linux-kernel - Re: [PATCH -v3] x86: do not free zero sized per cpu areas

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Date:	Fri, 19 Mar 2010 16:43:29 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ian Campbell <Ian.Campbell@...rix.com>
CC:	Yinghai Lu <yinghai@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH -v3] x86: do not free zero sized per cpu areas

On 03/19/2010 04:35 PM, Ian Campbell wrote:
> 
> I think Peter means:
> 
> if (start == end)
> return;
> 
> if (WARN_ONCE(start < end, "blah"))
> return;

start > end!

> i.e. silently ignore a zero sized region and verbosely ignore a
> negatively sized one.

Correct.

	-hpa
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