mm: make vm_insert_pfn_prot() static

int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);

int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,

			unsigned long pfn);

int vm_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr,

			unsigned long pfn, pgprot_t pgprot);

vm_fault_t vmf_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr,

			unsigned long pfn, pgprot_t pgprot);

vm_fault_t vmf_insert_mixed(struct vm_area_struct *vma, unsigned long addr,

	return retval;

}

/**

 * vm_insert_pfn - insert single pfn into user vma

 * @vma: user vma to map to

 * @addr: target user address of this page

 * @pfn: source kernel pfn

 *

 * Similar to vm_insert_page, this allows drivers to insert individual pages

 * they've allocated into a user vma. Same comments apply.

 *

 * This function should only be called from a vm_ops->fault handler, and

 * in that case the handler should return NULL.

 *

 * vma cannot be a COW mapping.

 *

 * As this is called only for pages that do not currently exist, we

 * do not need to flush old virtual caches or the TLB.

 */

int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,

			unsigned long pfn)

{

	return vm_insert_pfn_prot(vma, addr, pfn, vma->vm_page_prot);

}

EXPORT_SYMBOL(vm_insert_pfn);

int vm_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr,

static int vm_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr,

			unsigned long pfn, pgprot_t pgprot)

{

	int ret;

	return ret;

}

/**

 * vm_insert_pfn - insert single pfn into user vma

 * @vma: user vma to map to

 * @addr: target user address of this page

 * @pfn: source kernel pfn

 *

 * Similar to vm_insert_page, this allows drivers to insert individual pages

 * they've allocated into a user vma. Same comments apply.

 *

 * This function should only be called from a vm_ops->fault handler, and

 * in that case the handler should return NULL.

 *

 * vma cannot be a COW mapping.

 *

 * As this is called only for pages that do not currently exist, we

 * do not need to flush old virtual caches or the TLB.

 */

int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,

			unsigned long pfn)

{

	return vm_insert_pfn_prot(vma, addr, pfn, vma->vm_page_prot);

}

EXPORT_SYMBOL(vm_insert_pfn);

/**

 * vmf_insert_pfn_prot - insert single pfn into user vma with specified pgprot

 * @vma: user vma to map to