linux-kernel - Re: [PATCH] nommu: fix kobjsize() for SLOB and SLUB

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Message-ID: <20080522235032.GA22697@linux-sh.org>
Date:	Fri, 23 May 2008 08:50:32 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Pekka J Enberg <penberg@...helsinki.fi>, dhowells@...hat.com,
	mpm@...enic.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nommu: fix kobjsize() for SLOB and SLUB

On Thu, May 22, 2008 at 04:45:55PM -0700, Christoph Lameter wrote:
> On Fri, 23 May 2008, Paul Mundt wrote:
> > Is ksize() happy with taking the head page instead of virt_to_page(objp)?
> 
> ksize() takes a pointer to an object. ksize() cannot take a the pointer to 
> a page struct.
> 
Ah, so it does. In that case, we still need to kill off the page->index
BUG_ON() bits, while PageCompound() will take care of the compound order
bits that the page->index shifting seems to have been trying to
implement, the BUG_ON() will still trigger for PAGE_SIZE page cache
pages.
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