linux-kernel - Re: [RFC PATCH 2/3] kmemleak: Add callbacks to the bootmem allocator

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Message-ID: <20090708114626.GA6151@cmpxchg.org>
Date:	Wed, 8 Jul 2009 13:46:26 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: [RFC PATCH 2/3] kmemleak: Add callbacks to the bootmem allocator

On Wed, Jul 08, 2009 at 10:43:51AM +0100, Catalin Marinas wrote:

> kmemleak: Add callbacks to the bootmem allocator
> 
> From: Catalin Marinas <catalin.marinas@....com>
> 
> This patch adds kmemleak_alloc/free callbacks to the bootmem allocator.
> This would allow scanning of such blocks and help avoiding a whole class
> of false positives and more kmemleak annotations.
> 
> Signed-off-by: Catalin Marinas <catalin.marinas@....com>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Pekka Enberg <penberg@...helsinki.fi>

Reviewed-by: Johannes Weiner <hannes@...xchg.org>

> ---
>  mm/bootmem.c |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/mm/bootmem.c b/mm/bootmem.c
> index d2a9ce9..90f3ed0 100644
> --- a/mm/bootmem.c
> +++ b/mm/bootmem.c
> @@ -335,6 +335,8 @@ void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
>  {
>  	unsigned long start, end;
>  
> +	kmemleak_free_part(__va(physaddr), size);
> +
>  	start = PFN_UP(physaddr);
>  	end = PFN_DOWN(physaddr + size);
>  
> @@ -354,6 +356,8 @@ void __init free_bootmem(unsigned long addr, unsigned long size)
>  {
>  	unsigned long start, end;
>  
> +	kmemleak_free_part(__va(addr), size);
> +
>  	start = PFN_UP(addr);
>  	end = PFN_DOWN(addr + size);
>  
> @@ -516,6 +520,7 @@ find_block:
>  		region = phys_to_virt(PFN_PHYS(bdata->node_min_pfn) +
>  				start_off);
>  		memset(region, 0, size);
> +		kmemleak_alloc(region, size, 1, 0);
>  		return region;
>  	}
--
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