5 files changed, 10 insertions, 4 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index b0ceb29da4c7..e8644b1e5527 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -7,7 +7,7 @@
 
 int bdi_init(struct backing_dev_info *bdi)
 {
-	int i, j;
+	int i;
 	int err;
 
 	for (i = 0; i < NR_BDI_STAT_ITEMS; i++) {
@@ -21,7 +21,7 @@ int bdi_init(struct backing_dev_info *bdi)
 
 	if (err) {
 err:
-		for (j = 0; j < i; j++)
+		while (i--)
 			percpu_counter_destroy(&bdi->bdi_stat[i]);
 	}
 
diff --git a/mm/filemap_xip.c b/mm/filemap_xip.c
index 32132f3cd641..e233fff61b4b 100644
--- a/mm/filemap_xip.c
+++ b/mm/filemap_xip.c
@@ -314,7 +314,7 @@ __xip_file_write(struct file *filp, const char __user *buf,
 		fault_in_pages_readable(buf, bytes);
 		kaddr = kmap_atomic(page, KM_USER0);
 		copied = bytes -
-			__copy_from_user_inatomic_nocache(kaddr, buf, bytes);
+			__copy_from_user_inatomic_nocache(kaddr + offset, buf, bytes);
 		kunmap_atomic(kaddr, KM_USER0);
 		flush_dcache_page(page);
 
diff --git a/mm/slab.c b/mm/slab.c
index 202465a193c1..2e338a5f7b14 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -4475,3 +4475,4 @@ size_t ksize(const void *objp)
 
 	return obj_size(virt_to_cache(objp));
 }
+EXPORT_SYMBOL(ksize);
diff --git a/mm/slob.c b/mm/slob.c
index 08a9bd91a1aa..ee2ef8af0d43 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -495,6 +495,7 @@ size_t ksize(const void *block)
 	else
 		return sp->page.private;
 }
+EXPORT_SYMBOL(ksize);
 
 struct kmem_cache {
 	unsigned int size, align;
diff --git a/mm/slub.c b/mm/slub.c
index 9acb413858ac..b9f37cb0f2e6 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2558,8 +2558,12 @@ size_t ksize(const void *object)
 	if (unlikely(object == ZERO_SIZE_PTR))
 		return 0;
 
-	page = get_object_page(object);
+	page = virt_to_head_page(object);
 	BUG_ON(!page);
+
+	if (unlikely(!PageSlab(page)))
+		return PAGE_SIZE << compound_order(page);
+
 	s = page->slab;
 	BUG_ON(!s);