linux-kernel - Re: [PATCH 11/15] kmemleak: Remove some of the kmemleak false positives

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Date:	Sun, 30 Nov 2008 19:02:36 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH 11/15] kmemleak: Remove some of the kmemleak false
	positives

Hi Pekka,

On Sat, 2008-11-29 at 13:48 +0200, Pekka Enberg wrote:
> On Sat, Nov 29, 2008 at 12:44 PM, Catalin Marinas
> <catalin.marinas@....com> wrote:
> > There are allocations for which the main pointer cannot be found but
> > they are not memory leaks. This patch fixes some of them. For more
> > information on false positives, see Documentation/kmemleak.txt.
[...]
> > --- a/drivers/char/vt.c
> > +++ b/drivers/char/vt.c
[...]
> > @@ -2882,6 +2883,12 @@ static int __init con_init(void)
> >         */
> >        for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
> >                vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
> > +               /*
> > +                * Kmemleak does not track the memory allocated via
> > +                * alloc_bootmem() but this block contains pointers to
> > +                * other blocks allocated via kmalloc.
> > +                */
> > +               memleak_alloc(vc, sizeof(struct vc_data), 1);
> 
> Can we add some hooks to alloc_bootmem() to handle this? It's somewhat
> unfortunate that we need to annotate driver code.

I did a quick grep for the alloc_bootmem uses in the kernel and I don't
think these would increase the chance of getting false negatives. I'll
give it a try.

Thanks.

-- 
Catalin

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