linux-kernel - Re: [PATCH v2][TRIVIAL] x86/smpboot: fix cpu bootup message

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Date:	Tue, 24 Dec 2013 09:09:02 +0800
From:	Xie XiuQi <xiexiuqi@...wei.com>
To:	Borislav Petkov <bp@...e.de>
CC:	Ingo Molnar <mingo@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Li Bin <huawei.libin@...wei.com>
Subject: Re: [PATCH v2][TRIVIAL] x86/smpboot: fix cpu bootup message

On 2013/12/23 21:34, Borislav Petkov wrote:
> On Mon, Dec 23, 2013 at 04:33:00PM +0800, Xie XiuQi wrote:
>> When CPU0 and CPU1 aren't in same package, we got message
>> like this:
>>

[...]

>>
>> diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
>> index 85dc05a..9e82c1e 100644
>> --- a/arch/x86/kernel/smpboot.c
>> +++ b/arch/x86/kernel/smpboot.c
>> @@ -639,7 +639,7 @@ static void announce_cpu(int cpu, int apicid)
>>  {
>>  	static int current_node = -1;
>>  	int node = early_cpu_to_node(cpu);
>> -	static int width, node_width;
>> +	static int width, node_width, padding;
>>
>>  	if (!width)
>>  		width = num_digits(num_possible_cpus()) + 1; /* + '#' sign */
>> @@ -658,11 +658,13 @@ static void announce_cpu(int cpu, int apicid)
>>
>>  			printk(KERN_INFO ".... node %*s#%d, CPUs:  ",
>>  			       node_width - num_digits(node), " ", node);
>> -		}
>>
>> -		/* Add padding for the BSP */
>> -		if (cpu == 1)
>> -			pr_cont("%*s", width + 1, " ");
>> +			/* Add padding for the BSP */
>> +			if (!padding && (early_cpu_to_node(0) == current_node)) {
> 
> You don't need "padding".
> 

On another machine, the configuration is:

xiexiuqi@...alhost:~> lscpu
[...]
NUMA node0 CPU(s):     4-7,12-15
NUMA node1 CPU(s):     0-3,8-11

Without "padding", we'll get message like this:

[    0.349339] x86: Booting SMP configuration:
[    0.353504] .... node  #1, CPUs:        #1  #2  #3
[    0.398812] .... node  #0, CPUs:    #4  #5  #6  #7
[    0.535186] .... node  #1, CPUs:        #8  #9 #10 #11
[    0.594312] .... node  #0, CPUs:   #12 #13 #14 #15
[    0.652398] x86: Booted up 2 nodes, 16 CPUs

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