cpu/hotplug: Convert to a state machine for the control processor

Move the split out steps into a callback array and let the cpu_up/down
code iterate through the array functions. For now most of the
callbacks are asymmetric to resemble the current hotplug maze.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arch@vger.kernel.org
Cc: Rik van Riel <riel@redhat.com>
Cc: Rafael Wysocki <rafael.j.wysocki@intel.com>
Cc: "Srivatsa S. Bhat" <srivatsa@mit.edu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Turner <pjt@google.com>
Link: http://lkml.kernel.org/r/20160226182340.671816690@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 1 insertions, 14 deletions

diff --git a/init/main.c b/init/main.c
index 58c9e374704b..c2ea72362ee3 100644
--- a/init/main.c
+++ b/init/main.c
@@ -452,20 +452,6 @@ void __init parse_early_param(void)
         done = 1;
 }
 
-/*
- *      Activate the first processor.
- */
-
-static void __init boot_cpu_init(void)
-{
-        int cpu = smp_processor_id();
-        /* Mark the boot cpu "present", "online" etc for SMP and UP case */
-        set_cpu_online(cpu, true);
-        set_cpu_active(cpu, true);
-        set_cpu_present(cpu, true);
-        set_cpu_possible(cpu, true);
-}
-
 void __init __weak smp_setup_processor_id(void)
 {
 }
@@ -530,6 +516,7 @@ asmlinkage __visible void __init start_kernel(void)
         setup_command_line(command_line);
         setup_nr_cpu_ids();
         setup_per_cpu_areas();
+        boot_cpu_state_init();
         smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
 
         build_all_zonelists(NULL, NULL);