Hey, This is v4 which allows NULL to be passed in the struct kmem_cache_args argument of kmem_cache_create() and substitutes default parameters in this case. As discussed last week the various kmem_cache_*() functions should be replaced by a unified function that is based around a struct, with only the basic parameters passed separately. Vlastimil already said that he would like to keep core parameters out of the struct: name, object size, and flags. I personally don't care much and would not object to moving everything into the struct but that's a matter of taste and I yield that decision power to the maintainer. In the first version I pointed out that the choice of name is somewhat forced as kmem_cache_create() is taken and the only way to reuse it would be to replace all users in one go. Or to do a global sed/kmem_cache_create()/kmem_cache_create2()/g. And then introduce kmem_cache_setup(). That doesn't strike me as a viable option. If we really cared about the *_create() suffix then an alternative might be to do a sed/kmem_cache_setup()/kmem_cache_create()/g after every user in the kernel is ported. I honestly don't think that's worth it but I wanted to at least mention it to highlight the fact that this might lead to a naming compromise. However, I came up with an alternative using _Generic() to create a compatibility layer that will call the correct variant of kmem_cache_create() depending on whether struct kmem_cache_args is passed or not. That compatibility layer can stay in place until we updated all calls to be based on struct kmem_cache_args.
