Making it maximally broken is the phrase you are looking for I believe
> I was going to provide a patch to do something like this, but unless I
> misunderstood Alan I think he said there are ioctl's which can be used
> to convert the 64 bit structs while passing to 32 bit user space. I'm
> getting lost finding them though...
>
> Anyway, I guess this is only a problem while were're still limited to
> 32 bit user space with 64 bit kernels.
Look at the sparc32 entry points for sparc64, especially
arch/sparc64/kernel/sys_sparc32.c
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