linux-kernel - Re: [RFC][PATCH 4/5] printk: Have wake_up_klogd() use __this_cpu

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Message-ID: <alpine.DEB.2.00.1109200952460.8056@router.home>
Date:	Tue, 20 Sep 2011 09:54:10 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	Steven Rostedt <rostedt@...dmis.org>
cc:	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>,
	Christoph Lameter <cl@...ux.com>
Subject: Re: [RFC][PATCH 4/5] printk: Have wake_up_klogd() use
 __this_cpu_write()

On Mon, 19 Sep 2011, Steven Rostedt wrote:

> Note, just because something is always in a location that preemption is
> disabled, does not mean it should use the __this_cpu*() variants.

Why not? If preemption is disabled then the process cannot be migrated to
another processor. And thus doing the address calculations and operations
on variables step by step is okay.

> Because if things change, it may become a problem later on.

What things may change? Someone calls the function with preemption
enabled?
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