linux-kernel - RE: [patch 14/18] x86, ds: use single debug store cpu configuration

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Date:	Fri, 3 Apr 2009 07:46:30 +0100
From:	"Metzger, Markus T" <markus.t.metzger@...el.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	"tglx@...utronix.de" <tglx@...utronix.de>,
	"hpa@...or.com" <hpa@...or.com>,
	"markus.t.metzger@...il.com" <markus.t.metzger@...il.com>,
	"roland@...hat.com" <roland@...hat.com>,
	"eranian@...glemail.com" <eranian@...glemail.com>,
	"oleg@...hat.com" <oleg@...hat.com>,
	"Villacis, Juan" <juan.villacis@...el.com>,
	"ak@...ux.jf.intel.com" <ak@...ux.jf.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [patch 14/18] x86, ds: use single debug store cpu configuration

>-----Original Message-----
>From: Ingo Molnar [mailto:mingo@...e.hu]
>Sent: Thursday, April 02, 2009 9:30 PM
>To: Metzger, Markus T
>Cc: tglx@...utronix.de; hpa@...or.com; markus.t.metzger@...il.com; roland@...hat.com;
>eranian@...glemail.com; oleg@...hat.com; Villacis, Juan; ak@...ux.jf.intel.com; linux-
>kernel@...r.kernel.org
>Subject: Re: [patch 14/18] x86, ds: use single debug store cpu configuration
>
>
>* markus.t.metzger@...el.com <markus.t.metzger@...el.com> wrote:
>
>> Use a single configuration for all cpus.
>>
>
>> @@ -1291,11 +1290,15 @@ ds_configure(const struct ds_configurati
>>  	printk("bts/pebs record: %u/%u bytes\n",
>>  	       ds_cfg.sizeof_rec[ds_bts], ds_cfg.sizeof_rec[ds_pebs]);
>>
>> -	WARN_ON_ONCE(MAX_SIZEOF_DS < (12 * ds_cfg.sizeof_ptr_field));
>> +	WARN_ON(MAX_SIZEOF_DS < (12 * ds_cfg.sizeof_ptr_field));
>
>Why this change?

The function is only called once, now - for the boot cpu.
The _ONCE is a nop. I thought its better to remove it, since it became redundant.

regards,
markus.

>
>Firstly, it was not declared in the changelog which is a no-no.
>
>Secondly, this is a bad change: we are more than content to have a
>single such warning bootup - not dozens of it (on some large
>system).
>
>	Ingo
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