linux-kernel - Re: [PATCH] kernel: make rcu/tree

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Message-ID: <20150826013601.GA6085@windriver.com>
Date:	Tue, 25 Aug 2015 21:36:01 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
CC:	Josh Triplett <josh@...htriplett.org>,
	<linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <jiangshanlai@...il.com>
Subject: Re: [PATCH] kernel: make rcu/tree_trace.c explicitly non-modular

[Re: [PATCH] kernel: make rcu/tree_trace.c explicitly non-modular] On 25/08/2015 (Tue 15:37) Paul E. McKenney wrote:

> On Tue, Aug 25, 2015 at 02:11:09PM -0400, Paul Gortmaker wrote:
> > [Re: [PATCH] kernel: make rcu/tree_trace.c explicitly non-modular] On 25/08/2015 (Tue 09:29) Josh Triplett wrote:
> > 
> > > On Tue, Aug 25, 2015 at 11:23:17AM -0400, Paul Gortmaker wrote:
> > > > The Kconfig currently controlling compilation of this code is:
> > > > 
> > > > init/Kconfig:config TREE_RCU_TRACE
> > > > init/Kconfig:   def_bool RCU_TRACE && ( TREE_RCU || PREEMPT_RCU )
> > > > 
> > > > ...meaning that it currently is not being built as a module by anyone.
> > > > 
> > > > Lets remove the modular code that is essentially orphaned, so that
> > > > when reading the file there is no doubt it is builtin-only.
> > > > 
> > > > Since module_init translates to device_initcall in the non-modular
> > > > case, the init ordering remains unchanged with this commit.  We could
> > > > consider moving this to an earlier initcall if desired.
> > > > 
> > > > We don't replace module.h with init.h since the file already has that.
> > > > We also delete the moduleparam.h include that is left over from
> > > > commit 64db4cfff99c04cd5f550357edcc8780f96b54a2 (""Tree RCU": scalable
> > > > classic RCU implementation") since it is not needed here either.
> > > > 
> > > > We leave some tags like MODULE_AUTHOR for documentation purposes.
> > > > 
> > > > Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> > > > Cc: Josh Triplett <josh@...htriplett.org>
> > > > Cc: Steven Rostedt <rostedt@...dmis.org>
> > > > Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
> > > > Cc: Lai Jiangshan <jiangshanlai@...il.com>
> > > > Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
> > > 
> > > Seems reasonable, though leaving the MODULE_* metadata commented out at
> > > the end seems odd.  I'd suggest using the DESCRIPTION to update the
> > 
> > That was largely driven by the desire to make as minimalist change as
> > possible...
> 
> This would be for v4.4, so getting rid of the three "MODULE_*" lines
> at the end makes sense, as does moving any needed info to the comment
> block at the beginning of the file.

OK, no problem.

> 
> > > comment at the top (which is actually outdated and needs
> > > s/classic/hierarchical/), dropping the MODULE_LICENSE (redundant with
> > > the license header), and changing "MODULE_AUTHOR" into an "Author:"
> > > under the copyright.
> > 
> > ...but I can also do it that way too; fine by me.  I'll wait a bit to
> > give Paul a chance to comment before resending, in case he also wants
> > some changes.
> 
> The "classic" is indeed obsolete, may as well change it while we are
> at it.  I was concerned about the THIS_MODULE instances, but this appears
> to be defined even for non-module builds, so should be OK.

Ah, ye of little faith.  I dealt with THIS_MODULE in f5016932, now over
four years ago (gasp!)

> 
> So please do send a patch with the changes Josh called out.

Will do.

Thanks,
Paul.
--

> 
> 							Thanx, Paul
> 
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