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.

Link: https://lkml.kernel.org/r/20260121164946.2093480-11-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Chris Li <chrisl@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jann Horn <jannh@google.com>
Cc: Kairui Song <kasong@tencent.com>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Pedro Falcato <pfalcato@suse.de>
Cc: SeongJae Park <sj@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 1 insertions, 13 deletions

diff --git a/mm/vma.c b/mm/vma.c
index b46c869d4bb0..876d2db5329d 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;
 }