linux-kernel - Re: [PATCH] Revert 9fc2105aeaaf56b0cf75296a84702d0f9e64437b to fix pyaudio (and probably more)

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Message-ID: <20150108224614.GA5034@amd>
Date:	Thu, 8 Jan 2015 23:46:14 +0100
From:	Pavel Machek <pavel@....cz>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Vince Weaver <vince@...ter.net>,
	"nicolas.pitre@...aro.org" <nicolas.pitre@...aro.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	kernel list <linux-kernel@...r.kernel.org>,
	"vincent.weaver@...ne.edu" <vincent.weaver@...ne.edu>
Subject: Re: [PATCH] Revert 9fc2105aeaaf56b0cf75296a84702d0f9e64437b to fix
 pyaudio (and probably more)

On Thu 2015-01-08 16:57:05, Russell King - ARM Linux wrote:
> On Thu, Jan 08, 2015 at 04:41:12PM +0000, Catalin Marinas wrote:
> > On Thu, Jan 08, 2015 at 04:34:50PM +0000, Russell King - ARM Linux wrote:
> > > On Thu, Jan 08, 2015 at 04:19:08PM +0000, Catalin Marinas wrote:
> > > > I really think we should stop this thread. User ABI breakage fixed now.
> > > 
> > > No.  Vince's email shows a more serious problem.
> > > 
> > > The ABI breakage issue was reported before the patches were apparently
> > > merged, but that information seems to have been lost.  We need to
> > > understand how that happened so similar instances don't happen in the
> > > future.
> > 
> > FYI, searching for "Vince Weaver" and "bogomips" found this:
> > 
> > https://lkml.org/lkml/2013/7/11/454
> 
> Gah.
> 
> It looks like the report was made by hanging it into a totally different
> thread to the patches which caused the problem, and which went nowhere
> near the ARM kernel mailing lists.

This went at least to Will Deacon and Nicolas Pitre.

https://lkml.org/lkml/2013/5/15/217

So AFAICT yes, we knowingly broke at least
com.securiteinfo.android.bogomips application.

> At least that explains why people like me who really need to know this
> stuff were not aware of the issue.
> 
> One thing I still can't get my head around though is... Vince reported
> the breakage on 11 July 2013, but the patch is dated 30 August and I
> merged it 2 September.  So, how did Vince know about it to report the
> ABI breakage?  Had it been sitting somewhere else?

There was discussion on lkml at May 2013, clearly marked "ARM:". I
don't see enough headers to know what else was copied.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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