Messages in this thread | | | Date | Mon, 23 Nov 2015 12:03:18 +0000 | From | Russell King - ARM Linux <> | Subject | Re: [RFC/PATCH] arm: do not skip SMP init calls on SMP_ON_UP case |
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On Mon, Nov 23, 2015 at 02:59:06PM +0300, nyushchenko@dev.rtsoft.ru wrote: > From: Nikita Yushchenko <nyushchenko@dev.rtsoft.ru> > > While running an imx6s boasrd, I got following message in boot log: > > [ 0.032414] CPU1: failed to boot: -38 > > This looked strange: imx6s is singe-core and kernel perfectly knows > that. However, for some reason it tries to initialize CPU 1? > > I found this to be caused by > - CONFIG_SMP_ON_UP successfully detects that system is single core, > - this causes is_smp() to return false, > - this causes setup_arch() to skip smp_init_cpus() call, > - this skips board-specific code that sets cpu_possible mask.
Right, so you should end up with the possible and present masks containing just one CPU, which should prevent the kernel trying to bring any secondary CPUs online.
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