1 files changed, 0 insertions, 45 deletions

diff --git a/mm/rmap.c b/mm/rmap.c
index 7b5b51d25fc5..8cbd62fde0f1 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -269,51 +269,6 @@ int anon_vma_clone(struct vm_area_struct *dst, struct vm_area_struct *src)
 }
 
 /*
- * Some rmap walk that needs to find all ptes/hugepmds without false
- * negatives (like migrate and split_huge_page) running concurrent
- * with operations that copy or move pagetables (like mremap() and
- * fork()) to be safe. They depend on the anon_vma "same_anon_vma"
- * list to be in a certain order: the dst_vma must be placed after the
- * src_vma in the list. This is always guaranteed by fork() but
- * mremap() needs to call this function to enforce it in case the
- * dst_vma isn't newly allocated and chained with the anon_vma_clone()
- * function but just an extension of a pre-existing vma through
- * vma_merge.
- *
- * NOTE: the same_anon_vma list can still be changed by other
- * processes while mremap runs because mremap doesn't hold the
- * anon_vma mutex to prevent modifications to the list while it
- * runs. All we need to enforce is that the relative order of this
- * process vmas isn't changing (we don't care about other vmas
- * order). Each vma corresponds to an anon_vma_chain structure so
- * there's no risk that other processes calling anon_vma_moveto_tail()
- * and changing the same_anon_vma list under mremap() will screw with
- * the relative order of this process vmas in the list, because we
- * they can't alter the order of any vma that belongs to this
- * process. And there can't be another anon_vma_moveto_tail() running
- * concurrently with mremap() coming from this process because we hold
- * the mmap_sem for the whole mremap(). fork() ordering dependency
- * also shouldn't be affected because fork() only cares that the
- * parent vmas are placed in the list before the child vmas and
- * anon_vma_moveto_tail() won't reorder vmas from either the fork()
- * parent or child.
- */
-void anon_vma_moveto_tail(struct vm_area_struct *dst)
-{
-        struct anon_vma_chain *pavc;
-        struct anon_vma *root = NULL;
-
-        list_for_each_entry_reverse(pavc, &dst->anon_vma_chain, same_vma) {
-                struct anon_vma *anon_vma = pavc->anon_vma;
-                VM_BUG_ON(pavc->vma != dst);
-                root = lock_anon_vma_root(root, anon_vma);
-                list_del(&pavc->same_anon_vma);
-                list_add_tail(&pavc->same_anon_vma, &anon_vma->head);
-        }
-        unlock_anon_vma_root(root);
-}
-
-/*
  * Attach vma to its own anon_vma, as well as to the anon_vmas that
  * the corresponding VMA in the parent process is attached to.
  * Returns 0 on success, non-zero on failure.