On Wed, Jan 10, 2018 at 12:28:23PM -0600, Christopher Lameter wrote: > On Tue, 9 Jan 2018, Kees Cook wrote: > > +struct kmem_cache *kmem_cache_create_usercopy(const char *name, > > + size_t size, size_t align, slab_flags_t flags, > > + size_t useroffset, size_t usersize, > > + void (*ctor)(void *)); > > Hmmm... At some point we should switch kmem_cache_create to pass a struct > containing all the parameters. Otherwise the API will blow up with > additional functions. Obviously I agree with you. I'm inclined to not let that delay Kees' patches; we can fix the few places that use this API later. At this point, my proposal for the ultimate form would be: struct kmem_cache_attr { const char name[32]; void (*ctor)(void *); unsigned int useroffset; unsigned int user_size; }; kmem_create_cache_attr(const struct kmem_cache_attr *attr, unsigned int size, unsigned int align, slab_flags_t flags) (my rationale is that everything in attr should be const, but size, align and flags all get modified by the slab code).