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I found that virt_addr_valid() was returning true for fixmap addresses. I'm not sure whether pfn_valid() is supposed to include this test, but there's no harm in being explicit. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Jiri Slaby <jirislaby@gmail.com> Cc: Yinghai Lu <yinghai@kernel.org> LKML-Reference: <49B166D6.2080505@goop.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>