32 bit user space compatibility

[Skidanov, Alexey]

Hi,

Running 32 bit user space needs some work to be done with ioctls. I understand that there are two options to implement:
1.       Use only fixed size types. Pad IOCTLS params to multiple of 64 bits - simple; don't know if it covers all compatibility issues; 
2.       32 bit compatibility layer (through compat_ioctl, just like many drivers in kernel implement)  - just a little bit simple code with some translations; really covers all issues;
 
Which one is preferred by kernel community?

Thanks
Alexey
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