linux-kernel - Re: [Ksummit-2010-discuss] [v2] Remaining BKL users, what to do

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Date:	Fri, 5 Nov 2010 03:27:06 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Pekka Enberg <penberg@...nel.org>,
	ksummit-2010-discuss@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Ingo Molnar <mingo@...e.hu>
Cc:	Pavel Machek <pavel@....cz>, Greg KH <greg@...ah.com>,
	Oliver Neukum <oliver@...kum.org>, Valdis.Kletnieks@...edu,
	Dave Airlie <airlied@...il.com>,
	dri-devel@...ts.freedesktop.org
Subject: Re: [Ksummit-2010-discuss] [v2] Remaining BKL users, what to do

On Wednesday 03 November 2010, Pekka Enberg wrote:
> On Tue, Nov 2, 2010 at 3:21 AM, Pavel Machek <pavel@....cz> wrote:
> > Hi!
> >
> >> @@ -79,6 +79,10 @@ static struct drm_driver driver = {
> >>
> >>  static int __init i810_init(void)
> >>  {
> >> +     if (num_present_cpus() > 1) {
> >> +             pr_err("drm/i810 does not support SMP\n");
> >> +             return -EINVAL;
> >> +     }
> >>       driver.num_ioctls = i810_max_ioctl;
> >>       return drm_init(&driver);
> >
> > Umm, and now someone onlines second cpu?
> 
> Well, I see it's being fixed in a different way but yeah,
> num_possible_cpus() would be more appropriate here.

(trimming Cc list again)

I thought that patch was still current, what other way are we fixing it now?

Since I'm planning to do one more series for 2.6.37 to take care of the
remaining BKL users, should I push the patch above plus the one that
marks the module as "depends on !PREEMPT || BROKEN", or should that go through
the DRM tree?

Pavel: The only board that has this chipset with multiple sockets is for
Pentium III and does not have hotplug sockets, so num_present_cpus 
is the same as num_possible_cpus here. I can change it to num_possible_cpus
of course.

	Arnd
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