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kernel/smp: Tell the user we're bringing up secondary CPUs

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Currently we don't print anything before starting to bring up secondary
CPUs. This can be confusing if it takes a long time to bring up the
secondaries, or if the kernel crashes while doing so and produces no
further output.

On x86 they work around this by detecting when the first secondary CPU
comes up and printing a message (see announce_cpu()). But doing it in
smp_init() is simpler and works for all arches.

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/1477460275-8266-3-git-send-email-mpe@ellerman.id.au
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Michael Ellerman 2016-10-26 16:37:55 +11:00 committed by Thomas Gleixner
parent 92b2327829
commit 51111dce25
1 changed files with 2 additions and 0 deletions
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kernel/smp.c
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@ -555,6 +555,8 @@ void __init smp_init(void)
idle_threads_init(); idle_threads_init();
cpuhp_threads_init(); cpuhp_threads_init();
pr_info("Bringing up secondary CPUs ...\n");
/* FIXME: This should be done in userspace --RR */ /* FIXME: This should be done in userspace --RR */
for_each_present_cpu(cpu) { for_each_present_cpu(cpu) {
if (num_online_cpus() >= setup_max_cpus) if (num_online_cpus() >= setup_max_cpus)