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

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Message-ID: <alpine.DEB.2.10.1501081044470.26196@pianoman.cluster.toy>
Date:	Thu, 8 Jan 2015 10:44:53 -0500 (EST)
From:	Vince Weaver <vince@...ter.net>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
cc:	Catalin Marinas <catalin.marinas@....com>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pavel Machek <pavel@....cz>,
	Marc Zyngier <marc.zyngier@....com>,
	kernel list <linux-kernel@...r.kernel.org>,
	vincent.weaver@...ne.edu
Subject: Re: [PATCH] Revert 9fc2105aeaaf56b0cf75296a84702d0f9e64437b to fix
 pyaudio (and probably more)

On Thu, 8 Jan 2015, Russell King - ARM Linux wrote:

> It's not a regression - yet.  No one has shown that userspace has broken
> according to the definition of the first quote above, and that's the
> whole point.

How much does one have to regress before it is a problem?  I have two 
projects I've worked on that "broke" due to this issue.  

They were minor breakages though.

The "linux_logo" userspace sysinfo tool broke to the extent that it 
was parsing for the bogomips string in /proc/cpuinfo and printed poorly 
formatted and/or corrupted text info to screen when it couldn't find it.

The "PAPI" library had some really ancient (and poorly 
thought-out) fallback code that would try to estimate MHz from bogomips 
if a MHz value was not available via the traditional methods.  This
failed after the change too, but not many people use PAPI on ARM so it 
wasn't that big an issue.

I noticed these problems early, even before the change hit mainline.
But when I complained I was told in no uncertain terms that the ARM
maintainers were tired of hearing about bogomips issues and nothing
could be done to stop the change from getting in.

Vince
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