linux-kernel - Re: [discuss] Re: 2.6.19-rc5: known regressions (v3)

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Message-ID: <Pine.LNX.4.64.0611151105560.3349@woody.osdl.org>
Date:	Wed, 15 Nov 2006 11:07:59 -0800 (PST)
From:	Linus Torvalds <torvalds@...l.org>
To:	Andi Kleen <ak@...e.de>
cc:	Andrew Morton <akpm@...l.org>, discuss@...-64.org,
	William Cohen <wcohen@...hat.com>,
	Eric Dumazet <dada1@...mosbay.com>,
	Komuro <komurojun-mbn@...ty.com>,
	Ernst Herzberg <earny@...4u.de>,
	Andre Noll <maan@...temlinux.org>,
	oprofile-list@...ts.sourceforge.net,
	Jens Axboe <jens.axboe@...cle.com>,
	linux-usb-devel@...ts.sourceforge.net, phil.el@...adoo.fr,
	Adrian Bunk <bunk@...sta.de>, Ingo Molnar <mingo@...hat.com>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-pci@...ey.karlin.mff.cuni.cz,
	Stephen Hemminger <shemminger@...l.org>,
	Prakash Punnoor <prakash@...noor.de>,
	Len Brown <len.brown@...el.com>,
	Alex Romosan <romosan@...orax.lbl.gov>, gregkh@...e.de,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrey Borzenkov <arvidjaar@...l.ru>
Subject: Re: [discuss] Re: 2.6.19-rc5: known regressions (v3)



On Wed, 15 Nov 2006, Andi Kleen wrote:
> > 
> > Meanwhile we should restore the NMI counter to fix this bug.
> 
> No, it was always oprofile who was buggy here, silently taking 
> the nmi watchdog away.

Andi, your "blame game" doesn't matter.

The fact is, it used to work, and the kernel changed interfaces, so now it 
doesn't. 

In other words, a kernel interface to user land changed. THAT IS ALWAYS A 
BUG. We don't change UI.

Yes, "oprofile" should be fixed to not depend on that, but the kernel 
shouldn't change the interfaces, and we should add back the zero entry.

		Linus
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