From: Christoph Lameter <cl@linux.com>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: Jungseok Lee <jungseoklee85@gmail.com>,
mark.rutland@arm.com, takahiro.akashi@linaro.org,
barami97@gmail.com, will.deacon@arm.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
james.morse@arm.com, tj@kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v6 2/3] percpu: add PERCPU_ATOM_SIZE for a generic percpu area setup
Date: Mon, 2 Nov 2015 10:48:17 -0600 (CST) [thread overview]
Message-ID: <alpine.DEB.2.20.1511021047420.28255@east.gentwo.org> (raw)
In-Reply-To: <20151102162236.GB7637@e104818-lin.cambridge.arm.com>
On Mon, 2 Nov 2015, Catalin Marinas wrote:
> I haven't looked at the patch 3/3 in detail but I'm pretty sure I'll NAK
> the approach (and the definition of PERCPU_ATOM_SIZE), therefore
> rendering this patch unnecessary. IIUC, this is used to enforce some
> alignment of the per-CPU IRQ stack to be able to check whether the
> current stack is process or IRQ on exception entry. But there are other,
> less intrusive ways to achieve the same (e.g. x86).
The percpu allocator allows the specification of alignment requirements.
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next prev parent reply other threads:[~2015-11-02 16:48 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-01 7:46 [PATCH v6 0/3] Introduce IRQ stack on arm64 with percpu changes Jungseok Lee
2015-11-01 7:46 ` [PATCH v6 1/3] percpu: remove PERCPU_ENOUGH_ROOM which is stale definition Jungseok Lee
2015-11-02 16:08 ` Christoph Lameter
2015-11-02 19:10 ` Tejun Heo
2015-11-03 14:12 ` Jungseok Lee
2015-11-03 22:07 ` Tejun Heo
2015-11-04 13:19 ` Jungseok Lee
2015-11-01 7:46 ` [PATCH v6 2/3] percpu: add PERCPU_ATOM_SIZE for a generic percpu area setup Jungseok Lee
2015-11-02 16:10 ` Christoph Lameter
2015-11-02 16:22 ` Catalin Marinas
2015-11-02 16:48 ` Christoph Lameter [this message]
2015-11-02 17:35 ` Catalin Marinas
2015-11-02 18:11 ` Christoph Lameter
2015-11-02 18:31 ` Catalin Marinas
2015-11-03 13:49 ` Jungseok Lee
2015-11-03 17:58 ` James Morse
2015-11-04 13:35 ` Jungseok Lee
2015-11-03 14:11 ` Jungseok Lee
2015-11-01 7:46 ` [PATCH v6 3/3] arm64: Introduce IRQ stack Jungseok Lee
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