linux-kernel - Re: [PATCH] Break out types from <linux/list.h> to <linux/list

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Date:	Fri, 2 Jul 2010 14:48:17 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Chris Metcalf <cmetcalf@...era.com>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] Break out types from <linux/list.h> to
	<linux/list_types.h>.

On Fri, Jul 02, 2010 at 03:33:52PM -0400, Chris Metcalf wrote:
> On 7/2/2010 3:19 PM, Matthew Wilcox wrote:
> > Why a new header file instead of linux/types.h?
> 
> I was working from analogy to kvm_types.h, mm_types.h, rwlock_types.h,
> spinlock_types.h.  My impression is that linux/types.h is generally for
> basic (non-struct) types, with atomic_t/atomic64_t being added as
> "almost non-struct types", and of course the historical exception of
> "struct ustat", which has been there since the dawn of time (0.97 anyway).

I think list_head, hlist_head and hlist_node qualify as "almost non-struct
types", don't you?  :-)

I wouldn't mind seeing kvm_types.h, rwlock_types.h and spinlock_types.h
merged into types.h, personally.  They're all pretty fundamental kernel
kind of types.  It's a matter of taste, and I'm not particularly fussed
one way or the other.

mm_types.h is complex and full of mm-specific information, so keeping
it separate makes sense to me.

I just object to the unnecessary creation of tiny files like this.
Which is how we ended up with atomic_t and atomic64_t in there in the
first place :-)

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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