x86: PAT: remove follow_pfnmap_pte in favor of follow_phys

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>

1 files changed, 0 insertions, 43 deletions

diff --git a/mm/memory.c b/mm/memory.c
index 79f28e35d4fc..6b29f39a5a3e 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -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)
 {