Commit-ID: 6a4e24518c8a10f78f44da219835239cb5aca90d Gitweb: http://git.kernel.org/tip/6a4e24518c8a10f78f44da219835239cb5aca90d Author: Thomas Gleixner <t...@linutronix.de> AuthorDate: Wed, 13 Jul 2016 17:16:03 +0000 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Thu, 14 Jul 2016 09:34:25 +0200
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 <t...@linutronix.de> Signed-off-by: Anna-Maria Gleixner <anna-ma...@linutronix.de> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: r...@linutronix.de Link: http://lkml.kernel.org/r/20160713153332.896450...@linutronix.de Signed-off-by: Ingo Molnar <mi...@kernel.org> --- kernel/cpu.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/kernel/cpu.c b/kernel/cpu.c index 7b61887..fe71ce4 100644 --- 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; /*
