From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752987AbaBTBxY (ORCPT ); Wed, 19 Feb 2014 20:53:24 -0500 Received: from e39.co.us.ibm.com ([32.97.110.160]:45913 "EHLO e39.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750846AbaBTBxW (ORCPT ); Wed, 19 Feb 2014 20:53:22 -0500 Date: Wed, 19 Feb 2014 17:53:17 -0800 From: "Paul E. McKenney" To: Paul Gortmaker Cc: Dipankar Sarma , linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] rcu: ensure kernel/rcu/rcu.h can be sourced/used stand-alone Message-ID: <20140220015317.GL4250@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20140219185850.GA23050@linux.vnet.ibm.com> <1392838407-29704-1-git-send-email-paul.gortmaker@windriver.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1392838407-29704-1-git-send-email-paul.gortmaker@windriver.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 14022001-9332-0000-0000-00000329FB33 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Feb 19, 2014 at 02:33:27PM -0500, Paul Gortmaker wrote: > The kbuild test bot uncovered an implicit dependence on the > trace header being present before rcu.h in ia64 allmodconfig > that looks like this: > > In file included from kernel/ksysfs.c:22:0: > kernel/rcu/rcu.h: In function '__rcu_reclaim': > kernel/rcu/rcu.h:107:3: error: implicit declaration of function 'trace_rcu_invoke_kfree_callback' [-Werror=implicit-function-declaration] > kernel/rcu/rcu.h:112:3: error: implicit declaration of function 'trace_rcu_invoke_callback' [-Werror=implicit-function-declaration] > cc1: some warnings being treated as errors > > Looking at other rcu.h users, we can find that they all > were sourcing the trace header in advance of rcu.h itself, > as seen in the context of this diff. There were also some > inconsistencies as to whether it was or wasn't sourced based > on the parent tracing Kconfig. > > Rather than "fix" it at each use site, and have inconsistent > use based on whether "#ifdef CONFIG_RCU_TRACE" was used or not, > lets just source the trace header just once, in the actual consumer > of it, which is rcu.h itself. We include it unconditionally, as > build testing shows us that is a hard requirement for some files. > > Reported-by: kbuild test robot > Signed-off-by: Paul Gortmaker Queued for 3.16, thank you, Paul! Thanx, Paul > --- > > [v2: move the #include outside of the scope > of #ifdef CONFIG_RCU_TRACE so it is unconditionally included.] > > kernel/rcu/rcu.h | 1 + > kernel/rcu/srcu.c | 2 -- > kernel/rcu/tiny.c | 4 ---- > kernel/rcu/tree.c | 2 -- > kernel/rcu/update.c | 1 - > 5 files changed, 1 insertion(+), 9 deletions(-) > > diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h > index 1bd787fddcb2..3d2a037332b2 100644 > --- a/kernel/rcu/rcu.h > +++ b/kernel/rcu/rcu.h > @@ -23,6 +23,7 @@ > #ifndef __LINUX_RCU_H > #define __LINUX_RCU_H > > +#include > #ifdef CONFIG_RCU_TRACE > #define RCU_TRACE(stmt) stmt > #else /* #ifdef CONFIG_RCU_TRACE */ > diff --git a/kernel/rcu/srcu.c b/kernel/rcu/srcu.c > index 5db7e9272d37..8e66b05bfd82 100644 > --- a/kernel/rcu/srcu.c > +++ b/kernel/rcu/srcu.c > @@ -36,8 +36,6 @@ > #include > #include > > -#include > - > #include "rcu.h" > > /* > diff --git a/kernel/rcu/tiny.c b/kernel/rcu/tiny.c > index 53b95bbf4abb..d9efcc13008c 100644 > --- a/kernel/rcu/tiny.c > +++ b/kernel/rcu/tiny.c > @@ -37,10 +37,6 @@ > #include > #include > > -#ifdef CONFIG_RCU_TRACE > -#include > -#endif /* #else #ifdef CONFIG_RCU_TRACE */ > - > #include "rcu.h" > > /* Forward declarations for tiny_plugin.h. */ > diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c > index c7a00dbe768b..351faba48b91 100644 > --- a/kernel/rcu/tree.c > +++ b/kernel/rcu/tree.c > @@ -58,8 +58,6 @@ > #include > > #include "tree.h" > -#include > - > #include "rcu.h" > > MODULE_ALIAS("rcutree"); > diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c > index fd0d5b5b8e7c..4c0a9b0af469 100644 > --- a/kernel/rcu/update.c > +++ b/kernel/rcu/update.c > @@ -49,7 +49,6 @@ > #include > > #define CREATE_TRACE_POINTS > -#include > > #include "rcu.h" > > -- > 1.8.5.2 >