linux-kernel - Re: [PATCH 3/6] INIT: Limit the number of per cpu calibration bootup messages

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Message-ID: <4B01C803.1010303@sgi.com>
Date:	Mon, 16 Nov 2009 13:45:39 -0800
From:	Mike Travis <travis@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	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>,
	David Rientjes <rientjes@...gle.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 3/6] INIT: Limit the number of per cpu calibration bootup
 messages



Ingo Molnar wrote:
> * Mike Travis <travis@....com> wrote:
> 
>> --- linux.orig/init/calibrate.c
>> +++ linux/init/calibrate.c
>> @@ -123,23 +123,26 @@
>>  {
>>  	unsigned long ticks, loopbit;
>>  	int lps_precision = LPS_PREC;
>> +	bool boot_cpu = (smp_processor_id() == 0);
> 
> this code is shared by other architectures too - are you sure 
> smp_processor_id()==0 is a proper 'I am the boot CPU' assumption 
> everywhere?
> 
> 	Ingo

This was where having the boot_cpu_id would have been handy.

I could add something like:

--- linux.orig/init/main.c
+++ linux/init/main.c
@@ -539,13 +539,15 @@
  *     Activate the first processor.
  */

+int boot_cpu_id __read_mostly;
+
 static void __init boot_cpu_init(void)
 {
-       int cpu = smp_processor_id();
+       int boot_cpu_id = smp_processor_id();
        /* Mark the boot cpu "present", "online" etc for SMP and UP case */
-       set_cpu_online(cpu, true);
-       set_cpu_present(cpu, true);
-       set_cpu_possible(cpu, true);
+       set_cpu_online(boot_cpu_id, true);
+       set_cpu_present(boot_cpu_id, true);
+       set_cpu_possible(boot_cpu_id, true);
 }

 void __init __weak smp_setup_processor_id(void)

and remove boot_cpu_id from arch/x86 ... ?

Thanks,
Mike
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