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

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Date:	Wed, 8 Jul 2009 11:46:44 +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 Tue, Jul 07, 2009 at 11:09:46PM +0100, Catalin Marinas wrote:

> It seems that alloc_bootmem_core() is central to all the bootmem
> allocations. Is it OK to place the kmemleak_alloc hook only in this
> function?
> 
> diff --git a/mm/bootmem.c b/mm/bootmem.c
> index 5a649a0..74cbb34 100644
> --- a/mm/bootmem.c
> +++ b/mm/bootmem.c
> @@ -520,6 +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;
>  	}

Yes, that should work.

> > > > +	kmemleak_alloc(ptr, size, 1, GFP_KERNEL);
> > 
> > These GFP_KERNEL startled me.  We know for sure that this code runs in
> > earlylog mode only and gfp is unused, right?  Can you perhaps just
> > pass 0 for gfp instead?
> 
> Yes, indeed.

Thank you.

	Hannes
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