linux-kernel - RE: lockdep oddity

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Message-ID: <004901c6d18d$acc45620$0200a8c0@nuitysystems.com>
Date:	Wed, 6 Sep 2006 01:23:02 -0700
From:	"Hua Zhong" <hzhong@...il.com>
To:	"'Heiko Carstens'" <heiko.carstens@...ibm.com>,
	"'Andrew Morton'" <akpm@...l.org>
Cc:	"'Ingo Molnar'" <mingo@...e.hu>, <linux-kernel@...r.kernel.org>,
	"'Arjan van de Ven'" <arjan@...radead.org>,
	"'Daniel Walker'" <dwalker@...sta.com>
Subject: RE: lockdep oddity

We are just trading accuracy for speed here.

> On Wed, Sep 06, 2006 at 12:47:24AM -0700, Andrew Morton wrote:
> > On Wed, 6 Sep 2006 09:20:43 +0200
> > Heiko Carstens <heiko.carstens@...ibm.com> wrote:
> > 
> > > I'm also wondering why the profile
> > > patch contains this:
> > > 
> > > +       if (ret)
> > > +               likeliness->count[1]++;
> > > +       else
> > > +               likeliness->count[0]++;
> > > 
> > > This isn't smp safe. Is that on purpose or a bug?
> > 
> > Purposeful.   This is called from all contexts, including NMI.
> 
> Why not use atomic_inc then? Or is there some architecture 
> dependent limitation that it can't be done in every context?

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