linux-kernel - Re: [tip:core/debug] debug lockups: Improve lockup detection

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Message-Id: <20090802140809.7ec4bb6b.akpm@linux-foundation.org>
Date:	Sun, 2 Aug 2009 14:08:09 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	paulmck@...ux.vnet.ibm.com, mingo@...hat.com, hpa@...or.com,
	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	torvalds@...ux-foundation.org, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:core/debug] debug lockups: Improve lockup detection

On Sun, 2 Aug 2009 22:41:50 +0200 Ingo Molnar <mingo@...e.hu> wrote:

> 
> * Andrew Morton <akpm@...ux-foundation.org> wrote:
> 
> > On Sun, 2 Aug 2009 21:26:57 +0200 Ingo Molnar <mingo@...e.hu> wrote:
> > 
> > > > I think this just broke all non-x86 non-sparc SMP architectures.
> > > 
> > > Yeah - it 'broke' them in the sense of them not having a working 
> > > trigger_all_cpu_backtrace() implementation to begin with.
> > 
> > c'mon.  It broke them in the sense that sysrq-l went from "works" 
> > to "doesn't work".
> 
> You are right (i broke it with my patch) but the thing is, sysrq-l 
> almost useless currently: it uses schedule_work() which assumes a 
> mostly working system with full irqs and scheduling working fine. 
> Now, i dont need sysrq-l on mostly working systems.
> 
> So the 'breakage' is of something that was largely useless: and now 
> you put the onus of implementing it for _all_ architectures (which i 
> dont use) on me?

I never said that.

It's appropriate that those architectures be left with their existing
level of functionality/usefulness, as you're already discussing.

> > It's better to break the build or to emit warnings than to 
> > silently and secretly break their stuff.
> 
> But that warning will bounce the ball back to me, wont it? My patch 
> will be blamed for 'breaking' those architectures, right?

It's a very crude and somewhat rude way of communicating information to
other architecture maintainers.

A better way would be to send them an email explaining the problem and
outlining some solutions, no?
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