linux-kernel - Re: [EDAC ABI v13 04/25] events/hw_event: Create a Hardware Events Report Mecanism (HERM)

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Date:	Thu, 10 May 2012 17:27:51 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Linux Edac Mailing List <linux-edac@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Doug Thompson <norsk5@...oo.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Tony Luck <tony.luck@...el.com>,
	gregkh <gregkh@...uxfoundation.org>
Subject: Re: [EDAC ABI v13 04/25] events/hw_event: Create a Hardware Events
 Report Mecanism (HERM)

On Thu, May 10, 2012 at 11:20:10AM -0400, Steven Rostedt wrote:
> On Thu, 2012-05-10 at 17:12 +0200, Borislav Petkov wrote:
> > On Thu, May 10, 2012 at 12:08:32PM -0300, Mauro Carvalho Chehab wrote:
> > > There's also another technical reason to give an acronym to the EDAC
> > > version that actually works: changeset numbers are not consistent
> > > within distributions (or other trees, like -stable - although this 60+
> > > patch series probably won't fit on -stable merging criteria).
> > >
> > > Also, this EDAC changeset 60+ patch series can't be represented by a
> > > single changeset, and requires userspace changes in order to get a
> > > proper representation model for memories.
> 
> Is this a redesign of EDAC or just a fix of it? Does this require
> userspace to use a new ABI?
> 
> > >
> > > Tagging the EDAC core version with a name helps a lot when dealing
> > > with all the unsolved bugzillas that will be closed by backporting
> > > this patch series in order to fix the serious EDAC core bug that
> > > were providing fake information to the end user for all Intel memory
> > > controllers manufactured after 2005.
> > 
> > edac_module.c:18:#define EDAC_VERSION "Ver: 2.1.0"
> > 
> > Increment that in the last patch.
> 
> If this is redesigning a subsystem and changing the ABI for userspace
> than a new name is appropriate. Much like ipchains turning into
> iptables.

But that's not the question. The subsystem is still called EDAC but
there's one patch which adds a tracepoint called trace_mc_error and this
is called needlessly a name - Hardware Events Report Mechanism - which
is only misleading and generating confusion even to its author.

Anyway, I think we solved the issue - we're going to increment
EDAC_VERSION and all is fine :-)

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
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