Messages in this thread | | | Date | Mon, 23 Nov 2015 12:32:41 +0000 | From | Vladimir Murzin <> | Subject | Re: [RFC/PATCH] arm: do not skip SMP init calls on SMP_ON_UP case |
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On 23/11/15 12:06, Nikita Yushchenko wrote: > 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.
I *guess* cpus node [1] in your dts has more than one cpu entry, could you check please?
[1] Documentation/devicetree/bindings/arm/cpus.txt
Vladimir
> > Will try to check mainline (although not sure if that will be possible > on available custom hardware) > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel >
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