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further simplify cpa locking: since the largepage-split is a slowpath, use the pgd_lock for the whole operation, intead of the mmap_sem. This also makes it suitable for DEBUG_PAGEALLOC purposes again. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>