Re: Aic7xxx and Aic79xx Driver Updates

[Linus Torvalds]

On 2 May 2003, James Bottomley wrote:
> 
> I'm not asking for any changes to the way you do 2.4, just for 2.5 where
> we have no vendor versions to support and there should only be a single
> tree.

The way the backwards-compatibility is _meant_ to work is that a driver 
can just do this:

	#ifndef IRQ_RETVAL
	  typedef void irqreturn_t;
	  #define IRQ_NONE
	  #define IRQ_HANDLED
	  #define IRQ_RETVAL(x)
	#endif

and after that you can just use the 2.5.x semantics even with a 2.4.x 
kernel.

Which is nice and clean, and allows you to support old kernels _without_ 
having any translation layer.

		Linus