linux-kernel - Re: [PATCH 1/2] kmemcheck v3

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Date:	Fri, 8 Feb 2008 13:15:50 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Vegard Nossum <vegard.nossum@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Richard Knutsson <ricknu-0@...dent.ltu.se>,
	Christoph Lameter <clameter@....com>
Subject: Re: [PATCH 1/2] kmemcheck v3

On Fri, Feb 08, 2008 at 01:37:11PM +0200, Pekka Enberg wrote:
> Hi Andi,
> 
> On Feb 8, 2008 1:55 PM, Andi Kleen <andi@...stfloor.org> wrote:
> > Also i'm not sure how you handle initializedness of DMAed data
> > (like network buffers). Wouldn't you need hooks into pci_dma_*
> > for this?
> 
> If the DMA'd memory is allocated from the page allocator, we don't

RX Network packets are usually allocated with kmalloc

Undoubtedly there are others too, e.g. USB comes to mind.

> need to worry about it just yet. In case it's from kmalloc() you can
> pass __GFP_NOTRACK to annotate those call sites where the memory is

Ok you should add that then to skbuff.c. 

-Andi
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