Messages in this thread |  | | | Date | Tue, 28 Jun 2005 10:01:21 -0700 (PDT) | | From | Christoph Lameter <> | | Subject | Re: [patch 2] mm: speculative get_page |
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On Wed, 29 Jun 2005, Nick Piggin wrote:
> But nit picking aside, is it true that we need a load barrier before > unlock? (store barrier I agree with) The ppc64 changeset in question > indicates yes, but I can't quite work out why. There are noises in the > archives about this, but I didn't pinpoint a conclusion...
A spinlock may be used to read a consistent set of variables. If load operations would be moved below the spin_unlock then one may get values that have been updated after another process acquired the spinlock.
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