x86/smpboot: Fix announce_cpu() to printk() the last "OK" properly

When booting secondary CPUs, announce_cpu() is called to show which cpu has
been brought up. For example:

[    0.402751] smpboot: Booting Node   0, Processors  rabeeh#1 rabeeh#2 rabeeh#3 rabeeh#4 rabeeh#5 OK
[    0.525667] smpboot: Booting Node   1, Processors  rabeeh#6 linux4kix#7 linux4kix#8 linux4kix#9 linux4kix#10 linux4kix#11 OK
[    0.755592] smpboot: Booting Node   0, Processors  linux4kix#12 linux4kix#13 linux4kix#14 linux4kix#15 linux4kix#16 linux4kix#17 OK
[    0.890495] smpboot: Booting Node   1, Processors  linux4kix#18 linux4kix#19 linux4kix#20 linux4kix#21 linux4kix#22 linux4kix#23

But the last "OK" is lost, because 'nr_cpu_ids-1' represents the maximum
possible cpu id. It should use the maximum present cpu id in case not all
CPUs booted up.

Signed-off-by: Libin <[email protected]>
Cc: <[email protected]>
Cc: <[email protected]>
Cc: <[email protected]>
Cc: <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
[ tweaked the changelog, removed unnecessary line break, tweaked the format to align the fields vertically. ]
Signed-off-by: Ingo Molnar <[email protected]>

Author: libin2015

arch/x86/kernel/smpboot.c

@@ -653,6 +653,7 @@ static void announce_cpu(int cpu, int apicid)
 {
 	static int current_node = -1;
 	int node = early_cpu_to_node(cpu);
+	int max_cpu_present = find_last_bit(cpumask_bits(cpu_present_mask), NR_CPUS);
 
 	if (system_state == SYSTEM_BOOTING) {
 		if (node != current_node) {
@@ -661,7 +662,7 @@ static void announce_cpu(int cpu, int apicid)
 			current_node = node;
 			pr_info("Booting Node %3d, Processors ", node);
 		}
-		pr_cont(" #%d%s", cpu, cpu == (nr_cpu_ids - 1) ? " OK\n" : "");
+		pr_cont(" #%4d%s", cpu, cpu == max_cpu_present ? " OK\n" : "");
 		return;
 	} else
 		pr_info("Booting Node %d Processor %d APIC 0x%x\n",