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

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Date:	Mon, 23 Dec 2013 16:20:34 +0800
From:	Xie XiuQi <xiexiuqi@...wei.com>
To:	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...e.de>,
	Ingo Molnar <mingo@...e.hu>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Li Bin <huawei.libin@...wei.com>
Subject: Re: [PATCH][TRIVIAL] x86/smpboot: fix cpu bootup message

Sorry, this patch has a typo, please ignore it. I'll send a
new version soon.

On 2013/12/23 15:14, Xie XiuQi wrote:
> When CPU0 and CPU1 aren't in same package, we got message
> like this:
> 
> [    0.995698] x86: Booting SMP configuration:
> [    0.999858] .... node  #0, CPUs:        #1  #2  #3  #4  #5  #6  #7  #8
> [    1.201584] .... node  #1, CPUs:    #9 #10 #11 #12 #13 #14 #15 #16
> [    1.402525] .... node  #2, CPUs:   #17 #18 #19 #20 #21 #22 #23 #24
> [    1.603620] .... node  #3, CPUs:   #25 #26 #27 #28 #29 #30 #31 #32
> [    1.804226] .... node  #4, CPUs:   #33 #34 #35 #36 #37 #38 #39
> [    1.914040] .... node  #5, CPUs:   #40 #41 #42 #43 #44 #45 #46 #47
> [    2.115568] .... node  #6, CPUs:   #48 #49 #50 #51 #52 #53 #54 #55
> [    2.316541] .... node  #7, CPUs:   #56 #57 #58 #59 #60 #61 #62 #63
> [    2.517030] x86: Booted up 8 nodes, 64 CPUs
> 
> My box's configuration as below:
> xiexiuqi@...alhost:~> lscpu
> [...]
> NUMA node0 CPU(s):     1-8
> NUMA node1 CPU(s):     9-16
> NUMA node2 CPU(s):     17-24
> NUMA node3 CPU(s):     25-32
> NUMA node4 CPU(s):     0,33-39
> NUMA node5 CPU(s):     40-47
> NUMA node6 CPU(s):     48-55
> NUMA node7 CPU(s):     56-63
> 
> With this patch, we'll get message like this:
> 
> [    0.995698] x86: Booting SMP configuration:
> [    0.999858] .... node  #0, CPUs:    #1  #2  #3  #4  #5  #6  #7  #8
> [    1.201584] .... node  #1, CPUs:    #9 #10 #11 #12 #13 #14 #15 #16
> [    1.402525] .... node  #2, CPUs:   #17 #18 #19 #20 #21 #22 #23 #24
> [    1.603620] .... node  #3, CPUs:   #25 #26 #27 #28 #29 #30 #31 #32
> [    1.804226] .... node  #4, CPUs:       #33 #34 #35 #36 #37 #38 #39
> [    1.914040] .... node  #5, CPUs:   #40 #41 #42 #43 #44 #45 #46 #47
> [    2.115568] .... node  #6, CPUs:   #48 #49 #50 #51 #52 #53 #54 #55
> [    2.316541] .... node  #7, CPUs:   #56 #57 #58 #59 #60 #61 #62 #63
> [    2.517030] x86: Booted up 8 nodes, 64 CPUs
> 
> Signed-off-by: Xie XiuQi <xiexiuqi@...wei.com>
> ---
>  arch/x86/kernel/smpboot.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
> index 85dc05a..d434d3a 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)) {
> +				pr_cont("%*s", width + 1, " ");
> +				boot_padding = 1;
> +			}
> +		}
> 
>  		pr_cont("%*s#%d", width - num_digits(cpu), " ", cpu);
> 


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