linux-kernel - [PATCH v4 2/5] arm64: mm: factor out the address and ptep alignment into a new helper

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Message-ID: <47e29030347c23ffce238ff5ed752da01a8cc7cb.1766455378.git.baolin.wang@linux.alibaba.com>
Date: Tue, 23 Dec 2025 13:48:36 +0800
From: Baolin Wang <baolin.wang@...ux.alibaba.com>
To: akpm@...ux-foundation.org,
	david@...nel.org,
	catalin.marinas@....com,
	will@...nel.org
Cc: lorenzo.stoakes@...cle.com,
	ryan.roberts@....com,
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	dev.jain@....com,
	baolin.wang@...ux.alibaba.com,
	linux-mm@...ck.org,
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Subject: [PATCH v4 2/5] arm64: mm: factor out the address and ptep alignment into a new helper

Factor out the contpte block's address and ptep alignment into a new helper,
and will be reused in the following patch.

No functional changes.

Signed-off-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
---
 arch/arm64/mm/contpte.c | 29 +++++++++++++++++++++--------
 1 file changed, 21 insertions(+), 8 deletions(-)

diff --git a/arch/arm64/mm/contpte.c b/arch/arm64/mm/contpte.c
index 589bcf878938..e4ddeb46f25d 100644
--- a/arch/arm64/mm/contpte.c
+++ b/arch/arm64/mm/contpte.c
@@ -26,6 +26,26 @@ static inline pte_t *contpte_align_down(pte_t *ptep)
 	return PTR_ALIGN_DOWN(ptep, sizeof(*ptep) * CONT_PTES);
 }
 
+static inline pte_t *contpte_align_addr_ptep(unsigned long *start,
+					     unsigned long *end, pte_t *ptep,
+					     unsigned int nr)
+{
+	/*
+	 * Note: caller must ensure these nr PTEs are consecutive (present)
+	 * PTEs that map consecutive pages of the same large folio within a
+	 * single VMA and a single page table.
+	 */
+	if (pte_cont(__ptep_get(ptep + nr - 1)))
+		*end = ALIGN(*end, CONT_PTE_SIZE);
+
+	if (pte_cont(__ptep_get(ptep))) {
+		*start = ALIGN_DOWN(*start, CONT_PTE_SIZE);
+		ptep = contpte_align_down(ptep);
+	}
+
+	return ptep;
+}
+
 static void contpte_try_unfold_partial(struct mm_struct *mm, unsigned long addr,
 					pte_t *ptep, unsigned int nr)
 {
@@ -569,14 +589,7 @@ void contpte_clear_young_dirty_ptes(struct vm_area_struct *vma,
 	unsigned long start = addr;
 	unsigned long end = start + nr * PAGE_SIZE;
 
-	if (pte_cont(__ptep_get(ptep + nr - 1)))
-		end = ALIGN(end, CONT_PTE_SIZE);
-
-	if (pte_cont(__ptep_get(ptep))) {
-		start = ALIGN_DOWN(start, CONT_PTE_SIZE);
-		ptep = contpte_align_down(ptep);
-	}
-
+	ptep = contpte_align_addr_ptep(&start, &end, ptep, nr);
 	__clear_young_dirty_ptes(vma, start, ptep, (end - start) / PAGE_SIZE, flags);
 }
 EXPORT_SYMBOL_GPL(contpte_clear_young_dirty_ptes);
-- 
2.47.3