linux-kernel - Re: Regression on cpufreq in v3.12-rc1

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Message-ID: <CACRpkdYxiDA25Yb+csWWgXMmJuKMMTNVbdF+2JUnsSrXQpYysQ@mail.gmail.com>
Date:	Thu, 19 Sep 2013 14:55:10 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: Regression on cpufreq in v3.12-rc1

On Thu, Sep 19, 2013 at 2:46 PM, Srivatsa S. Bhat
<srivatsa.bhat@...ux.vnet.ibm.com> wrote:

>>> I don't really know if this is the right solution at all, so please
>>> help me out here... if you want that patch I can send it once
>>> I understand this properly.
>
> IIRC, recent kernels didn't return 0 or any error code when the !policy
> condition was matched. So can you check whether this problem occurs with
> 3.11 or 3.10 as well?

v3.11 works fine.

The problem is not what it returns, the system seems to survive no matter
whether it returns 0 or 17 or whatever.

The problem is that sometimes in the v3.12 kernel cycle we got a
BUG() crash instead of some random value back for calling early.

> So I think we should first identify (bisect?) and understand what caused that
> particular change and then we will be in a position to evaluate whether the
> patch you proposed would be the right fix or not.

I'll see if I can get a bisect going, the problem is that I upload the
kernel over the serial port so this isn't a very quick procedure :-(

Yours,
Linus Walleij
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