@@ -646,6 +646,26 @@ void vma_complete(struct vma_prepare *vp,
uprobe_mmap(vp->insert);
}
+static void vms_complete_pte_clear(struct vma_munmap_struct *vms,
+ struct ma_state *mas_detach, bool mm_wr_locked)
+{
+ struct mmu_gather tlb;
+
+ /*
+ * We can free page tables without write-locking mmap_lock because VMAs
+ * were isolated before we downgraded mmap_lock.
+ */
+ mas_set(mas_detach, 1);
+ lru_add_drain();
+ tlb_gather_mmu(&tlb, vms->mm);
+ update_hiwater_rss(vms->mm);
+ unmap_vmas(&tlb, mas_detach, vms->vma, vms->start, vms->end, vms->vma_count, mm_wr_locked);
+ 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, mm_wr_locked);
+ tlb_finish_mmu(&tlb);
+}
+
/*
* vms_complete_munmap_vmas() - Finish the munmap() operation
* @vms: The vma munmap struct
@@ -667,13 +687,7 @@ void vms_complete_munmap_vmas(struct vma_munmap_struct *vms,
if (vms->unlock)
mmap_write_downgrade(mm);
- /*
- * We can free page tables without write-locking mmap_lock because VMAs
- * were isolated before we downgraded mmap_lock.
- */
- mas_set(mas_detach, 1);
- unmap_region(mm, mas_detach, vms->vma, vms->prev, vms->next,
- vms->start, vms->end, vms->vma_count, !vms->unlock);
+ vms_complete_pte_clear(vms, mas_detach, !vms->unlock);
/* Update high watermark before we lower total_vm */
update_hiwater_vm(mm);
/* Stat accounting */
@@ -741,6 +755,8 @@ int vms_gather_munmap_vmas(struct vma_munmap_struct *vms,
goto start_split_failed;
}
vms->prev = vma_prev(vms->vmi);
+ if (vms->prev)
+ vms->unmap_start = vms->prev->vm_end;
/*
* Detach a range of VMAs from the mm. Using next as a temp variable as
@@ -808,6 +824,8 @@ int vms_gather_munmap_vmas(struct vma_munmap_struct *vms,
}
vms->next = vma_next(vms->vmi);
+ if (vms->next)
+ vms->unmap_end = vms->next->vm_start;
#if defined(CONFIG_DEBUG_VM_MAPLE_TREE)
/* Make sure no VMAs are about to be lost. */
@@ -38,6 +38,8 @@ struct vma_munmap_struct {
struct list_head *uf; /* Userfaultfd list_head */
unsigned long start; /* Aligned start addr (inclusive) */
unsigned long end; /* Aligned end addr (exclusive) */
+ unsigned long unmap_start; /* Unmap PTE start */
+ unsigned long unmap_end; /* Unmap PTE end */
int vma_count; /* Number of vmas that will be removed */
unsigned long nr_pages; /* Number of pages being removed */
unsigned long locked_vm; /* Number of locked pages */
@@ -108,6 +110,8 @@ static inline void init_vma_munmap(struct vma_munmap_struct *vms,
vms->vma_count = 0;
vms->nr_pages = vms->locked_vm = vms->nr_accounted = 0;
vms->exec_vm = vms->stack_vm = vms->data_vm = 0;
+ vms->unmap_start = FIRST_USER_ADDRESS;
+ vms->unmap_end = USER_PGTABLES_CEILING;
}
int vms_gather_munmap_vmas(struct vma_munmap_struct *vms,