linux-kernel - Re: dealing with excessive includes

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Message-ID: <20061019162308.GT29920@ftp.linux.org.uk>
Date:	Thu, 19 Oct 2006 17:23:08 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	Linus Torvalds <torvalds@...l.org>
Cc:	Alexey Dobriyan <adobriyan@...il.com>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: dealing with excessive includes

On Wed, Oct 18, 2006 at 09:32:08AM -0700, Linus Torvalds wrote:
> That said, I'd rather do any lock_super() cleanup totally _independently_ 
> of a include file cleanup. 
> 
> So since it's clearly not performance-critical, how about just making it 
> be out-of-line in fs/super.c, and turn the header file into just a 
> declaration?

Next fun question on strategy: we have a very good bunch of candidates on
killable includes in skbuff.h - highmem.h, mm.h and poll.h.  I've done
preliminary variants on amd64 and they give nice reductions of deps
counts with small patches.  The tricky part is a couple of helpers -
k{un,}map_skb_frag().  They require highmem.h; nothing else in skbuff.h
does.  Only two places are using them - net/core/skbuff.c and
net/appletalk/ddp.c (the latter in one function - dealing with Apple's
take on checksums[1]).

Possible variants:
	* turn into macros.  Works for a test run, not nice for final
variant.
	* new header just for those two in include/net
	* new header in net/core, with ddp.c including ../core/skb_kmap.h
	* inline in net/core/skbuff.h, extern in ddp.c; then normal paths
get it inlined and appletalk can live with uninlined version.

Preferences?

[1] appletalk: the proof that Vogon neuroanatomy was not entirely fictional.
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