linux-kernel - Re: [gcv v3 06/35] scheduler: Replace __get_cpu

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Message-ID: <00000140e4373c9e-ea44cb7f-985f-4d33-86ed-cfd54ec7327b-000000@email.amazonses.com>
Date:	Tue, 3 Sep 2013 14:26:01 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Steven Rostedt <rostedt@...dmis.org>
cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Tejun Heo <tj@...nel.org>, akpm@...uxfoundation.org,
	Ingo Molnar <mingo@...hat.com>, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [gcv v3 06/35] scheduler: Replace __get_cpu_var uses

On Thu, 29 Aug 2013, Steven Rostedt wrote:

> How many places use the this_cpu_*() without preemption disabled? I
> wouldn't think there's many. I never complained about another variant,
> so you need to ask those that have. The tough question for me is what
> that variant name should be ;-)

Tried to add preemption checks but the basic issue is that many of the
checks themselves use this_cpu_ops. percpu.h is very basic to the
operation of fundamental primitives for preempt etc. Use of a BUG_ON needs
a seris of includes in percpu.h that cause more trouble.

If I switch __this_cpu ops to check for preemption then the logic for
preemption etc must use the raw_this_cpu ops.
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