#ifndef KCL_KCL_MMAP_LOCK_H
#define KCL_KCL_MMAP_LOCK_H

#ifdef HAVE_LINUX_MMAP_LOCK_H
#include <linux/mmap_lock.h>
#else
/* Copied from include/linux/mmap_lock.h */
static inline void mmap_init_lock(struct mm_struct *mm)
{
	init_rwsem(&mm->mmap_sem);
}

static inline void mmap_write_lock(struct mm_struct *mm)
{
	down_write(&mm->mmap_sem);
}

static inline bool mmap_write_trylock(struct mm_struct *mm)
{
	return down_write_trylock(&mm->mmap_sem) != 0;
}

static inline void mmap_write_unlock(struct mm_struct *mm)
{
	up_write(&mm->mmap_sem);
}

static inline void mmap_write_downgrade(struct mm_struct *mm)
{
	downgrade_write(&mm->mmap_sem);
}

static inline void mmap_read_lock(struct mm_struct *mm)
{
	down_read(&mm->mmap_sem);
}

static inline bool mmap_read_trylock(struct mm_struct *mm)
{
	return down_read_trylock(&mm->mmap_sem) != 0;
}

static inline void mmap_read_unlock(struct mm_struct *mm)
{
	up_read(&mm->mmap_sem);
}
#endif
#endif /* KCL_KCL_MMAP_LOCK_H */