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Register pfn_is_ram helper speed up reading /proc/vmcore in the kdump kernel. It is compiled only if the kernel source is recent enough to have the pfn_is_ram helper (v3.0-rc1, commit 997c136f518c5debd63847e78e2a8694f56dcf90). Signed-off-by: Olaf Hering <olaf@aepfle.de> Committed-by: Jan Beulich <jbeulich@suse.com>