linux-kernel - Re: [PATCH 11/14] kmemleak: Remove some of the kmemleak false positives

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Date:	Fri, 19 Dec 2008 22:15:11 +0200
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Catalin Marinas" <catalin.marinas@....com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/14] kmemleak: Remove some of the kmemleak false positives

On Fri, Dec 19, 2008 at 8:13 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>

> @@ -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.
> +                */
> +               kmemleak_alloc(vc, sizeof(struct vc_data), 1, GFP_ATOMIC);
>                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);

I think there was some discussion about adding hooks to the bootmem
allocator. Didn't that work out?
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