linux-kernel - Re: [v3.11][3.12][Regression] ACPI / processor: Use common hotplug infrastructure

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Date:	Sat, 16 Nov 2013 00:23:54 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Joseph Salisbury <joseph.salisbury@...onical.com>
Cc:	rafael.j.wysocki@...el.com, lenb@...nel.org,
	linux-acpi@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [v3.11][3.12][Regression]  ACPI / processor: Use common hotplug infrastructure

On Saturday, November 16, 2013 12:16:05 AM Rafael J. Wysocki wrote:
> On Saturday, November 16, 2013 12:00:50 AM Rafael J. Wysocki wrote:
> > On Friday, November 15, 2013 11:55:10 PM Rafael J. Wysocki wrote:
> > > On Friday, November 15, 2013 12:44:11 PM Joseph Salisbury wrote:
> > > > Hi Rafael,
> > > > 
> > > > A kernel bug affecting several users was opened against Ubuntu[0]. 
> > > > After a bisect, it was found the following commit introduced the regression:
> > > > 
> > > > commit ac212b6980d8d5eda705864fc5a8ecddc6d6eacc
> > > > Author: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > > > Date: Fri May 3 00:26:22 2013 +0200
> > > > 
> > > >     ACPI / processor: Use common hotplug infrastructure
> > > > 
> > > > The regression was introduced as of v3.11-rc1.
> > > > 
> > > > This commit doesn't revert cleanly in 3.12, and requires the revert of
> > > > other commits as well.  I wanted to get your feedback since you are the
> > > > author.
> > > 
> > > Well, that commit has nothing to do with PCMCIA, so I'm not sure how the
> > > breakage is related to it.
> > > 
> > > Moreover, comment #8 reports 3.11.0-11.17 as working and the change you're
> > > asking about should be in that kernel as well.
> > 
> > Ah, so that was bogus.
> > 
> > Well, I'm still not sure how the commit in question may affect PCMCIA.  I have
> > a test machine with PCMCIA and it boots correctly with 3.11+.
> 
> The bisect could just trip over a different bug in that commit that was fixed
> later.
> 
> Moreover, comment #70 indicates that 3.11.0-11-generic works correctly for
> someone.
> 
> I'm also unsure what comment #43 means.
> 
> And I wonder if the reported who "bisected" this can boot without PCMCIA?

One more thing.  Comment #32 says that the reporter could not reproduce the
problem without "the -extras package which contains the PCMCIA drivers."  So
I'm wondering why exactly the PCMCIA drivers are in that package?

Rafael

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