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xen: clarify locking used when pinning a pagetable.
Add some comments explaining the locking and pinning algorithm when using split pte locks. Also implement a minor optimisation of not pinning the PTE when not using split pte locks. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Xen-devel <xen-devel@lists.xensource.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Jeremy Fitzhardinge
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Ingo Molnar
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Aug 20, 2008
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