x86: Improve the printout of the SMP bootup CPU table

As the new x86 CPU bootup printout format code maintainer, I am
taking immediate action to improve and clean (and thus indulge
my OCD) the reporting of the cores when coming up online.

Fix padding to a right-hand alignment, cleanup code and bind
reporting width to the max number of supported CPUs on the
system, like this:

 [    0.074509] smpboot: Booting Node   0, Processors:      #1  #2  #3  #4  #5  #6  #7 OK
 [    0.644008] smpboot: Booting Node   1, Processors:  #8  #9 #10 #11 #12 #13 #14 #15 OK
 [    1.245006] smpboot: Booting Node   2, Processors: #16 #17 #18 #19 #20 #21 #22 #23 OK
 [    1.864005] smpboot: Booting Node   3, Processors: #24 #25 #26 #27 #28 #29 #30 #31 OK
 [    2.489005] smpboot: Booting Node   4, Processors: #32 #33 #34 #35 #36 #37 #38 #39 OK
 [    3.093005] smpboot: Booting Node   5, Processors: #40 #41 #42 #43 #44 #45 #46 #47 OK
 [    3.698005] smpboot: Booting Node   6, Processors: #48 #49 #50 #51 #52 #53 #54 #55 OK
 [    4.304005] smpboot: Booting Node   7, Processors: #56 #57 #58 #59 #60 #61 #62 #63 OK
 [    4.961413] Brought up 64 CPUs

and this:

 [    0.072367] smpboot: Booting Node   0, Processors:    #1 #2 #3 #4 #5 #6 #7 OK
 [    0.686329] Brought up 8 CPUs

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Libin <huawei.libin@huawei.com>
Cc: wangyijing@huawei.com
Cc: fenghua.yu@intel.com
Cc: guohanjun@huawei.com
Cc: paul.gortmaker@windriver.com
Link: http://lkml.kernel.org/r/20130927143554.GF4422@pd.tnic
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/include/asm/misc.h b/arch/x86/include/asm/misc.h
new file mode 100644 (file)
index 0000000..475f5bb
--- /dev/null
+++ b/arch/x86/include/asm/misc.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_X86_MISC_H
+#define _ASM_X86_MISC_H
+
+int num_digits(int val);
+
+#endif /* _ASM_X86_MISC_H */

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 6cacab6..d41f3ba 100644 (file)
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -73,11 +73,10 @@
 #include <asm/setup.h>
 #include <asm/uv/uv.h>
 #include <linux/mc146818rtc.h>
-
 #include <asm/smpboot_hooks.h>
 #include <asm/i8259.h>
-
 #include <asm/realmode.h>
+#include <asm/misc.h>
 
 /* State of each CPU */
 DEFINE_PER_CPU(int, cpu_state) = { 0 };
@@ -653,17 +652,27 @@ 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);
+       static int width;
+
+       if (!width)
+               width = num_digits(num_possible_cpus()) + 1; /* + '#' sign */
 
        if (system_state == SYSTEM_BOOTING) {
                if (node != current_node) {
                        if (current_node > (-1))
                                pr_cont(" OK\n");
                        current_node = node;
-                       pr_info("Booting Node %3d, Processors ", node);
+                       pr_info("Booting Node %3d, Processors:", node);
                }
-               pr_cont(" #%4d%s", cpu, cpu == max_cpu_present ? " OK\n" : "");
-               return;
+
+               /* Add padding for the BSP */
+               if (cpu == 1)
+                       pr_cont("%*s", width + 1, " ");
+
+               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/Makefile b/arch/x86/lib/Makefile
index 96b2c66..992d63b 100644 (file)
--- a/arch/x86/lib/Makefile
+++ b/arch/x86/lib/Makefile
@@ -16,7 +16,7 @@ clean-files := inat-tables.c
 
 obj-$(CONFIG_SMP) += msr-smp.o cache-smp.o
 
-lib-y := delay.o
+lib-y := delay.o misc.o
 lib-y += thunk_$(BITS).o
 lib-y += usercopy_$(BITS).o usercopy.o getuser.o putuser.o
 lib-y += memcpy_$(BITS).o

diff --git a/arch/x86/lib/misc.c b/arch/x86/lib/misc.c
new file mode 100644 (file)
index 0000000..bc35cde
--- /dev/null
+++ b/arch/x86/lib/misc.c
@@ -0,0 +1,11 @@
+int num_digits(int val)
+{
+       int digits = 0;
+
+       while (val) {
+               val /= 10;
+               digits++;
+       }
+
+       return digits;
+}