[PATCH] mm/vma: correct legacy comment in vm_[un]lock_anon_vma()

[Wei Yang <richard.weiyang@gmail.com>]

In commit bf181b9f9d8d ("mm anon rmap: replace same_anon_vma linked
list with an interval tree."), the anon_vma.same_anon_vma is replaced by
interval tree.

But the related comment is left behind. Correct it here.

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Jann Horn <jannh@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Michel Lespinasse <michel@lespinasse.org>
---
 mm/vma.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/mm/vma.c b/mm/vma.c
index 5cdc5612bfc1..1a155031f1fb 100644
--- a/mm/vma.c
+++ b/mm/vma.c
@@ -1989,16 +1989,16 @@ static void vm_lock_anon_vma(struct mm_struct *mm, struct anon_vma *anon_vma)
 {
 	if (!test_bit(0, (unsigned long *) &anon_vma->root->rb_root.rb_root.rb_node)) {
 		/*
-		 * The LSB of head.next can't change from under us
+		 * The LSB of rb_root.rb_node can't change from under us
 		 * because we hold the mm_all_locks_mutex.
 		 */
 		down_write_nest_lock(&anon_vma->root->rwsem, &mm->mmap_lock);
 		/*
-		 * We can safely modify head.next after taking the
+		 * We can safely modify rb_root.rb_node after taking the
 		 * anon_vma->root->rwsem. If some other vma in this mm shares
 		 * the same anon_vma we won't take it again.
 		 *
-		 * No need of atomic instructions here, head.next
+		 * No need of atomic instructions here, rb_root.rb_node
 		 * can't change from under us thanks to the
 		 * anon_vma->root->rwsem.
 		 */
@@ -2124,14 +2124,14 @@ static void vm_unlock_anon_vma(struct anon_vma *anon_vma)
 {
 	if (test_bit(0, (unsigned long *) &anon_vma->root->rb_root.rb_root.rb_node)) {
 		/*
-		 * The LSB of head.next can't change to 0 from under
+		 * The LSB of rb_root.rb_node can't change to 0 from under
 		 * us because we hold the mm_all_locks_mutex.
 		 *
 		 * We must however clear the bitflag before unlocking
 		 * the vma so the users using the anon_vma->rb_root will
 		 * never see our bitflag.
 		 *
-		 * No need of atomic instructions here, head.next
+		 * No need of atomic instructions here, rb_root.rb_node
 		 * can't change from under us until we release the
 		 * anon_vma->root->rwsem.
 		 */
-- 
2.34.1