On Tue, 17 Jan 2017, kwon wrote: > >> diff --git a/mm/slab_common.c b/mm/slab_common.c > >> index 1dfc209..2d30ace 100644 > >> --- a/mm/slab_common.c > >> +++ b/mm/slab_common.c > >> @@ -744,7 +744,7 @@ void kmem_cache_destroy(struct kmem_cache *s) > >> bool need_rcu_barrier = false; > >> int err; > >> > >> - if (unlikely(!s)) > >> + if (unlikely(!s) || s->refcount == -1) > >> return; > > > > Hello, Kyunghwan. > > > > Few lines below, s->refcount is checked. > > > > if (s->refcount) > > goto unlock; > > > > Am I missing something? > > > > Thanks. > > Hello, Joonsoo. > > In case it is called the number of int size times. refcount would finally > reach > to 0 since decreased every time the function called. >
The only thing using create_boot_cache() should be the slab implementation itself, so I don't think we need to protect ourselves from doing something like kmem_cache_destroy(kmem_cache) or kmem_cache_destroy(kmem_cache_node) even a single time.
