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Hibernation fails when the kernel cannot allocate enough memory to copy all pages of RAM in use. Ensure that the failure reason is clearly logged, and clearly attributable to the hibernation module. Signed-off-by: Luigi Semenzato <semenzato@google.com> [ rjw: Subject & changelog ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>