Messages in this thread | | | Subject | Re: (*(unsigned long *)&jiffies)++; | Date | Thu, 06 Jan 2000 22:01:01 +0000 | From | Philip Blundell <> |
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> 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.
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