linux-kernel - Re: [PATCH 3/3] ring-buffer: add design document

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Message-Id: <1244776417.5320.160.camel@yhuang-dev.sh.intel.com>
Date:	Fri, 12 Jun 2009 11:13:37 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Theodore Tso <tytso@....edu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	"Martin J. Bligh" <mbligh@...igh.org>,
	Christoph Hellwig <hch@...radead.org>,
	Li Zefan <lizf@...fujitsu.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: Re: [PATCH 3/3] ring-buffer: add design document

On Thu, 2009-06-11 at 10:38 +0800, Mathieu Desnoyers wrote:
> > > Are these archs without cmpxchg and NMIs, a concern for you?
> > 
> > ARM has no cmpxchg until ARM v6, but it has NMI like mechanism named
> > FIQ.
> > 
> 
> One could probably adapt the cmpxchg for earlier ARM so it disables
> FIQs. Note that the current limitation is that there is only a
> fiq disable, not a fiq save/restore.

Yes. It seems that ARM is OK after FIQ save/restore issue is fixed.
Another machine with NMI but no NMI-safe cmpxchg is "real" 386. That is
very old machine, does that matter?

Best Regards,
Huang Ying


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