Messages in this thread | | | Date | Mon, 23 Nov 2015 15:06:52 +0300 | From | Nikita Yushchenko <> | Subject | Re: [RFC/PATCH] arm: do not skip SMP init calls on SMP_ON_UP case |
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23.11.2015 15:03, Russell King - ARM Linux пишет: > 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.
Kernel that is running here still tries to init CPU 1 for some reason.
Will try to check mainline (although not sure if that will be possible on available custom hardware)
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