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task_numa_placement() oopsed on NULL p->mm when task_numa_fault() got called in the handling of break_ksm() for ksmd. That might be a peculiar case, which perhaps KSM could takes steps to avoid? but it's more robust if task_numa_placement() allows for such a possibility. Signed-off-by: Hugh Dickins <[email protected]> Acked-by: Mel Gorman <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>