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LoongArch has already implemented cmpxchg_local(), this_cpu_cmpxchg() and similar functions, so select HAVE_CMPXCHG_LOCAL in Kconfig to avoid incurring the overhead of local_irq_save()/local_irq_restore() for page state helpers in mm/vmstat.c. Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> Signed-off-by: maoxiaochuan <maoxiaochuan@loongson.cn>