+ arm64-mm-standardize-printing-for-pgtable-entries.patch added to mm-new branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: arm64/mm: standardize printing for pgtable entries
has been added to the -mm mm-new branch.  Its filename is
     arm64-mm-standardize-printing-for-pgtable-entries.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/arm64-mm-standardize-printing-for-pgtable-entries.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

The mm-new branch of mm.git is not included in linux-next

If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next

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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@arm.com>
Subject: arm64/mm: standardize printing for pgtable entries
Date: Wed, 16 Sep 2026 10:19:33 +0530

Standardize printing for pgtable entries using recently introduced generic
helper ptval_bytes_to_hex_str() in core MM which automatically enables 128
bits entries when added later.

Link: https://lore.kernel.org/20260916044933.2689426-3-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
---

 arch/arm64/mm/fault.c |   16 +++++++++++-----
 arch/arm64/mm/mmu.c   |   16 ++++++++++------
 2 files changed, 21 insertions(+), 11 deletions(-)

--- a/arch/arm64/mm/fault.c~arm64-mm-standardize-printing-for-pgtable-entries
+++ a/arch/arm64/mm/fault.c
@@ -131,6 +131,7 @@ static inline unsigned long mm_to_pgd_ph
  */
 static void show_pte(unsigned long addr)
 {
+	char pxd_str[PTVAL_STR_MAX];
 	struct mm_struct *mm;
 	pgd_t *pgdp;
 	pgd_t pgd;
@@ -160,7 +161,8 @@ static void show_pte(unsigned long addr)
 
 	pgdp = pgd_offset(mm, addr);
 	pgd = READ_ONCE(*pgdp);
-	pr_alert("[%016lx] pgd=%016llx", addr, pgd_val(pgd));
+	ptval_to_str(pxd_str, pgd_val(pgd));
+	pr_alert("[%016lx] pgd=%s", addr, pxd_str);
 
 	do {
 		p4d_t *p4dp, p4d;
@@ -173,19 +175,22 @@ static void show_pte(unsigned long addr)
 
 		p4dp = p4d_offset_lockless(pgdp, pgd, addr);
 		p4d = READ_ONCE(*p4dp);
-		pr_cont(", p4d=%016llx", p4d_val(p4d));
+		ptval_to_str(pxd_str, p4d_val(p4d));
+		pr_cont(", p4d=%s", pxd_str);
 		if (p4d_none(p4d) || p4d_bad(p4d))
 			break;
 
 		pudp = pud_offset_lockless(p4dp, p4d, addr);
 		pud = READ_ONCE(*pudp);
-		pr_cont(", pud=%016llx", pud_val(pud));
+		ptval_to_str(pxd_str, pud_val(pud));
+		pr_cont(", pud=%s", pxd_str);
 		if (pud_none(pud) || pud_bad(pud))
 			break;
 
 		pmdp = pmd_offset_lockless(pudp, pud, addr);
 		pmd = READ_ONCE(*pmdp);
-		pr_cont(", pmd=%016llx", pmd_val(pmd));
+		ptval_to_str(pxd_str, pmd_val(pmd));
+		pr_cont(", pmd=%s", pxd_str);
 		if (pmd_none(pmd) || pmd_bad(pmd))
 			break;
 
@@ -194,7 +199,8 @@ static void show_pte(unsigned long addr)
 			break;
 
 		pte = __ptep_get(ptep);
-		pr_cont(", pte=%016llx", pte_val(pte));
+		ptval_to_str(pxd_str, pte_val(pte));
+		pr_cont(", pte=%s", pxd_str);
 		pte_unmap(ptep);
 	} while(0);
 
--- a/arch/arm64/mm/mmu.c~arm64-mm-standardize-printing-for-pgtable-entries
+++ a/arch/arm64/mm/mmu.c
@@ -2411,6 +2411,8 @@ int arch_set_user_pkey_access(int pkey,
 #ifdef CONFIG_DEBUG_VM
 void __check_safe_pte_update(struct mm_struct *mm, pte_t *ptep, pte_t pte)
 {
+	char pte_str_old[PTVAL_STR_MAX];
+	char pte_str[PTVAL_STR_MAX];
 	pte_t old_pte;
 
 	old_pte = __ptep_get(ptep);
@@ -2425,15 +2427,17 @@ void __check_safe_pte_update(struct mm_s
 	 * (__ptep_set_access_flags safely changes valid ptes without going
 	 * through an invalid entry).
 	 */
+	ptval_to_str(pte_str, pte_val(pte));
+	ptval_to_str(pte_str_old, pte_val(old_pte));
 	VM_WARN_ONCE(!pte_young(pte),
-		     "%s: racy access flag clearing: 0x%016llx -> 0x%016llx",
-		     __func__, pte_val(old_pte), pte_val(pte));
+		     "%s: racy access flag clearing: %s -> %s",
+		     __func__, pte_str_old, pte_str);
 	VM_WARN_ONCE(pte_write(old_pte) && !pte_dirty(pte),
-		     "%s: racy dirty state clearing: 0x%016llx -> 0x%016llx",
-		     __func__, pte_val(old_pte), pte_val(pte));
+		     "%s: racy dirty state clearing: %s -> %s",
+		     __func__, pte_str_old, pte_str);
 	VM_WARN_ONCE(!pgattr_change_is_safe(pte_val(old_pte), pte_val(pte)),
-		     "%s: unsafe attribute change: 0x%016llx -> 0x%016llx",
-		     __func__, pte_val(old_pte), pte_val(pte));
+		     "%s: unsafe attribute change: %s -> %s",
+		     __func__, pte_str_old, pte_str);
 }
 #endif /* CONFIG_DEBUG_VM */
 #endif
_

Patches currently in -mm which might be from anshuman.khandual@arm.com are

mm-make-ptval_to_str-generally-available.patch
mm-stop-using-pxd_error.patch
loongarch-mm-stop-using-pte_error.patch
parisc-mm-directly-use-generic-_clear_bad.patch
sh-mm-stop-using-pte_error.patch
sh-mm-stop-using-_error.patch
sh-mm-stop-using-pgd_error.patch
mm-drop-pxd_error.patch
mm-constify-arguments-in-default-pxdp_get.patch
arm64-mm-move-__check_safe_pte_update.patch
arm64-mm-standardize-printing-for-pgtable-entries.patch