seems to be broken. No matter which module I try to load the output 
>>> looks similar to this:
>>>
>>>  overflow in relocation type 11 val 80836d41
>>> 'loop' likely not compiled with -mcmodel=kernel
>>>
>>> After searching for a while I found some threads from 2006 discussing 
>>> this issue, e.g.:
>>> http://www.mail-archive.com/user-mode-linux-devel@lists.sourceforge.net/msg03693.html
>>> and
>>> http://marc.info/?l=user-mode-linux-devel&m=115125101012707&w=2
>>>
>>> As Andi Kleen has mentioned in a mail from the first thread, simply 
>>> appending "-mcmodel=kernel" to the KBUILD_CFLAGS does not work (I tried 
>>> it anyway and can confirm his statement ;)
>>>
>>> Since I could not find any solution I've decided to write this mail and 
>>> ask about the current state of this issue and of course for a solution! 
>>> I simply don't want to believe that there is no loadable module support 
>>> for UML in 2008...
>>>
>>> Regards
>>> JK
>>>
>>>     
>>
>> Every thing is fine down here. What host Kernel-gcc-glibc / uml-gcc-glibc
>> are you using?
>>
>> I'm using out-of-tree modules with uml for every kernel since 2.6.19.
>> I have both Host and UML as x86_64 on FC7 with gcc 4.1.2
>>
>> Boaz
>>
>>   
> I'm glad to here that the bug has been fixed. Anyway, it does not work
> with my configuration:
> 
>  - CentOS 5.1 as host system and UML root fs
>  - Kernel 2.6.25.4 (vanilla, but config taken from the CentOS kernel)
>  - GCC 4.1.2
>  - GLIBC 2.5
> 
> Regards
> JK
> 

I used to run with red-hat 4.5 so this should work.
64 bit, right?

From passed experience I've seen that UML will only
work if I first do "make ARCH=um defconfig"  and then
manually enable any needed options with make xconfig.
other wise it breaks in all kind of ways. Even doing
a make oldconfig on a good uml config file from older
kernel will not work. Try to do defconfig and see if
it loads at all.

How do you compile and run the out-of-tree module
or is it one of the built in modules?

Boaz


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