cpu/hotplug: Handle early registration gracefully

We switched the hotplug machinery to smpboot threads. Early registration of
hotplug callbacks, i.e. from do_pre_smp_initcalls(), happens before the
threads are initialized. Instead of moving the thread init, we simply handle
it in the hotplug code itself and invoke the function directly.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153332.896450738@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 7b61887f7ccdf57fdcb3083574a56c5580110d73..fe71ce4e60f138c161f0e5c1bba5e17842081b0e 100644 (file)
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -517,6 +517,13 @@ static int cpuhp_invoke_ap_callback(int cpu, enum cpuhp_state state,
        if (!cpu_online(cpu))
                return 0;
 
+       /*
+        * If we are up and running, use the hotplug thread. For early calls
+        * we invoke the thread function directly.
+        */
+       if (!st->thread)
+               return cpuhp_invoke_callback(cpu, state, cb);
+
        st->cb_state = state;
        st->cb = cb;
        /*