[PATCH V3] mm/debug_vm_pgtable: Add [pte|pmd]_mkwrite_novma() tests

[Anshuman Khandual]

Add some [pte|pmd]_mkwrite_novma() relevant tests.

Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Huang Ying <ying.huang@xxxxxxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Suggested-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
---
These tests clear on arm64 platform after the following recent patch.

https://lore.kernel.org/all/20251015023712.46598-1-ying.huang@xxxxxxxxxxxxxxxxx/

Changes in V3:

- Added a new test combination per Huang

Changes in V2:

https://lore.kernel.org/all/20251022032951.3498553-1-anshuman.khandual@xxxxxxx/

- Added a new test combination per Huang

Changes in V1:

https://lore.kernel.org/all/20251021024424.2390325-1-anshuman.khandual@xxxxxxx/

 mm/debug_vm_pgtable.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
index 830107b6dd08..133543ca2821 100644
--- a/mm/debug_vm_pgtable.c
+++ b/mm/debug_vm_pgtable.c
@@ -102,6 +102,12 @@ static void __init pte_basic_tests(struct pgtable_debug_args *args, int idx)
 	WARN_ON(pte_write(pte_wrprotect(pte_mkwrite(pte, args->vma))));
 	WARN_ON(pte_dirty(pte_wrprotect(pte_mkclean(pte))));
 	WARN_ON(!pte_dirty(pte_wrprotect(pte_mkdirty(pte))));
+
+	WARN_ON(!pte_dirty(pte_mkwrite_novma(pte_mkdirty(pte))));
+	WARN_ON(pte_dirty(pte_mkwrite_novma(pte_mkclean(pte))));
+	WARN_ON(!pte_write(pte_mkdirty(pte_mkwrite_novma(pte))));
+	WARN_ON(!pte_write(pte_mkwrite_novma(pte_wrprotect(pte))));
+	WARN_ON(pte_write(pte_wrprotect(pte_mkwrite_novma(pte))));
 }
 
 static void __init pte_advanced_tests(struct pgtable_debug_args *args)
@@ -195,6 +201,13 @@ static void __init pmd_basic_tests(struct pgtable_debug_args *args, int idx)
 	WARN_ON(pmd_write(pmd_wrprotect(pmd_mkwrite(pmd, args->vma))));
 	WARN_ON(pmd_dirty(pmd_wrprotect(pmd_mkclean(pmd))));
 	WARN_ON(!pmd_dirty(pmd_wrprotect(pmd_mkdirty(pmd))));
+
+	WARN_ON(!pmd_dirty(pmd_mkwrite_novma(pmd_mkdirty(pmd))));
+	WARN_ON(pmd_dirty(pmd_mkwrite_novma(pmd_mkclean(pmd))));
+	WARN_ON(!pmd_write(pmd_mkdirty(pmd_mkwrite_novma(pmd))));
+	WARN_ON(!pmd_write(pmd_mkwrite_novma(pmd_wrprotect(pmd))));
+	WARN_ON(pmd_write(pmd_wrprotect(pmd_mkwrite_novma(pmd))));
+
 	/*
 	 * A huge page does not point to next level page table
 	 * entry. Hence this must qualify as pmd_bad().
-- 
2.30.2