[PATCH v2 09/10] mm/vma: Use unmap_region() in vms_clear_ptes()

["Liam R. Howlett" <Liam.Howlett@oracle.com>]

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@oracle.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