Re: Fixed proken MARK target in POM.

[Anders Fugmann <afu@fugmann.dhs.org>]

Anders Fugmann wrote:
> Harald Welte wrote:
> 
>> On Thu, Jan 09, 2003 at 02:07:37PM +0100, Anders Fugmann wrote:
>>
>>
>>> The patch maintains backward compability, and I request that this 
>>> patch is applied to mainstream (and pushed to the Andrea for kernel 
>>> inclusion), 
>>
>>
>>
>> 1) Where is the compatibility?  I cannot see how this code change would
>>    ensure that
>>     a) old, unpatched kernel works with new, patched userspace
>>     b) new, patched kernel works with old, unpatched userspace
>>    Those two conditions need to be fulfilled, otherwise we cannot make a
>>    change during the stable kernel series.
Looking at bit further, this seems non-trivial as I guess that the 
userspace should compile no matter kernel-headers version - no?

Are defines tolerated? Something like:
#define MARK_BITOPS

and then in the userspace do a:
#ifdef MARK_BITOPS
Whenever the new fileds in the structure is used.

But IMHO this clutters the code up and I would rather avoid that.
Do you know of modules that had the same problem, or do you regard it as 
unresolvable to add an extra field to a structure in the stable series?

Regards
Anders Fugmann