Commit-ID: 6a4e24518c8a10f78f44da219835239cb5aca90d Gitweb: http://git.kernel.org/tip/6a4e24518c8a10f78f44da219835239cb5aca90d Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx> AuthorDate: Wed, 13 Jul 2016 17:16:03 +0000 Committer: Ingo Molnar <mingo@xxxxxxxxxx> 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 <tglx@xxxxxxxxxxxxx> Signed-off-by: Anna-Maria Gleixner <anna-maria@xxxxxxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: rt@xxxxxxxxxxxxx Link: http://lkml.kernel.org/r/20160713153332.896450738@xxxxxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- 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; /* -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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