linux-kernel - Re: [PATCH v6 2/3] percpu: add PERCPU_ATOM

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Date:	Mon, 2 Nov 2015 10:48:17 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Catalin Marinas <catalin.marinas@....com>
cc:	Jungseok Lee <jungseoklee85@...il.com>, mark.rutland@....com,
	takahiro.akashi@...aro.org, barami97@...il.com,
	will.deacon@....com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, james.morse@....com, tj@...nel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v6 2/3] percpu: add PERCPU_ATOM_SIZE for a generic percpu
 area setup

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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