From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f69.google.com (mail-pa0-f69.google.com [209.85.220.69]) by kanga.kvack.org (Postfix) with ESMTP id 2B9D46B007E for ; Thu, 9 Jun 2016 19:37:21 -0400 (EDT) Received: by mail-pa0-f69.google.com with SMTP id ug1so74631304pab.3 for ; Thu, 09 Jun 2016 16:37:21 -0700 (PDT) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org. [140.211.169.12]) by mx.google.com with ESMTPS id e1si9939971pfa.186.2016.06.09.16.37.20 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 09 Jun 2016 16:37:20 -0700 (PDT) Date: Thu, 9 Jun 2016 16:37:19 -0700 From: Andrew Morton Subject: Re: [PATCH] mm: fix build warnings in Message-Id: <20160609163719.5af286badfa9b5314700fece@linux-foundation.org> In-Reply-To: <20160609233143.GC29779@bbox> References: <5759A1F9.2070302@infradead.org> <20160609152716.1093ada2f52bbcc426e6ddb6@linux-foundation.org> <20160609233143.GC29779@bbox> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Minchan Kim Cc: Randy Dunlap , Linux MM , "linux-next@vger.kernel.org" , Stephen Rothwell On Fri, 10 Jun 2016 08:31:43 +0900 Minchan Kim wrote: > 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 wrote: > > > > > From: Randy Dunlap > > > > > > 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. If we're going to convert compaction.h to be standalone then it will need to include a whole bunch of things - what's special about node.h? > So, I prefer Randy's fix. Doesn't matter much. But note that Randy's patch declared struct node at line 233. It should be sone at approximatley line 1, to prevent future duplicated declarations. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org