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x86: PAT: add follow_pfnmp_pte routine to help tracking pfnmap pages - v3

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Impact: New currently unused interface.

Add a generic interface to follow pfn in a pfnmap vma range. This is used by
one of the subsequent x86 PAT related patch to keep track of memory types
for vma regions across vma copy and free.

Signed-off-by: Venkatesh Pallipadi <[email protected]>
Signed-off-by: Suresh Siddha <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>
This commit is contained in:
[email protected] 2008-12-18 11:41:28 -08:00 • committed by H. Peter Anvin
commit e121e41844
2 changed files with 46 additions and 0 deletions
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43
mm/memory.c
View file

@ -1111,6 +1111,49 @@ no_page_table:
return page;
}
int follow_pfnmap_pte(struct vm_area_struct *vma, unsigned long address,
pte_t *ret_ptep)
{
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *ptep, pte;
spinlock_t *ptl;
struct page *page;
struct mm_struct *mm = vma->vm_mm;
if (!is_pfn_mapping(vma))
goto err;
page = NULL;
pgd = pgd_offset(mm, address);
if (pgd_none(*pgd) || unlikely(pgd_bad(*pgd)))
goto err;
pud = pud_offset(pgd, address);
if (pud_none(*pud) || unlikely(pud_bad(*pud)))
goto err;
pmd = pmd_offset(pud, address);
if (pmd_none(*pmd) || unlikely(pmd_bad(*pmd)))
goto err;
ptep = pte_offset_map_lock(mm, pmd, address, &ptl);
pte = *ptep;
if (!pte_present(pte))
goto err_unlock;
*ret_ptep = pte;
pte_unmap_unlock(ptep, ptl);
return 0;
err_unlock:
pte_unmap_unlock(ptep, ptl);
err:
return -EINVAL;
}
/* Can we do the FOLL_ANON optimization? */
static inline int use_zero_page(struct vm_area_struct *vma)
{