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

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Date:	Fri, 2 Jul 2010 15:33:52 -0400
From:	Chris Metcalf <cmetcalf@...era.com>
To:	Matthew Wilcox <matthew@....cx>
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 7/2/2010 3:19 PM, Matthew Wilcox wrote:
> On Fri, Jul 02, 2010 at 01:41:14PM -0400, Chris Metcalf wrote:
>   
>> This allows a list_head (or hlist_head, etc.) to be used from places
>> that used to be impractical, in particular <asm/processor.h>, which
>> used to cause include file recursion: <linux/list.h> includes
>> <linux/prefetch.h>, which always includes <asm/processor.h> for the
>> prefetch macros, as well as <asm/system.h>, which often includes
>> <asm/processor.h> directly or indirectly.
>>     
> 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).

-- 
Chris Metcalf, Tilera Corp.
http://www.tilera.com

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