Kernel module compiler warnings

Kernel module compiler warnings

[Jack]

Could someone kindly explain why I see these warnings:
 
warning: passing argument X of 'SOME_TYPE_HERE' discards qualifiers from
pointer target type.

I know *what* is causing the error - it's a cast removing a const

e.g.  


void foo(const my_type *a)
{
	bar( (my_type*)a );
}


What I don't understand is that it only seems to be emitted when I
compile on my 32 bit machine.  Compiling on my 64bit machine does not
generate this warning

Thank you,
Jack