Messages in this thread | | | Date | Thu, 12 Feb 2009 13:15:08 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: [ltt-dev] [RFC git tree] Userspace RCU (urcu) for Linux (repost) |
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On Thu, 12 Feb 2009, Paul E. McKenney wrote: > > In other words, you are arguing for using ACCESS_ONCE() in the loops, > but keeping the old ACCESS_ONCE() definition, and declaring BF hardware > broken?
Well, I _also_ argue that if you have a busy loop, you'd better have a cpu_relax() in there somewhere anyway. If you don't, you have a bug.
So I think the BF approach is "borderline broken", but I think it should work, if BF just has whatever appropriate cache flush in its cpu_relax.
Linus
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