From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ralf Baechle <ralf@linux-mips.org>
Subject: Re: [PATCH V2 12/12] MIPS: Loongson: Make CPUFreq usable for
 Loongson-3
Date: Tue, 11 Nov 2014 12:07:02 +0100
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To: Huacai Chen <chenhc@lemote.com>
Cc: John Crispin <john@phrozen.org>, "Steven J. Hill" <Steven.Hill@imgtec.com>, Linux MIPS Mailing List <linux-mips@linux-mips.org>, linux-pm@vger.kernel.org, Fuxin Zhang <zhangfx@lemote.com>, Zhangjin Wu <wuzhangjin@gmail.com>, Hongliang Tao <taohl@lemote.com>
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On Tue, Nov 11, 2014 at 07:02:48PM +0800, Huacai Chen wrote:

> Loops_per_jiffy is set on startup and doesn't change later. It reflect
> the maximum value frequency, but for CPU hotplug, a new online CPU may
> not run at the maximum frequency (remain the old value before it is
> offline).

As suspected.  But what if a CPU is hotunplugged, then the clockrate
for all the CPUs changes and then the gets re-hotplugged into the system.
Wouldn't in that case the udelay_val be used?

  Ralf