linux-kernel - Re: [RFC][PATCH 0/5] Introduce checks for preemptable code for this_cpu

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Message-ID: <alpine.DEB.2.00.1109201109470.8056@router.home>
Date:	Tue, 20 Sep 2011 11:10:50 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	Steven Rostedt <rostedt@...dmis.org>
cc:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [RFC][PATCH 0/5] Introduce checks for preemptable code for
 this_cpu_read/write()

On Tue, 20 Sep 2011, Steven Rostedt wrote:

> I really mean all other users of this_cpu_*(), including the cmpxchg and
> friends, still need to have preemption disabled.

This is argument against the basic design of this_cpu_ops. They were
designed to avoid having to disable preemption for single operations on
per cpu data. I think this shows a basic misunderstanding of what you are
dealing with.


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