linux-kernel - Re: [PATCH] ring_buffer: map to cpu not page

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Date:	Thu, 2 Oct 2008 19:36:57 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Jonathan Corbet <corbet@....net>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	prasad@...ux.vnet.ibm.com, "Frank Ch. Eigler" <fche@...hat.com>,
	David Wilder <dwilder@...ibm.com>, hch@....de,
	Martin Bligh <mbligh@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Steven Rostedt <srostedt@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [PATCH] ring_buffer: map to cpu not page


On Thu, 2 Oct 2008, Steven Rostedt wrote:

> 
> My original patch had a compile bug when NUMA was configured. I
> referenced cpu when it should have been cpu_buffer->cpu.
> 
> Ingo quickly fixed this bug by replacing cpu with 'i' because that
> was the loop counter. Unfortunately, the 'i' was the counter of
> pages, not CPUs. This caused a crash when the number of pages allocated
> for the buffers exceeded the number of pages, which would usually

That should have been:

 "when the number of pages allocated for the buffers exceeded the number
  of cpus".

> be the case.
> 

-- Steve

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