kernel-ark/include/asm-x86_64/mmu.h

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#ifndef __x86_64_MMU_H
#define __x86_64_MMU_H
#include <linux/spinlock.h>
#include <asm/semaphore.h>
/*
* The x86_64 doesn't have a mmu context, but
* we put the segment information here.
*
* cpu_vm_mask is used to optimize ldt flushing.
*/
typedef struct {
void *ldt;
rwlock_t ldtlock;
int size;
struct semaphore sem;
} mm_context_t;
#endif