Re: [PATCH 0/2] jump label: 2.6.38 updates

[David Miller]

From: Steven Rostedt <rostedt@xxxxxxxxxxx>
Date: Mon, 14 Feb 2011 16:39:36 -0500

> Thus it is not about global, as global is updated by normal means and
> will update the caches. atomic_t is updated via the ll/sc that ignores
> the cache and causes all this to break down. IOW... broken hardware ;)

I don't see how cache coherency can possibly work if the hardware
behaves this way.

In cache aliasing situations, yes I can understand a L1 cache visibility
issue being present, but with kernel only stuff that should never happen
otherwise we have a bug in the arch cache flushing support.
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