linux-kernel - Re: [PATCH] nommu: fix kobjsize() for SLOB and SLUB, v2.

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Message-ID: <19f34abd0806101118r5edbc065t8a19b69abf9aea5c@mail.gmail.com>
Date:	Tue, 10 Jun 2008 20:18:20 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"Christoph Lameter" <clameter@....com>
Cc:	"Paul Mundt" <lethal@...ux-sh.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Pekka Enberg" <penberg@...helsinki.fi>,
	"David Howells" <dhowells@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, cooloney@...nel.org,
	mpm@...enic.com
Subject: Re: [PATCH] nommu: fix kobjsize() for SLOB and SLUB, v2.

On 6/10/08, Christoph Lameter <clameter@....com> wrote:
> On Mon, 2 Jun 2008, Paul Mundt wrote:
>
>  > +     page = virt_to_head_page(objp);
>  > +     if (!page)
>  > +             return 0;
>
>
> virt_to_head_page cannot return NULL. virt_to_page also does not return
>  NULL. pfn_valid() needs to be used to figure out if a page is valid.
>  Otherwise the page struct reference that was returned may have
>  PageReserved() set to indicate that it is not a valid page.
>

Are you sure it shouldn't be virt_addr_valid()? If yes, can you please
explain the difference? Thanks :-)


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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