On Wed, 26 Sep 2012, Christoph Lameter wrote: > > Nack, this is already handled by CREATE_MASK in the mm/slab.c allocator; > > CREATE_MASK defines legal flags that can be specified. Other flags cause > and error. This is about flags that are internal that should be ignored > when specified. > That should be ignored for the mm/slab.c allocator, yes. > I think it makes sense to reserve some top flags for internal purposes. > It depends on the implementation: if another slab allocator were to use additional bits that would be a no-op with mm/slab.c, then this patch would be too restrictive. There's also no requirement that any "internal flags" reserved by a slab allocator implementation must be shared in the same kmem_cache field as the flags passed to kmem_cache_create() -- it's actually better if they aren't since they seldom need to be accessed in the same cacheline. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>