linux-kernel - Re: Question about memory leak detector giving false positive report for net/core/flow.c

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Message-ID: <20110929190741.GA10425@mtj.dyndns.org>
Date:	Thu, 29 Sep 2011 12:07:41 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Christoph Lameter <cl@...two.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Huajun Li <huajun.li.lee@...il.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	netdev <netdev@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Question about memory leak detector giving false positive report
 for net/core/flow.c

On Thu, Sep 29, 2011 at 03:18:10PM +0100, Catalin Marinas wrote:
> On Thu, Sep 29, 2011 at 03:08:47PM +0100, Christoph Lameter wrote:
> > On Wed, 28 Sep 2011, Catalin Marinas wrote:
> > 
> > > I tried this but it's tricky. The problem is that the percpu pointer
> > > returned by alloc_percpu() does not directly point to the per-cpu chunks
> > > and kmemleak would report most percpu allocations as leaks. So far the
> > > workaround is to simply mark the alloc_percpu() objects as never leaking
> > > and at least we avoid false positives in other areas. See the patch
> > > below (note that you have to increase the CONFIG_KMEMLEAK_EARLY_LOG_SIZE
> > > as there are many alloc_percpu() calls before kmemleak is fully
> > > initialised):
> > 
> > Seems that kernel.org is out and so tejon wont be seeing these.
> 
> That's ok, I don't aim this at the upcoming merging window. I don't have
> an alternative email address for him.

That's htejun@...il.com but as long as lkml is cc'd I can read the
emails.  Lack of replies is more due to the month long vacation which
just ended. ;)

Thank you.

-- 
tejun
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