linux-kernel - Re: Don't apply 9f022e54b8ea82d1ecdf3bd78d9ab9f44d6b0655 to stable please.

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Message-ID: <20120403130428.GA12464@phenom.dumpdata.com>
Date:	Tue, 3 Apr 2012 09:04:28 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, stable@...r.kernel.org
Subject: Re: Don't apply 9f022e54b8ea82d1ecdf3bd78d9ab9f44d6b0655 to stable
 please.

On Mon, Apr 02, 2012 at 04:49:04PM -0700, Greg KH wrote:
> On Mon, Apr 02, 2012 at 04:43:05PM -0700, Suresh Siddha wrote:
> > On Mon, 2012-04-02 at 16:27 -0700, Greg KH wrote:
> > > On Mon, Apr 02, 2012 at 06:47:02PM -0400, Konrad Rzeszutek Wilk wrote:
> > > > Hey Greg,
> > > > 
> > > > The git commit 9f022e54b8ea82d1ecdf3bd78d9ab9f44d6b0655 has CC stable@...nel.org
> > > > but it breaks Xen - we are working to fix it in 3.4, but the fix for it
> > > > does some architectual changes (136d249ef7dbf0fefa292082cc40be1ea864cbd6) that
> > > > I don't know if you are comfortable putting in stable tree.
> > > > 
> > > 
> > > I have no idea what that git commit id referrs to, as it's not in
> > > Linus's tree at the moment.
> > > 
> > > Care to give me a subject?  diffstat?  Some kind of hint?
> > 
> > Greg, Konrad is referring to:
> > 
> > commit 73d63d038ee9f769f5e5b46792d227fe20e442c5
> 
> Ok, then where did the 9f022e54b8ea82d1ecdf3bd78d9ab9f44d6b0655 number
> come from?  And where was I supposed to be able to determine what it is
> pointing to?

Hm, somehow that is the git commit I saw, but it probably was b/c it got
cherrypicked in my testing tree.
> 
> Come on people...
> 
> > Author: Suresh Siddha <suresh.b.siddha@...el.com>
> > Date:   Mon Mar 12 11:36:33 2012 -0700
> > 
> >     x86/ioapic: Add register level checks to detect bogus io-apic entries
> > 
> > With out this commit, if the bios lists bogus io-apic's, then we will
> > see some error messages ("Unable to reset IRR for apic")during linux
> > boot which are benign. But as this patch breaks Xen, I am ok if these
> > don't get applied to 'stable'. Also I think it is Ingo who added the
> > 'stable' tag. Ingo, are you ok with this?
> 
> What stable trees did this already go into in the releases today?

None. That is why I am sending this advance warning so you don't
put it in.

> 
> You need to tell me what I need to revert here, SPECIFICALLY, and in
> what tree, if needed, otherwise I have no idea what is going on, sorry,
> I can't read minds.
> 
> > For the mainline, we have queued more patches to fix the Xen breakage.
> 
> And what is that supposed to mean to me?
> 
> Again, help me out here, this is making no sense at all.
> 
> How am I supposed to "not apply" a patch that I have never heard of?
> And how am I supposed to "not apply" a patch that I have already
> applied?
> 
> How about you all start over from the beginning and tell me EXACTLY what
> you want me to do here, because I sure as heck don't know what is going
> on...

Heh.

The patch titled "x86/ioapic: Add register level checks to detect bogus io-apic entries"
(git commit 73d63d038ee9f769f5e5b46792d227fe20e442c5) that is in v3.4-rc1, even
thought it has cc: stable@...nel.org, should _NOT_ be applied to the stable tree.

> 
> confused,
> 
> greg k-h
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