linux-kernel - Re: mmotm 2009-02-02-17-12 uploaded (x86/nopmd etc.)

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Message-Id: <20090203134128.37042ea8.akpm@linux-foundation.org>
Date:	Tue, 3 Feb 2009 13:41:28 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	jeremy@...p.org, jaswinderrajput@...il.com,
	randy.dunlap@...cle.com, linux-kernel@...r.kernel.org,
	x86@...nel.org, righi.andrea@...il.com
Subject: Re: mmotm 2009-02-02-17-12 uploaded (x86/nopmd etc.)

On Tue, 3 Feb 2009 22:25:38 +0100
Ingo Molnar <mingo@...e.hu> wrote:

> 
> * Andrew Morton <akpm@...ux-foundation.org> wrote:
> 
> > On Tue, 3 Feb 2009 20:18:04 +0100
> > Ingo Molnar <mingo@...e.hu> wrote:
> > 
> > > 
> > > * Randy Dunlap <randy.dunlap@...cle.com> wrote:
> > > 
> > > > akpm@...ux-foundation.org wrote:
> > > > > The mm-of-the-moment snapshot 2009-02-02-17-12 has been uploaded to
> > > > > 
> > > > >    http://userweb.kernel.org/~akpm/mmotm/
> > > > > 
> > > > > and will soon be available at
> > > > > 
> > > > >    git://git.zen-sources.org/zen/mmotm.git
> > > > 
> > > > 
> > > > There seems to be some kind of #include hell here.  I moved a few lines
> > > > around in include/asm-generic/pgtable-nopmd.h & that makes the build
> > > > get further, but it still has header problems (BUG() is undefined).
> > > 
> > > problem caused by which commit?
> > > 
> > 
> > mm-unify-some-pmd_-functions-and-move-them-in-a-distinct-include.patch
> > 
> > This is getting painful.
> 
> the include file spaghetti is ... interesting there, and it's historic.
> 
> I could blame it on highmem, PAE or paravirt - but i'll only blame it on 
> paravirt for now because those developers are still around! ;-)
> 
> Jeremy, any ideas how to reduce the historic dependency mess in that area?
> I think we should go on three routes at once:
> 
>  - agressive splitup and separation of type definitions from method
>    declaration (+ inline definitions). The spinlock_types.h / spinlock.h 
>    splitup was really nice in solving such dependency problems.

I like this one.  The mixing up of declare-something with use-something
is often the source of our woes.


>  - uninlining of methods: instead of macro-ing them - wherever possible. 
>    It's really hard to mess up type + externs headers - while headers with 
>    inlines and macros mixed in get painful quickly.
> 
>  - removal of spurious pile of dozens of #include lines in header files.
> 
> If anyone sends such patches i could try them on the -tip build machinery 
> and help shake out collateral damage - which there will be for sure.
> 
> 	Ingo
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