Re: (*(unsigned long *)&jiffies)++;

[Philip Blundell]

>	Exactly. What's the point of declaring it as volatile if you're later 
>going
>to cast the volatile away? The compiler has the right to ignore the fact
>that it's volatile at that point.

The `volatile' is there so that loops like

	oldtime = jiffies;
	while ((jiffies - oldtime) < HZ)
		;

work.  It serves no useful purpose when assigning to the variable, and casting 
it away prevents other optimisations from being inhibited.

p.