mm/debug_vm_pgtable: populate a pte entry before fetching it

pte_clear_tests operate on an existing pte entry. Make sure that is not a none
pte entry.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>

mm/debug_vm_pgtable.c

@@ -546,7 +546,7 @@ static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp,
 static void __init pte_clear_tests(struct mm_struct *mm, pte_t *ptep,
 				   unsigned long vaddr)
 {
-	pte_t pte = ptep_get(ptep);
+	pte_t pte =  ptep_get_and_clear(mm, vaddr, ptep);
 
 	pr_debug("Validating PTE clear\n");
 	pte = __pte(pte_val(pte) | RANDOM_ORVALUE);
@@ -944,7 +944,7 @@ static int __init debug_vm_pgtable(void)
 	p4d_t *p4dp, *saved_p4dp;
 	pud_t *pudp, *saved_pudp;
 	pmd_t *pmdp, *saved_pmdp, pmd;
-	pte_t *ptep;
+	pte_t *ptep, pte;
 	pgtable_t saved_ptep;
 	pgprot_t prot, protnone;
 	phys_addr_t paddr;
@@ -1049,6 +1049,8 @@ static int __init debug_vm_pgtable(void)
 	 */
 
 	ptep = pte_alloc_map_lock(mm, pmdp, vaddr, &ptl);
+	pte = pfn_pte(pte_aligned, prot);
+	set_pte_at(mm, vaddr, ptep, pte);
 	pte_clear_tests(mm, ptep, vaddr);
 	pte_advanced_tests(mm, vma, ptep, pte_aligned, vaddr, prot);
 	pte_unmap_unlock(ptep, ptl);