linux-kernel - Re: [PATCH 3/3] percpu: add macro PCPU_CHUNK_AREA_IN

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Date:	Mon, 20 Jul 2015 10:35:02 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Baoquan He <bhe@...hat.com>
cc:	tj@...nel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] percpu: add macro PCPU_CHUNK_AREA_IN_USE

On Mon, 20 Jul 2015, Baoquan He wrote:

> chunk->map[] contains <offset|in-use flag> of each area. Now add a
> new macro PCPU_CHUNK_AREA_IN_USE and use it as the in-use flag to
> replace all magic number '1'.

Hmmm... This is a bitflag and the code now looks like there is some sort
of bitmask that were are using. Use bitops or something else that clearly
implies that a bit is flipped instead?
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