linux-kernel - [PATCH v3 12/15] mm/pte_ref: update the pmd entry in move_normal

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Message-Id: <20211110105428.32458-13-zhengqi.arch@bytedance.com>
Date:   Wed, 10 Nov 2021 18:54:25 +0800
From:   Qi Zheng <zhengqi.arch@...edance.com>
To:     akpm@...ux-foundation.org, tglx@...utronix.de,
        kirill.shutemov@...ux.intel.com, mika.penttila@...tfour.com,
        david@...hat.com, jgg@...dia.com
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, songmuchun@...edance.com,
        zhouchengming@...edance.com, Qi Zheng <zhengqi.arch@...edance.com>
Subject: [PATCH v3 12/15] mm/pte_ref: update the pmd entry in move_normal_pmd()

The ->pmd member record the pmd entry that maps the user PTE page
table page. When the pmd entry changes, ->pmd needs to be updated
synchronously.

Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
---
 mm/mremap.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/mremap.c b/mm/mremap.c
index 088a7a75cb4b..4661cdec79dc 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -278,6 +278,7 @@ static bool move_normal_pmd(struct vm_area_struct *vma, unsigned long old_addr,
 	VM_BUG_ON(!pmd_none(*new_pmd));
 
 	pmd_populate(mm, new_pmd, pmd_pgtable(pmd));
+	pte_update_pmd(pmd, new_pmd);
 	flush_tlb_range(vma, old_addr, old_addr + PMD_SIZE);
 	if (new_ptl != old_ptl)
 		spin_unlock(new_ptl);
-- 
2.11.0