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

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Date:	Mon, 23 Dec 2013 15:14:10 +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: [PATCH][TRIVIAL] x86/smpboot: fix cpu bootup message

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);

-- 
1.8.2.2


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