x86: make e820_update_range() handle small range update
Impact: enhance e820 code to handle more cases Try to handle new range which could be covered by one entry. Signed-off-by: NYinghai Lu <yinghai@kernel.org> Cc: jbeulich@novell.com LKML-Reference: <49B9F0C1.10402@kernel.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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