Re: [PATCH] sched: Remove ACCESS_ONCE() for jiffies

[David Rientjes]

On Tue, 12 Aug 2014, Pranith Kumar wrote:

> It looks more like an inconsistency. These are the only three places
> which use ACCESS_ONCE() for jiffies. Also, in doc/memory-barriers.txt,
> it explicitly states that ACCESS_ONCE(jiffies) is not necessary. I
> grepped for this usage after reading that document just to make sure
> and found these three uses.
> 
> But yes, there is no harm being done by using ACCESS_ONCE().
> 

One could argue that doing ACCESS_ONCE(jiffies) is always better because 
of the context it which it is used rather than qualifying jiffies itself 
as volatile.
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