From: Christoph Lameter <cl@linux.com>
To: Tejun Heo <tj@kernel.org>
Cc: Dmitry Antipov <dmitry.antipov@linaro.org>,
Rusty Russell <rusty@rustcorp.com.au>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
patches@linaro.org, linaro-dev@lists.linaro.org
Subject: Re: [PATCH 1/3] percpu: use ZERO_SIZE_PTR / ZERO_OR_NULL_PTR
Date: Mon, 30 Jan 2012 11:22:14 -0600 (CST) [thread overview]
Message-ID: <alpine.DEB.2.00.1201301121330.28693@router.home> (raw)
In-Reply-To: <20120130171558.GB3355@google.com>
On Mon, 30 Jan 2012, Tejun Heo wrote:
> Percpu pointers are in a different address space and using
> ZERO_SIZE_PTR directly will trigger sparse address space warning.
> Also, I'm not entirely sure whether 16 is guaranteed to be unused in
> percpu address space (maybe it is but I don't think we have anything
> enforcing that).
We are already checking for NULL on free. So there is a presumption that
these numbers are unused.
next prev parent reply other threads:[~2012-01-30 17:22 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-30 8:37 [PATCH 1/3] percpu: use ZERO_SIZE_PTR / ZERO_OR_NULL_PTR Dmitry Antipov
2012-01-30 16:15 ` Christoph Lameter
2012-01-30 17:15 ` Tejun Heo
2012-01-30 17:19 ` Tejun Heo
2012-01-30 17:22 ` Christoph Lameter
2012-01-30 17:33 ` Tejun Heo
2012-01-30 17:35 ` Christoph Lameter
2012-01-30 17:22 ` Christoph Lameter [this message]
2012-01-30 17:42 ` Tejun Heo
2012-01-30 17:52 ` Christoph Lameter
2012-01-30 17:54 ` Tejun Heo
2012-01-30 17:58 ` Christoph Lameter
2012-01-30 18:02 ` Tejun Heo
2012-01-30 18:12 ` Christoph Lameter
2012-01-30 18:16 ` Tejun Heo
2012-01-31 4:48 ` Rusty Russell
2012-01-30 18:13 ` Tejun Heo
2012-01-30 18:15 ` Christoph Lameter
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