linux-kernel - Re: [RFC] remove implicit slab.h inclusion from percpu.h

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Message-ID: <4B9F36C7.4020304@kernel.org>
Date:	Tue, 16 Mar 2010 16:44:07 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	penberg@...helsinki.fi, adobriyan@...il.com
Subject: Re: [RFC] remove implicit slab.h inclusion from percpu.h

Hello,

On 03/16/2010 03:54 PM, Tejun Heo wrote:
> Maybe a better way is to grab for slab API usages in .c files which
> don't have slab.h inclusion.  If breaking the dependency is the way to
> go, I can definitely write up some scripts and do test builds on some
> archs.  There sure will be some fallouts but I think it won't be too
> bad.

Hmmm... here are some interesting numbers.  Not completely exact but
should give the general ballpark idea.

all .c files					: 13999
.c files which use any of slab interface	:  5603
.c files which include slab.h			:  2519
.c files which include slab.h but don't use it	:   577
.c files which use slab but don't include it	:  3661

.c files with k[mzc]alloc/k[z]free usage	:  5291
.c files with other slab interface usage	:   356

C files which use k[mzc]alloc/k[z]free covers ~38% of all c files.
One possibility is to separate out those into kmalloc.h and make it
available universally via kernel.h.

Thanks.

-- 
tejun
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