linux-kernel - Re: [PATCH] lib/scatterlist: Hook sg

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Message-ID: <1280352762.18075.3.camel@e102109-lin.cambridge.arm.com>
Date:	Wed, 28 Jul 2010 22:32:42 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	Jens Axboe <jaxboe@...ionio.com>
Subject: Re: [PATCH] lib/scatterlist: Hook sg_kmalloc into kmemleak (v2)

On Tue, 2010-07-27 at 09:44 +0100, Chris Wilson wrote:
> kmemleak ignores page_alloc() and so believes the final sub-page
> allocation using the plain kmalloc is decoupled and lost. This leads to
> lots of false-positives with code that uses scatterlists.
> 
> The options seem to be either to tell kmemleak that the kmalloc is not
> leaked or to notify kmemleak of the page allocations. The danger of the
> first approach is that we may hide a real leak, so choose the latter
> approach (of which I am not sure of the downsides).
> 
> v2: Added comments on the suggestion of Catalin.
> 
> Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>

Thanks. The patch looks good. I'll place it in my kmemleak branch and
send it to Linus together with other kmemleak patches (hopefully I won't
miss the merging window as I'm going on holiday for a week).

-- 
Catalin

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