* Matthew Wilcox <willy@xxxxxxxxxxxxx> [240808 15:15]: > On Thu, Aug 08, 2024 at 12:29:59PM -0400, Sidhartha Kumar wrote: > > diff --git a/lib/maple_tree.c b/lib/maple_tree.c > > index aa3a5df15b8e..65fba37ef999 100644 > > --- a/lib/maple_tree.c > > +++ b/lib/maple_tree.c > > @@ -6997,6 +6997,18 @@ void mt_set_non_kernel(unsigned int val) > > kmem_cache_set_non_kernel(maple_node_cache, val); > > } > > > > +extern void kmem_cache_set_callback(struct kmem_cache *cachep, void (*callback)(void *)); > > +void mt_set_callback(void (*callback)(void *)) > > +{ > > + kmem_cache_set_callback(maple_node_cache, callback); > > +} > > + > > +extern void kmem_cache_set_private(struct kmem_cache *cachep, void *private); > > +void mt_set_private(void *private) > > +{ > > + kmem_cache_set_private(maple_node_cache, private); > > +} > > + > > extern unsigned long kmem_cache_get_alloc(struct kmem_cache *); > > unsigned long mt_get_alloc_size(void) > > { > > This should surely not be in lib/maple_tree.c ... > It has to be as it uses the kmem_cache maple_node_cache reference. It is located in an ifndef __KERNEL__ and an ifdef CONFIG_DEBUG_MAPLE_TREE, so it won't be in any kernel builds.