linux-kernel - [PATCH v2 09/10] mm/vma: Use unmap_region() in vms_clear

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Message-ID: <20260115182720.1691130-10-Liam.Howlett@oracle.com>
Date: Thu, 15 Jan 2026 13:27:19 -0500
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Suren Baghdasaryan <surenb@...gle.com>,
        Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
        Pedro Falcato <pfalcato@...e.de>, David Hildenbrand <david@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>, Michal Hocko <mhocko@...e.com>,
        Jann Horn <jannh@...gle.com>, shikemeng@...weicloud.com,
        kasong@...cent.com, nphamcs@...il.com, bhe@...hat.com,
        baohua@...nel.org, chrisl@...nel.org,
        Matthew Wilcox <willy@...radead.org>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>
Subject: [PATCH v2 09/10] mm/vma: Use unmap_region() in vms_clear_ptes()

There is no need to open code the vms_clear_ptes() now that unmap_desc
struct is used.

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 mm/vma.c | 14 +-------------
 1 file changed, 1 insertion(+), 13 deletions(-)

diff --git a/mm/vma.c b/mm/vma.c
index b46c869d4bb07..876d2db5329dd 100644
--- a/mm/vma.c
+++ b/mm/vma.c
@@ -1255,7 +1255,6 @@ int vma_shrink(struct vma_iterator *vmi, struct vm_area_struct *vma,
 static inline void vms_clear_ptes(struct vma_munmap_struct *vms,
 		    struct ma_state *mas_detach, bool mm_wr_locked)
 {
-	struct mmu_gather tlb;
 	struct unmap_desc unmap = {
 		.mas = mas_detach,
 		.first = vms->vma,
@@ -1280,19 +1279,8 @@ static inline void vms_clear_ptes(struct vma_munmap_struct *vms,
 	if (!vms->clear_ptes) /* Nothing to do */
 		return;
 
-	/*
-	 * We can free page tables without write-locking mmap_lock because VMAs
-	 * were isolated before we downgraded mmap_lock.
-	 */
 	mas_set(mas_detach, 1);
-	tlb_gather_mmu(&tlb, vms->vma->vm_mm);
-	update_hiwater_rss(vms->vma->vm_mm);
-	unmap_vmas(&tlb, &unmap);
-	mas_set(mas_detach, 1);
-	/* start and end may be different if there is no prev or next vma. */
-	free_pgtables(&tlb, mas_detach, vms->vma, vms->unmap_start,
-		      vms->unmap_end, vms->unmap_end, mm_wr_locked);
-	tlb_finish_mmu(&tlb);
+	unmap_region(&unmap);
 	vms->clear_ptes = false;
 }
 
-- 
2.47.3