smpboot: CPU numbers printed as warning

[Paul Menzel]

Dear Linux folks,

Using Linux 5.10.13 (and before), looking at the Linux kernel warnings, 
the CPU numbers show up. For example with 12 cpus/threads:

```
$ sudo dmesg --level=warn
[    0.216103]   #2
[    0.220105]   #3
[    0.224103]   #4
[    0.228104]   #5
[    0.232110]   #6
[    0.236101]   #7
[    0.240102]   #8
[    0.244102]   #9
[    0.248100]  #10
[    0.252098]  #11
```

If I am not mistaken, this is from `announce_cpu()` in 
`arch/x86/kernel/smpboot.c`, and the `pr_cont()` in their “forgets” the 
log level it belongs to, maybe because of SMP and other messages are 
printed in between.

```
        if (system_state < SYSTEM_RUNNING) {
                if (node != current_node) {
                        if (current_node > (-1))
                                pr_cont("\n");
                        current_node = node;

                        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, " ");

                pr_cont("%*s#%d", width - num_digits(cpu), " ", cpu);

        } else
                pr_info("Booting Node %d Processor %d APIC 0x%x\n",
                        node, cpu, apicid);
```

Would using `pr_info()` instead be an acceptable fix?


Kind regards,

Paul