linux-kernel - Re: 2.6.24-rc2-mm1

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Date:	Thu, 15 Nov 2007 14:56:04 -0800
From:	mark gross <mgross@...ux.intel.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Gabriel C <nix.or.die@...glemail.com>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.24-rc2-mm1

On Thu, Nov 15, 2007 at 11:19:50AM -0800, mark gross wrote:
> On Wed, Nov 14, 2007 at 12:40:08PM -0800, Andrew Morton wrote:
> > On Wed, 14 Nov 2007 12:29:59 -0800 mark gross <mgross@...ux.intel.com> wrote:
> > 
> > > > > [  102.366932]  =======================
> > > > > [  108.552031] printk: 31 messages suppressed.
> > > > 
> > > > 
> > > > All this BUG / WARNINGS are caused by *-qos* patches. Reverting this 3 patches makes the BUGs go away :
> > > > 
> > > > latencyc-use-qos-infrastructure.patch
> > > > pm-qos-infrastructure-and-interface.patch
> > > > pm-qos-infrastructure-and-interface-static-initialization-with-blocking-notifiers.patch
> > > > 
> > > > 
> > > > Gabriel
> > > > 
> > > > 
> > > This looks like the same issue Rafael saw.
> > > 
> > > Try the patch in the following post:
> > > 
> > > http://marc.info/?l=linux-kernel&m=119265627228498&w=2
> > > 
> > 
> > Well that's not very good.  _I_ can go fishing in my lkml archives for random
> > patches but not everyone is set up to do that.  And the diff to which you
> > refer gets 100% rejects against rc2-mm1 anyway.
> > 
> > Please prepare a tested, changelogged patch against rc2-mm1 asap.  
> 
> I'm having difficulty coming up with a .config that boots, I'll continue
> working on this but the following is what I'm pretty confident will fix
> the warnings.  
> 
> You should hold off until I get a system booting 2.6.24-rc2-mm1 before
> taking this.

I'm able to boot and have done a bit of testing and this patch wasn't
good enough.  I'm sending a new one in a min.

--mgross

> 
> pm-qos-remove-locks-around-blocking-notifier-registration.patch
> 
> Changelog: 
> Remove spin locking around blocking notifier calls that can sleep.
> 
> --mgross
> 
> Signed-off-by: mark gross <mgross@...ux.intel.com>
> 
> 
> 
> 
> Index: linux-2.6.24-rc2-mm1/kernel/pm_qos_params.c
> ===================================================================
> --- linux-2.6.24-rc2-mm1.orig/kernel/pm_qos_params.c	2007-11-15 11:09:27.000000000 -0800
> +++ linux-2.6.24-rc2-mm1/kernel/pm_qos_params.c	2007-11-15 11:10:08.000000000 -0800
> @@ -319,13 +319,10 @@
>   */
>   int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier)
>  {
> -	unsigned long flags;
>  	int retval;
>  
> -	spin_lock_irqsave(&pm_qos_lock, flags);
>  	retval = blocking_notifier_chain_register(
>  			pm_qos_array[pm_qos_class]->notifiers, notifier);
> -	spin_unlock_irqrestore(&pm_qos_lock, flags);
>  
>  	return retval;
>  }
> @@ -341,13 +338,10 @@
>   */
>  int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier)
>  {
> -	unsigned long flags;
>  	int retval;
>  
> -	spin_lock_irqsave(&pm_qos_lock, flags);
>  	retval = blocking_notifier_chain_unregister(
>  			pm_qos_array[pm_qos_class]->notifiers, notifier);
> -	spin_unlock_irqrestore(&pm_qos_lock, flags);
>  
>  	return retval;
>  }
> -
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