x86/boot: Further compress CPUs bootup message

Turn it into (for example):

[    0.073380] x86: Booting SMP configuration:
[    0.074005] .... node   #0, CPUs:          #1   #2   #3   #4   #5   #6   #7
[    0.603005] .... node   #1, CPUs:     #8   #9  #10  #11  #12  #13  #14  #15
[    1.200005] .... node   #2, CPUs:    #16  #17  #18  #19  #20  #21  #22  #23
[    1.796005] .... node   #3, CPUs:    #24  #25  #26  #27  #28  #29  #30  #31
[    2.393005] .... node   #4, CPUs:    #32  #33  #34  #35  #36  #37  #38  #39
[    2.996005] .... node   #5, CPUs:    #40  #41  #42  #43  #44  #45  #46  #47
[    3.600005] .... node   #6, CPUs:    #48  #49  #50  #51  #52  #53  #54  #55
[    4.202005] .... node   #7, CPUs:    #56  #57  #58  #59  #60  #61  #62  #63
[    4.811005] .... node   #8, CPUs:    #64  #65  #66  #67  #68  #69  #70  #71
[    5.421006] .... node   #9, CPUs:    #72  #73  #74  #75  #76  #77  #78  #79
[    6.032005] .... node  #10, CPUs:    #80  #81  #82  #83  #84  #85  #86  #87
[    6.648006] .... node  #11, CPUs:    #88  #89  #90  #91  #92  #93  #94  #95
[    7.262005] .... node  #12, CPUs:    #96  #97  #98  #99 #100 #101 #102 #103
[    7.865005] .... node  #13, CPUs:   #104 #105 #106 #107 #108 #109 #110 #111
[    8.466005] .... node  #14, CPUs:   #112 #113 #114 #115 #116 #117 #118 #119
[    9.073006] .... node  #15, CPUs:   #120 #121 #122 #123 #124 #125 #126 #127
[    9.679901] x86: Booted up 16 nodes, 128 CPUs

and drop useless elements.

Change num_digits() to hpa's division-avoiding, cell-phone-typed
version which he went at great lengths and pains to submit on a
Saturday evening.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: huawei.libin@huawei.com
Cc: wangyijing@huawei.com
Cc: fenghua.yu@intel.com
Cc: guohanjun@huawei.com
Cc: paul.gortmaker@windriver.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20130930095624.GB16383@pd.tnic
Signed-off-by: Ingo Molnar <mingo@kernel.org>

3 files changed, 40 insertions, 11 deletions

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index d41f3ba26ced..2a165580fa16 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -647,22 +647,38 @@ wakeup_secondary_cpu_via_init(int phys_apicid, unsigned long start_eip)
         return (send_status | accept_status);
 }
 
+void smp_announce(void)
+{
+        int num_nodes = num_online_nodes();
+
+        printk(KERN_INFO "x86: Booted up %d node%s, %d CPUs\n",
+               num_nodes, (num_nodes > 1 ? "s" : ""), num_online_cpus());
+}
+
 /* reduce the number of lines printed when booting a large cpu count system */
 static void announce_cpu(int cpu, int apicid)
 {
         static int current_node = -1;
         int node = early_cpu_to_node(cpu);
-        static int width;
+        static int width, node_width;
 
         if (!width)
                 width = num_digits(num_possible_cpus()) + 1; /* + '#' sign */
 
+        if (!node_width)
+                node_width = num_digits(num_possible_nodes()) + 1; /* + '#' */
+
+        if (cpu == 1)
+                printk(KERN_INFO "x86: Booting SMP configuration:\n");
+
         if (system_state == SYSTEM_BOOTING) {
                 if (node != current_node) {
                         if (current_node > (-1))
-                                pr_cont(" OK\n");
+                                pr_cont("\n");
                         current_node = node;
-                        pr_info("Booting Node %3d, Processors:", node);
+
+                        printk(KERN_INFO ".... node %*s#%d, CPUs:  ",
+                               node_width - num_digits(node), " ", node);
                 }
 
                 /* Add padding for the BSP */
@@ -671,8 +687,6 @@ static void announce_cpu(int cpu, int apicid)
 
                 pr_cont("%*s#%d", width - num_digits(cpu), " ", cpu);
 
-                if (cpu == num_present_cpus() - 1)
-                        pr_cont(" OK\n");
         } else
                 pr_info("Booting Node %d Processor %d APIC 0x%x\n",
                         node, cpu, apicid);
diff --git a/arch/x86/lib/misc.c b/arch/x86/lib/misc.c
index bc35cde9769f..76b373af03f0 100644
--- a/arch/x86/lib/misc.c
+++ b/arch/x86/lib/misc.c
@@ -1,11 +1,21 @@
+/*
+ * Count the digits of @val including a possible sign.
+ *
+ * (Typed on and submitted from hpa's mobile phone.)
+ */
 int num_digits(int val)
 {
-        int digits = 0;
+        int m = 10;
+        int d = 1;
 
-        while (val) {
-                val /= 10;
-                digits++;
+        if (val < 0) {
+                d++;
+                val = -val;
         }
 
-        return digits;
+        while (val >= m) {
+                m *= 10;
+                d++;
+        }
+        return d;
 }
diff --git a/kernel/smp.c b/kernel/smp.c
index 0564571dcdf7..f5768b0c816a 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -524,6 +524,11 @@ void __init setup_nr_cpu_ids(void)
         nr_cpu_ids = find_last_bit(cpumask_bits(cpu_possible_mask),NR_CPUS) + 1;
 }
 
+void __weak smp_announce(void)
+{
+        printk(KERN_INFO "Brought up %d CPUs\n", num_online_cpus());
+}
+
 /* Called by boot processor to activate the rest. */
 void __init smp_init(void)
 {
@@ -540,7 +545,7 @@ void __init smp_init(void)
         }
 
         /* Any cleanup work */
-        printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus());
+        smp_announce();
         smp_cpus_done(setup_max_cpus);
 }