Hello, Minchan. On Mon, Jul 23, 2012 at 01:58:55PM +0900, Minchan Kim wrote: > I would like to know what fields you are concerning because most of field The above question itself is a problem. It's subtle to hell. Some fields of this data structure is used during early boot but at some point all are reset to zero, so we have to be careful about how those fields are used before and after. This might seem clear now but things like this are likely to make people later working on the code go WTF. Let's say for whatever reason ->bdata needs to be accessed after free_area_init - e.g. arch_add_memory() needs some info from bdata, what then? What if we end up having to add a new property field which is determined by platform code but used by generic code. I would add a field to pgdat, init it from numa.c and then later use it in generic code. If the field gets zeroed inbetween, I would get pretty annoyed. I really don't think this subject is worth the amount of discussion we had in this thread. Just make the archs clear the data structure on creation. Anything else is silly. Thanks. -- tejun -- 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>