Subject: [PATCH v4 10/13] mm/debug_vm_pgtable/thp: Use page table depost/withdraw with THP

From: "Aneesh Kumar K.V" <[email-masked]>
Date: Wed, 2 Sep 2020 17:12:19 +0530

Architectures like ppc64 use deposited page table while updating the
huge pte entries.

Signed-off-by: Aneesh Kumar K.V <[email-masked]>
---
 mm/debug_vm_pgtable.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
index 2bc1952e5f83..26023d990bd0 100644
--- a/mm/debug_vm_pgtable.c
+++ b/mm/debug_vm_pgtable.c
@@ -154,7 +154,7 @@ static void __init pmd_basic_tests(unsigned long pfn, pgprot_t prot)
 static void __init pmd_advanced_tests(struct mm_struct *mm,
 				      struct vm_area_struct *vma, pmd_t *pmdp,
 				      unsigned long pfn, unsigned long vaddr,
-				      pgprot_t prot)
+				      pgprot_t prot, pgtable_t pgtable)
 {
 	pmd_t pmd;
 
@@ -165,6 +165,8 @@ static void __init pmd_advanced_tests(struct mm_struct *mm,
 	/* Align the address wrt HPAGE_PMD_SIZE */
 	vaddr = (vaddr & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE;
 
+	pgtable_trans_huge_deposit(mm, pmdp, pgtable);
+
 	pmd = pmd_mkhuge(pfn_pmd(pfn, prot));
 	set_pmd_at(mm, vaddr, pmdp, pmd);
 	pmdp_set_wrprotect(mm, vaddr, pmdp);
@@ -193,6 +195,8 @@ static void __init pmd_advanced_tests(struct mm_struct *mm,
 	pmdp_test_and_clear_young(vma, vaddr, pmdp);
 	pmd = READ_ONCE(*pmdp);
 	WARN_ON(pmd_young(pmd));
+
+	pgtable = pgtable_trans_huge_withdraw(mm, pmdp);
 }
 
 static void __init pmd_leaf_tests(unsigned long pfn, pgprot_t prot)
@@ -371,7 +375,7 @@ static void __init pud_basic_tests(unsigned long pfn, pgprot_t prot) { }
 static void __init pmd_advanced_tests(struct mm_struct *mm,
 				      struct vm_area_struct *vma, pmd_t *pmdp,
 				      unsigned long pfn, unsigned long vaddr,
-				      pgprot_t prot)
+				      pgprot_t prot, pgtable_t pgtable)
 {
 }
 static void __init pud_advanced_tests(struct mm_struct *mm,
@@ -1048,7 +1052,7 @@ static int __init debug_vm_pgtable(void)
 
 	ptl = pmd_lock(mm, pmdp);
 	pmd_clear_tests(mm, pmdp);
-	pmd_advanced_tests(mm, vma, pmdp, pmd_aligned, vaddr, prot);
+	pmd_advanced_tests(mm, vma, pmdp, pmd_aligned, vaddr, prot, saved_ptep);
 	pmd_huge_tests(pmdp, pmd_aligned, prot);
 	pmd_populate_tests(mm, pmdp, saved_ptep);
 	spin_unlock(ptl);
-- 
2.26.2