#ifndef _LINUX_MMU_CONTEXT_H#define _LINUX_MMU_CONTEXT_H#include<asm/mmu_context.h>structmm_struct;voiduse_mm(structmm_struct*mm);voidunuse_mm(structmm_struct*mm);/* Architectures that care about IRQ state in switch_mm can override this. */#ifndef switch_mm_irqs_off# define switch_mm_irqs_off switch_mm#endif#endif