diff --git a/mm/slab.c b/mm/slab.c
index ddc41f337d587750122f54a44806a8a29a0a67c2..4d00855629c4921e3c590406335549683e6c6daf 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -4457,3 +4457,4 @@ 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 bf7e8fc3aed806542e44cc7b1d222d9e2b56dc3a..52bc8a2bd9efe71b0df16d068abcefe282a3dfc1 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -521,6 +521,7 @@ 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 bdc9abb08a230f2724ad842a0bc4928da0e48d23..0280eee6cf3768479760e6e564e9364d6a83e346 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2736,6 +2736,7 @@ size_t ksize(const void *object)
 	 */
 	return s->size;
 }
+EXPORT_SYMBOL(ksize);
 
 void kfree(const void *x)
 {