1. 根目录:
2. include
3. linux
4. hugetlb_inline.h

#ifndef _LINUX_HUGETLB_INLINE_H
#define _LINUX_HUGETLB_INLINE_H

#ifdef CONFIG_HUGETLB_PAGE

#include <linux/mm.h>

static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
{
	return vma->vm_flags & VM_HUGETLB;
}

#else

static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
{
	return 0;
}

#endif

#endif