X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=mm%2Frmap.c;h=cdbd31285cf670b80c4fed6bb5337bc1da7f7e7b;hb=07675d98fa2304b6c64ded1099f2b08777316241;hp=962e2a1e13a0f2a9a049c3d9a391591a4244bbdf;hpb=90804ed61f24712975fa12f8a1fc12cd46ef7d59;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

diff --git a/mm/rmap.c b/mm/rmap.c
index 962e2a1..cdbd312 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -103,6 +103,7 @@ static inline void anon_vma_free(struct anon_vma *anon_vma)
 	 * LOCK should suffice since the actual taking of the lock must
 	 * happen _before_ what follows.
 	 */
+	might_sleep();
 	if (rwsem_is_locked(&anon_vma->root->rwsem)) {
 		anon_vma_lock_write(anon_vma);
 		anon_vma_unlock_write(anon_vma);
@@ -426,8 +427,9 @@ struct anon_vma *page_get_anon_vma(struct page *page)
 	 * above cannot corrupt).
 	 */
 	if (!page_mapped(page)) {
+		rcu_read_unlock();
 		put_anon_vma(anon_vma);
-		anon_vma = NULL;
+		return NULL;
 	}
 out:
 	rcu_read_unlock();
@@ -477,9 +479,9 @@ struct anon_vma *page_lock_anon_vma_read(struct page *page)
 	}
 
 	if (!page_mapped(page)) {
+		rcu_read_unlock();
 		put_anon_vma(anon_vma);
-		anon_vma = NULL;
-		goto out;
+		return NULL;
 	}
 
 	/* we pinned the anon_vma, its safe to sleep */
@@ -848,9 +850,9 @@ out:
 static bool invalid_mkclean_vma(struct vm_area_struct *vma, void *arg)
 {
 	if (vma->vm_flags & VM_SHARED)
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
 int page_mkclean(struct page *page)
@@ -894,9 +896,9 @@ void page_move_anon_rmap(struct page *page,
 {
 	struct anon_vma *anon_vma = vma->anon_vma;
 
-	VM_BUG_ON(!PageLocked(page));
+	VM_BUG_ON_PAGE(!PageLocked(page), page);
 	VM_BUG_ON(!anon_vma);
-	VM_BUG_ON(page->index != linear_page_index(vma, address));
+	VM_BUG_ON_PAGE(page->index != linear_page_index(vma, address), page);
 
 	anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON;
 	page->mapping = (struct address_space *) anon_vma;
@@ -995,7 +997,7 @@ void do_page_add_anon_rmap(struct page *page,
 	if (unlikely(PageKsm(page)))
 		return;
 
-	VM_BUG_ON(!PageLocked(page));
+	VM_BUG_ON_PAGE(!PageLocked(page), page);
 	/* address might be in next vma when migration races vma_adjust */
 	if (first)
 		__page_set_anon_rmap(page, vma, address, exclusive);
@@ -1322,9 +1324,19 @@ static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount,
 		BUG_ON(!page || PageAnon(page));
 
 		if (locked_vma) {
-			mlock_vma_page(page);   /* no-op if already mlocked */
-			if (page == check_page)
+			if (page == check_page) {
+				/* we know we have check_page locked */
+				mlock_vma_page(page);
 				ret = SWAP_MLOCK;
+			} else if (trylock_page(page)) {
+				/*
+				 * If we can lock the page, perform mlock.
+				 * Otherwise leave the page alone, it will be
+				 * eventually encountered again later.
+				 */
+				mlock_vma_page(page);
+				unlock_page(page);
+			}
 			continue;	/* don't unmap */
 		}
 
@@ -1360,8 +1372,9 @@ static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount,
 }
 
 static int try_to_unmap_nonlinear(struct page *page,
-		struct address_space *mapping, struct vm_area_struct *vma)
+		struct address_space *mapping, void *arg)
 {
+	struct vm_area_struct *vma;
 	int ret = SWAP_AGAIN;
 	unsigned long cursor;
 	unsigned long max_nl_cursor = 0;
@@ -1481,7 +1494,7 @@ int try_to_unmap(struct page *page, enum ttu_flags flags)
 		.anon_lock = page_lock_anon_vma_read,
 	};
 
-	VM_BUG_ON(!PageHuge(page) && PageTransHuge(page));
+	VM_BUG_ON_PAGE(!PageHuge(page) && PageTransHuge(page), page);
 
 	/*
 	 * During exec, a temporary VMA is setup and later moved.
@@ -1533,7 +1546,7 @@ int try_to_munlock(struct page *page)
 
 	};
 
-	VM_BUG_ON(!PageLocked(page) || PageLRU(page));
+	VM_BUG_ON_PAGE(!PageLocked(page) || PageLRU(page), page);
 
 	ret = rmap_walk(page, &rwc);
 	return ret;
@@ -1543,10 +1556,9 @@ void __put_anon_vma(struct anon_vma *anon_vma)
 {
 	struct anon_vma *root = anon_vma->root;
 
+	anon_vma_free(anon_vma);
 	if (root != anon_vma && atomic_dec_and_test(&root->refcount))
 		anon_vma_free(root);
-
-	anon_vma_free(anon_vma);
 }
 
 static struct anon_vma *rmap_walk_anon_lock(struct page *page,
@@ -1663,7 +1675,7 @@ static int rmap_walk_file(struct page *page, struct rmap_walk_control *rwc)
 	if (list_empty(&mapping->i_mmap_nonlinear))
 		goto done;
 
-	ret = rwc->file_nonlinear(page, mapping, vma);
+	ret = rwc->file_nonlinear(page, mapping, rwc->arg);
 
 done:
 	mutex_unlock(&mapping->i_mmap_mutex);