On Thu, 6 May 2010, Minchan Kim wrote: > > + */ > > + avc = list_first_entry(&anon_vma->head, struct anon_vma_chain, same_anon_vma); > > Dumb question. > > I can't understand why we should use list_first_entry. It's not that we "should" use list_entry_first. It's that we want to find _any_ entry on the list, and the most natural one is the first one. So we could take absolutely any 'avc' entry that is reachable from the anon_vma, and use that to look up _any_ 'vma' that is associated with that anon_vma. And then, from _any_ of those vma's, we know how to get to the "root anon_vma" - the one that they are all associated with. So no, there's absolutely nothing special about the first entry. It's just a random easily found one. Linus -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>