> I try to implement a minimun set of IOCTL in kernel, for the amiga graphic
> chipset (grf_cc.c).
> Can I do ioctl() and malloc() / free() inside the kernel ?

The kernel has malloc()/free() calls, but they're different. See malloc(9).

I don't understand what you're trying to do with ioctl(). Like any other
system call, thats a userland C library function which passes parameters 
to the kernel through a special trap. The functions called inside the kernel
have to deal with getting data out of user space, so they won't work if 
called from inside the kernel.

Regards,
	-is