kernel/smp: Make the SMP boot message common on all arches

Currently after bringing up secondary CPUs all arches print "Brought up
%d CPUs". On x86 they also print the number of nodes that were brought
online.

It would be nice to also print the number of nodes on other arches.
Although we could override smp_announce() on the other ~10 NUMA aware
arches, it seems simpler to just always print the number of nodes. On
non-NUMA arches there is just always 1 node.

Having done that, smp_announce() is no longer weak, and seems small
enough to just pull directly into smp_init().

Also update the printing of "%d CPUs" to be smart when an SMP kernel is
booted on a single CPU system, or when only one CPU is available, eg:

   smp: Brought up 2 nodes, 1 CPU

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: akpm@osdl.org
Cc: jgross@suse.com
Cc: ak@linux.intel.com
Cc: tim.c.chen@linux.intel.com
Cc: len.brown@intel.com
Cc: peterz@infradead.org
Cc: richard@nod.at
Cc: jolsa@redhat.com
Cc: boris.ostrovsky@oracle.com
Cc: mgorman@techsingularity.net
Link: http://lkml.kernel.org/r/1477460275-8266-2-git-send-email-mpe@ellerman.id.au
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 42f5eb7b4f6c85251f4ab65d6de44268b6de06ea..b9f02383f372cac795d3c7d60514f544c28b90a8 100644 (file)
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -821,14 +821,6 @@ 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)
 {

diff --git a/kernel/smp.c b/kernel/smp.c
index 2d1f15d43022754a2b269a679b39940ceac43d0e..4323c5db7d26f49fc11422d466e65f0719da424b 100644 (file)
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -546,14 +546,10 @@ 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)
 {
+       int num_nodes, num_cpus;
        unsigned int cpu;
 
        idle_threads_init();
@@ -567,8 +563,13 @@ void __init smp_init(void)
                        cpu_up(cpu);
        }
 
+       num_nodes = num_online_nodes();
+       num_cpus  = num_online_cpus();
+       pr_info("Brought up %d node%s, %d CPU%s\n",
+               num_nodes, (num_nodes > 1 ? "s" : ""),
+               num_cpus,  (num_cpus  > 1 ? "s" : ""));
+
        /* Any cleanup work */
-       smp_announce();
        smp_cpus_done(setup_max_cpus);
 }