linux-kernel - Re: [PATCH 2/7] ACPI: Limit the number of per cpu ACPI bootup messages

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Date:	Thu, 12 Nov 2009 13:28:36 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Mike Travis <travis@....com>
cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Roland Dreier <rdreier@...co.com>,
	Randy Dunlap <rdunlap@...otime.net>, Tejun Heo <tj@...nel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Jack Steiner <steiner@....com>,
	Frederic Weisbecker <fweisbec@...il.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/7] ACPI: Limit the number of per cpu ACPI bootup
 messages

On Thu, 12 Nov 2009, Mike Travis wrote:

> > > --- linux.orig/drivers/acpi/tables.c
> > > +++ linux/drivers/acpi/tables.c
> > > @@ -66,11 +66,15 @@
> > >  		{
> > >  			struct acpi_madt_local_x2apic *p =
> > >  			    (struct acpi_madt_local_x2apic *)header;
> > > -			printk(KERN_INFO PREFIX
> > > -			       "X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
> > > -			       p->local_apic_id, p->uid,
> > > -			       (p->lapic_flags & ACPI_MADT_ENABLED) ?
> > > -			       "enabled" : "disabled");
> > > +			/*
> > > +			 * Per cpu tracing clogs console output when NR_CPUS
> > > +			 * is large.  Send only to kernel log buffer.
> > > +			 */
> > > +			printk(KERN_DEBUG PREFIX
> > > +				"X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
> > > +				p->local_apic_id, p->uid,
> > > +				(p->lapic_flags & ACPI_MADT_ENABLED) ?
> > > +					"enabled" : "disabled");
> > >  		}
> > >  		break;
> > >  
> > 
> > You can still use dev_dbg(PREFIX "...") here.
> 
> I thought dev_dbg needed the 'dev' structure and I wasn't sure how to get
> that...?
> 

Ah, ok, it needs to be pr_debug(PREFIX "...") then.

Any reason why the other printk's in acpi_table_print_madt_entry() weren't 
converted to use KERN_DEBUG?  It might make more sense to convert all 
those to use a new acpi=verbose flag.

I'm not sure if Ingo is the right person to go through for acpi patches, I 
think this should probably be submitted to Len Brown <lenb@...nel.org> and 
linux-acpi@...r.kernel.org instead.
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