linux-kernel - Re: [BUG cpufreq] Invalid argument on writing to scaling

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Message-ID: <3664850.5ao49mLJsS@vostro.rjw.lan>
Date:	Fri, 01 Aug 2014 14:47:53 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Prarit Bhargava <prarit@...hat.com>
Cc:	Fengguang Wu <fengguang.wu@...el.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Aaron Lu <aaron.lu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [BUG cpufreq] Invalid argument on writing to scaling_governor

On Friday, August 01, 2014 06:46:51 AM Prarit Bhargava wrote:
> 
> On 08/01/2014 06:43 AM, Fengguang Wu wrote:
> > Hi Prarit,
> > 
> > I noticed that commit dbcbfe6aa0d61ae5e13cab43b30802482007c199 ("cpufreq: hold
> > policy->rwsem for duration of changing governors") will cause this problem:
> > 
> > root@...4 ~# echo performance > /sys/devices/system/cpu/cpu3/cpufreq/scaling_governor
> > -bash: echo: write error: Invalid argument
> > 
> > root@...4 ~# cat /sys/devices/system/cpu/cpu3/cpufreq/scaling_available_governors
> > conservative userspace powersave ondemand performance
> > 
> 
> Rafael, this patch needs to be rejected based on my previous comments, most
> notably Saravana was able to reproduce the original problem.  I'm going to wait
> for his reproducer and see what I can do.

I've dropped it already.  At least as far as I can say it shouldn't be there in
my linux-next branch any more.  Can you double check, please?

Rafael

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