arc: use asm-generic/mmu_context.h for no-op implementations

 * Initialize the context related info for a new mm_struct

 * instance.

 */

#define init_new_context init_new_context

static inline int

init_new_context(struct task_struct *tsk, struct mm_struct *mm)

{

	return 0;

}

#define destroy_context destroy_context

static inline void destroy_context(struct mm_struct *mm)

{

	unsigned long flags;

}

/*

 * Called at the time of execve() to get a new ASID

 * Note the subtlety here: get_new_mmu_context() behaves differently here

 * vs. in switch_mm(). Here it always returns a new ASID, because mm has

 * an unallocated "initial" value, while in latter, it moves to a new ASID,

 * only if it was unallocated

 * activate_mm defaults (in asm-generic) to switch_mm and is called at the

 * time of execve() to get a new ASID Note the subtlety here:

 * get_new_mmu_context() behaves differently here vs. in switch_mm(). Here

 * it always returns a new ASID, because mm has an unallocated "initial"

 * value, while in latter, it moves to a new ASID, only if it was

 * unallocated

 */

#define activate_mm(prev, next)		switch_mm(prev, next, NULL)

/* it seemed that deactivate_mm( ) is a reasonable place to do book-keeping

 * for retiring-mm. However destroy_context( ) still needs to do that because

 * there is a good chance that task gets sched-out/in, making it's ASID valid

 * again (this teased me for a whole day).

 */

#define deactivate_mm(tsk, mm)   do { } while (0)

#define enter_lazy_tlb(mm, tsk)

#include <asm-generic/mmu_context.h>

#endif /* __ASM_ARC_MMU_CONTEXT_H */