linux-kernel - [PATCH] mm/debug_vm_pgtable: Add [pte|pmd]_mkwrite

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Message-Id: <20251021024424.2390325-1-anshuman.khandual@arm.com>
Date: Tue, 21 Oct 2025 03:44:24 +0100
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-mm@...ck.org
Cc: Anshuman Khandual <anshuman.khandual@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...hat.com>,
	Huang Ying <ying.huang@...ux.alibaba.com>,
	linux-kernel@...r.kernel.org,
	Catalin Marinas <catalin.marinas@....com>
Subject: [PATCH] mm/debug_vm_pgtable: Add [pte|pmd]_mkwrite_novma() tests

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

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: David Hildenbrand <david@...hat.com>
Cc: Huang Ying <ying.huang@...ux.alibaba.com>
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
Suggested-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
These tests clear on arm64 platform after the following recent patch.

https://lore.kernel.org/all/20251015023712.46598-1-ying.huang@linux.alibaba.com/

 mm/debug_vm_pgtable.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
index 830107b6dd08..b9cae1580782 100644
--- a/mm/debug_vm_pgtable.c
+++ b/mm/debug_vm_pgtable.c
@@ -102,6 +102,11 @@ 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_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 +200,11 @@ 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_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