[RFC PATCH 5/6] mm/vma: Add page table limit to unmap_region()

[Liam R. Howlett]

The unmap_region() calls need to pass through the page table limit for a
future patch.

No functional changes intended.

Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
---
 mm/vma.c | 5 +++--
 mm/vma.h | 2 +-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/mm/vma.c b/mm/vma.c
index aa75ca8618609..39f3b55a020b2 100644
--- a/mm/vma.c
+++ b/mm/vma.c
@@ -474,7 +474,7 @@ void remove_vma(struct vm_area_struct *vma)
  * Called with the mm semaphore held.
  */
 void unmap_region(struct ma_state *mas, struct vm_area_struct *vma,
-		unsigned long vma_min, unsigned long vma_max,
+		unsigned long vma_min, unsigned long vma_max, unsigned long pg_max,
 		struct vm_area_struct *prev, struct vm_area_struct *next)
 {
 	struct mm_struct *mm = vma->vm_mm;
@@ -487,7 +487,7 @@ void unmap_region(struct ma_state *mas, struct vm_area_struct *vma,
 	mas_set(mas, vma->vm_end);
 	free_pgtables(&tlb, mas, vma, prev ? prev->vm_end : FIRST_USER_ADDRESS,
 		      next ? next->vm_start : USER_PGTABLES_CEILING,
-		      next ? next->vm_start : USER_PGTABLES_CEILING,
+		      pg_max,
 		      /* mm_wr_locked = */ true);
 	tlb_finish_mmu(&tlb);
 }
@@ -2420,6 +2420,7 @@ static int __mmap_new_file_vma(struct mmap_state *map,
 		vma_iter_set(vmi, vma->vm_end);
 		/* Undo any partial mapping done by a device driver. */
 		unmap_region(&vmi->mas, vma, vma->vm_start, vma->vm_end,
+			     map->next ? map->next->vm_start : USER_PGTABLES_CEILING,
 			     map->prev, map->next);
 
 		return error;
diff --git a/mm/vma.h b/mm/vma.h
index 336dae295853e..ba203c0c1d89d 100644
--- a/mm/vma.h
+++ b/mm/vma.h
@@ -281,7 +281,7 @@ int do_vmi_munmap(struct vma_iterator *vmi, struct mm_struct *mm,
 void remove_vma(struct vm_area_struct *vma);
 
 void unmap_region(struct ma_state *mas, struct vm_area_struct *vma,
-		unsigned long min, unsigned long max,
+		unsigned long min, unsigned long max, unsigned long pg_max,
 		struct vm_area_struct *prev, struct vm_area_struct *next);
 
 /* We are about to modify the VMA's flags. */
-- 
2.47.2