Commit 48667e7a authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds
Browse files

Move vmalloc_to_page() to mm/vmalloc. 



We already have page table manipulation for vmalloc in vmalloc.c. Move the
vmalloc_to_page() function there as well.

Move the definitions for vmalloc related functions in mm.h to a newly created
section.  A better place would be vmalloc.h but mm.h is basic and may depend
on these functions.  An alternative would be to include vmalloc.h in mm.h
(like done for vmstat.h).

Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent eebd2aa3

include/linux/mm.h

+4 −2
Original line number Diff line number Diff line
@@ -231,6 +231,10 @@ static inline int get_page_unless_zero(struct page *page) 
	return atomic_inc_not_zero(&page->_count);

}



/* Support for virtually mapped pages */

struct page *vmalloc_to_page(void *addr);

unsigned long vmalloc_to_pfn(void *addr);



static inline struct page *compound_head(struct page *page)

{

	if (unlikely(PageTail(page)))
@@ -1089,8 +1093,6 @@ static inline unsigned long vma_pages(struct vm_area_struct *vma) 


pgprot_t vm_get_page_prot(unsigned long vm_flags);

struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);

struct page *vmalloc_to_page(void *addr);

unsigned long vmalloc_to_pfn(void *addr);

int remap_pfn_range(struct vm_area_struct *, unsigned long addr,

			unsigned long pfn, unsigned long size, pgprot_t);

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

mm/memory.c

+0 −40
Original line number Diff line number Diff line
@@ -2618,46 +2618,6 @@ int make_pages_present(unsigned long addr, unsigned long end) 
	return ret == len ? 0 : -1;

}



/* 

 * Map a vmalloc()-space virtual address to the physical page.

 */

struct page * vmalloc_to_page(void * vmalloc_addr)

{

	unsigned long addr = (unsigned long) vmalloc_addr;

	struct page *page = NULL;

	pgd_t *pgd = pgd_offset_k(addr);

	pud_t *pud;

	pmd_t *pmd;

	pte_t *ptep, pte;

  

	if (!pgd_none(*pgd)) {

		pud = pud_offset(pgd, addr);

		if (!pud_none(*pud)) {

			pmd = pmd_offset(pud, addr);

			if (!pmd_none(*pmd)) {

				ptep = pte_offset_map(pmd, addr);

				pte = *ptep;

				if (pte_present(pte))

					page = pte_page(pte);

				pte_unmap(ptep);

			}

		}

	}

	return page;

}



EXPORT_SYMBOL(vmalloc_to_page);



/*

 * Map a vmalloc()-space virtual address to the physical page frame number.

 */

unsigned long vmalloc_to_pfn(void * vmalloc_addr)

{

	return page_to_pfn(vmalloc_to_page(vmalloc_addr));

}



EXPORT_SYMBOL(vmalloc_to_pfn);



#if !defined(__HAVE_ARCH_GATE_AREA)



#if defined(AT_SYSINFO_EHDR)

mm/vmalloc.c

+38 −0
Original line number Diff line number Diff line
@@ -166,6 +166,44 @@ int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page ***pages) 
}

EXPORT_SYMBOL_GPL(map_vm_area);



/*

 * Map a vmalloc()-space virtual address to the physical page.

 */

struct page *vmalloc_to_page(void *vmalloc_addr)

{

	unsigned long addr = (unsigned long) vmalloc_addr;

	struct page *page = NULL;

	pgd_t *pgd = pgd_offset_k(addr);

	pud_t *pud;

	pmd_t *pmd;

	pte_t *ptep, pte;



	if (!pgd_none(*pgd)) {

		pud = pud_offset(pgd, addr);

		if (!pud_none(*pud)) {

			pmd = pmd_offset(pud, addr);

			if (!pmd_none(*pmd)) {

				ptep = pte_offset_map(pmd, addr);

				pte = *ptep;

				if (pte_present(pte))

					page = pte_page(pte);

				pte_unmap(ptep);

			}

		}

	}

	return page;

}

EXPORT_SYMBOL(vmalloc_to_page);



/*

 * Map a vmalloc()-space virtual address to the physical page frame number.

 */

unsigned long vmalloc_to_pfn(void *vmalloc_addr)

{

	return page_to_pfn(vmalloc_to_page(vmalloc_addr));

}

EXPORT_SYMBOL(vmalloc_to_pfn);



static struct vm_struct *__get_vm_area_node(unsigned long size, unsigned long flags,

					    unsigned long start, unsigned long end,

					    int node, gfp_t gfp_mask)

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