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x86: PAT: remove follow_pfnmap_pte in favor of follow_phys

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Impact: Cleanup - removes a new function in favor of a recently modified older one.

Replace follow_pfnmap_pte in pat code with follow_phys. follow_phys lso
returns protection eliminating the need of pte_pgprot call. Using follow_phys
also eliminates the need for pte_pa.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
venkatesh.pallipadi@intel.com
2008-12-19 13:47:28 -08:00
committed by H. Peter Anvin
parent d87fe6607c
commit 982d789ab7
4 changed files with 11 additions and 70 deletions
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43
mm/memory.c
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@ -1168,49 +1168,6 @@ 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)
{