Christoph Lameter wrote:
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.
Of course, thanks. I was only thinking of the case where loads
were moved from the unlocked into the locked section.
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