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

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Message-ID: <84144f020811290348x61cb502bn75e20c9024b889cc@mail.gmail.com>
Date:	Sat, 29 Nov 2008 13:48:25 +0200
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Catalin Marinas" <catalin.marinas@....com>
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 Catalin,


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.
>
> Signed-off-by: Catalin Marinas <catalin.marinas@....com>
> Cc: Ingo Molnar <mingo@...e.hu>
> ---
>  drivers/char/vt.c      |    7 +++++++
>  include/linux/percpu.h |    5 +++++
>  2 files changed, 12 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/char/vt.c b/drivers/char/vt.c
> index a5af607..bb024f8 100644
> --- a/drivers/char/vt.c
> +++ b/drivers/char/vt.c
> @@ -104,6 +104,7 @@
>  #include <linux/io.h>
>  #include <asm/system.h>
>  #include <linux/uaccess.h>
> +#include <linux/memleak.h>
>
>  #define MAX_NR_CON_DRIVER 16
>
> @@ -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.

>                INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
>                visual_init(vc, currcons, 1);
>                vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
--
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