X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=mm%2Frmap.c;h=f6f0d2dda2eae8480860cf57f5a9cfce69820716;hb=f18194275c39835cb84563500995e0d503a32d9a;hp=87b9e8ad450962afa1159b763f0aa0a977ab9a88;hpb=d4348c678977c7093438bbbf2067c49396ae941b;p=mv-sheeva.git

diff --git a/mm/rmap.c b/mm/rmap.c
index 87b9e8ad450..f6f0d2dda2e 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -316,7 +316,7 @@ void __init anon_vma_init(void)
  */
 struct anon_vma *page_lock_anon_vma(struct page *page)
 {
-	struct anon_vma *anon_vma;
+	struct anon_vma *anon_vma, *root_anon_vma;
 	unsigned long anon_mapping;
 
 	rcu_read_lock();
@@ -327,8 +327,21 @@ struct anon_vma *page_lock_anon_vma(struct page *page)
 		goto out;
 
 	anon_vma = (struct anon_vma *) (anon_mapping - PAGE_MAPPING_ANON);
-	anon_vma_lock(anon_vma);
-	return anon_vma;
+	root_anon_vma = ACCESS_ONCE(anon_vma->root);
+	spin_lock(&root_anon_vma->lock);
+
+	/*
+	 * If this page is still mapped, then its anon_vma cannot have been
+	 * freed.  But if it has been unmapped, we have no security against
+	 * the anon_vma structure being freed and reused (for another anon_vma:
+	 * SLAB_DESTROY_BY_RCU guarantees that - so the spin_lock above cannot
+	 * corrupt): with anon_vma_prepare() or anon_vma_fork() redirecting
+	 * anon_vma->root before page_unlock_anon_vma() is called to unlock.
+	 */
+	if (page_mapped(page))
+		return anon_vma;
+
+	spin_unlock(&root_anon_vma->lock);
 out:
 	rcu_read_unlock();
 	return NULL;