Hi Andrew, On Thu, Jun 09, 2016 at 03:27:16PM -0700, Andrew Morton wrote: > On Thu, 9 Jun 2016 10:06:01 -0700 Randy Dunlap <rdunlap@xxxxxxxxxxxxx> wrote: > > > From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> > > > > Fix build warnings when struct node is not defined: > > > > In file included from ../include/linux/balloon_compaction.h:48:0, > > from ../mm/balloon_compaction.c:11: > > ../include/linux/compaction.h:237:51: warning: 'struct node' declared inside parameter list [enabled by default] > > static inline int compaction_register_node(struct node *node) > > ../include/linux/compaction.h:237:51: warning: its scope is only this definition or declaration, which is probably not what you want [enabled by default] > > ../include/linux/compaction.h:242:54: warning: 'struct node' declared inside parameter list [enabled by default] > > static inline void compaction_unregister_node(struct node *node) > > > > ... > > > > --- linux-next-20160609.orig/include/linux/compaction.h > > +++ linux-next-20160609/include/linux/compaction.h > > @@ -233,6 +233,7 @@ extern int compaction_register_node(stru > > extern void compaction_unregister_node(struct node *node); > > > > #else > > +struct node; > > > > static inline int compaction_register_node(struct node *node) > > { > > Well compaction.h has no #includes at all and obviously depends on its > including file(s) to bring in the definitions which it needs. > > So if we want to keep that (odd) model then we should fix > mm-balloon-use-general-non-lru-movable-page-feature.patch thusly: How about fixing such odd model in this chance? Otherwise, every non-lru page migration driver should include both compaction.h and node.h which is weired to me. :( I think there are two ways. 1. compaction.h include node.h directly so user of compaction.h don't need to take care about node.h 2. Randy's fix I looked up who use compaction_[un]register_node and found it's used only drivers/base/node.c which already include node.h so no problem. 1) I believe it's rare those functions to be needed by other files. 2) Those functions works if CONFIG_NUMA as well as CONFIG_COMPACTION which is rare configuration for many not-server system. So, I prefer Randy's fix. -- 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>