linux-kernel - Re: [PATCH 0/4] sh: fix up modular use in non-modular code

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Date:	Thu, 26 May 2016 12:53:34 -0400
From:	Rich Felker <dalias@...c.org>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>
Subject: Re: [PATCH 0/4] sh: fix up modular use in non-modular code

On Thu, May 26, 2016 at 12:45:57PM -0400, Paul Gortmaker wrote:
> [[PATCH 0/4] sh: fix up modular use in non-modular code] On 22/04/2016 (Fri 14:07) Paul Gortmaker wrote:
> 
> > For anyone new to the underlying goal of this cleanup, we are trying to
> > make kernel code consistent with the Makefiles/Kconfigs that control them.
> 
> Ping -- wondering if there are any issues here, or if I can expect these
> to be merged upstream in the merge window.  I didn't see them loop
> around via the linux-next tree but I wasn't sure if arch/sh has a repo
> for linux-next.

I don't have experience with the affected code, but it looks ok unless
any of these "should" be modular and Kconfig was just wrong to
disallow it.

Sato-san, do you have an opinion on these? Should I go ahead and just
merge them?

Rich

> > This means not using modular functions/macros for code that can never
> > be built as a module.  Some of the other downfalls this leads to are:
> > 
> >  (1) it is easy to accidentally write unused module_exit and remove code
> >  (2) it can be misleading when reading the source, thinking it can be
> >      modular when the Makefile and/or Kconfig prohibit it
> >  (3) it requires the include of the module.h header file which in turn
> >      includes nearly everything else, thus adding to CPP overhead.
> >  (4) it gets copied/replicated into other drivers and spreads like weeds.
> > 
> > Three of the four commits here are completely trivial with zero runtime
> > impact whatsoever.  The fourth has a deletion of a ".remove" function
> > and as we've done elsewhere, we block the sysfs ability to reach in and
> > manually execute that function, since there isn't a sane use case for
> > which doing that makes sense.
> > 
> > Build tested on today's linux-next ; full build fails on duplicate syms
> > from OF generic board, but that is a known and reported issue elsewhere;
> > it has nothing to do with the changes here.
> > 
> > Paul
> > --
> > 
> > Cc: linux-sh@...r.kernel.org
> > Cc: Paul Gortmaker <paul.gortmaker@...driver.com>
> > Cc: Rich Felker <dalias@...c.org>
> > Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
> > 
> > 
> > Paul Gortmaker (4):
> >   sh: make time.c explicitly non-modular
> >   sh: make mm/asids-debugfs explicitly non-modular
> >   sh: make board-secureedge5410 explicitly non-modular
> >   sh: make heartbeat driver explicitly non-modular
> > 
> >  arch/sh/boards/board-secureedge5410.c |  3 +--
> >  arch/sh/drivers/heartbeat.c           | 32 +++-----------------------------
> >  arch/sh/kernel/time.c                 |  3 +--
> >  arch/sh/mm/asids-debugfs.c            |  5 +----
> >  4 files changed, 6 insertions(+), 37 deletions(-)
> > 
> > -- 
> > 2.8.0
> > 
> --
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