ioctl, compat_ioctl and ioctl32

[James Hansen <debian-amd64@f0rmula.com>]

I'm having trouble inserting a module into the kernel.  It was 
originally written for a 32bit architecture, as were the binaries that 
use it, and the kernel seems to be calling ioctl32 rather than ioctl.

ioctl32(app:2342): Unknown cmd fd(7) etc etc.

I imagine this is to allow the 32bit binaries (and libraries) to use the 
64bit kernel, allowing for some conversion to take place.

The problem is when building the module, if I add an entry to my fops 
struct for ioctl32 (or from a little bit of research 'compat_ioctl'), it 
complains that this is an unknown field in the kernel's fops struct.

I'm using the default kernel btw.  Would anyone know why I'm unable to 
add this field to the struct?  Or could anyone refer me to anything that 
might explain things?

Thanks a lot

James