Messages in this thread | | | Date | Sat, 19 Oct 2013 18:02:39 -0400 | From | Steven Rostedt <> | Subject | Re: [PATCH 2/6] x86: allow to call text_poke_bp during boot |
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On Sat, 19 Oct 2013 14:33:50 -0700 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> wrote:
> > > It's used to convert the calls to mcount to nops. But maybe a better > > > thing to do is to check if we only have a single CPU: > > > > > > static void run_sync(void) > > > { > > > if (num_online_cpus() != 1) > > > > Hmm, to be more robust to handle our future "ideal" machines, perhaps > > this should be: > > > > /* Ideally we would like to run on zero CPUS! */ > > if (num_online_cpus() < 2) >
Bah! And for such a simple computation, I got it wrong.
/* Ideally we would like to run on zero CPUS! */ if (num_online_cpus > 1)
But I guess the question comes. If we are running on zero CPUS, should we perform the "on_each_cpu(do_sync_core, NULL, 1);" or not? Same goes with 5i-3 CPUS, or negative number CPUs. If we need to do on_each_cpu(), then I guess the != 1 will suffice.
-- Steve
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