linux-kernel - Re: [PATCH] Add kmemleak annotations to lmb.c

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Message-Id: <1250130193.4850.15.camel@concordia>
Date:	Thu, 13 Aug 2009 12:23:13 +1000
From:	Michael Ellerman <michael@...erman.id.au>
To:	linuxppc-dev@...abs.org
Cc:	catalin.marinas@....com, "David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Add kmemleak annotations to lmb.c

On Mon, 2009-08-10 at 15:05 +1000, Michael Ellerman wrote:
> We don't actually want kmemleak to track the lmb allocations, so we
> pass min_count as 0. However telling kmemleak about lmb allocations
> allows it to scan that memory for pointers to other memory that is
> tracked by kmemleak, ie. slab allocations etc.
> 
> Signed-off-by: Michael Ellerman <michael@...erman.id.au>
> ---
>  lib/lmb.c |    6 +++++-
>  1 files changed, 5 insertions(+), 1 deletions(-)
> 
> diff --git a/lib/lmb.c b/lib/lmb.c
> index e4a6482..dc10bc5 100644
> --- a/lib/lmb.c
> +++ b/lib/lmb.c
> @@ -352,8 +352,10 @@ u64 __init lmb_alloc_nid(u64 size, u64 align, int nid,
>  		u64 ret = lmb_alloc_nid_region(&mem->region[i],
>  					       nid_range,
>  					       size, align, nid);
> -		if (ret != ~(u64)0)
> +		if (ret != ~(u64)0) {
> +			kmemleak_alloc(__va(ret), size, 0, 0);
>  			return ret;
> +		}
>  	}
>  
>  	return lmb_alloc(size, align);
> @@ -412,6 +414,8 @@ u64 __init __lmb_alloc_base(u64 size, u64 align, u64 max_addr)
>  				/* this area isn't reserved, take it */
>  				if (lmb_add_region(&lmb.reserved, base, size) < 0)
>  					return 0;
> +
> +				kmemleak_alloc(__va(base), size, 0, 0);
>  				return base;
>  			}
>  			res_base = lmb.reserved.region[j].base;

This needs an include of kmemleak.h for some configs, new patch coming.

cheers

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