linux-kernel - Re: [kerneloops] regression in 2.6.27 wrt "lock

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Message-ID: <20081012194641.GH10429@nb.net.home>
Date:	Sun, 12 Oct 2008 21:46:42 +0200
From:	Karel Zak <kzak@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	Nick Piggin <nickpiggin@...oo.com.au>
Subject: Re: [kerneloops] regression in 2.6.27 wrt "lock_page" and the
	"hwclock" program

On Sun, Oct 05, 2008 at 10:27:42AM -0700, Andrew Morton wrote:
> On Sun, 5 Oct 2008 08:11:45 -0700 Arjan van de Ven <arjan@...radead.org> wrote:
> > 
> > static unsigned long   
> > atomic(const char *name, unsigned long (*op)(unsigned long),
> >        unsigned long arg)
> > {
> >   unsigned long v;
> >   __asm__ volatile ("cli");
> >   v = (*op)(arg);
> >   __asm__ volatile ("sti");
> >   return v;
> > } 
> > 
> > looks like it (but only on 32 bit x86, not on 64 bit x86)
> 
> I suspect this is new in hwclock?

 since util-linux-2.9v, year 1999

> > (and yes someone really ought to fix hwclock; it's rather broken)
> 
> well yeah. Recently broken?

 9 years ago

    Karel

-- 
 Karel Zak  <kzak@...hat.com>
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