Messages in this thread | | | Date | Thu, 06 Nov 2014 22:02:22 +0100 | From | Daniel Lezcano <> | Subject | Re: (bisected) Lock up on sh73a0/kzm9g on cpuidle initialization |
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On 11/06/2014 09:38 PM, Geert Uytterhoeven wrote: > When CONFIG_CPU_IDLE=y, the kernel locks up during cpuidle initialization > on Renesas sh73a0/kzm9g-reference, which has a dual-core Cortex-A9. > > Last message is: > > DMA: preallocated 256 KiB pool for atomic coherent allocations > > After this it's supposed to print: > > cpuidle: using governor ladder > cpuidle: using governor menu > > I've bisected this to commit 442bf3aaf55a91ebfec71da46a4ee10a3c905bcc > ("sched: Let the scheduler see CPU idle states"). > > Reverting that commit, and commit 83a0a96a5f26d974580fd7251043ff70c8f1823d > ("sched/fair: Leverage the idle state info when choosing the "idlest" > cpu") which > depends on it, fixes the problem. > > I saw the discussion "lockdep splat in CPU hotplug", so I enabled lockdep > debugging, but didn't see a lockdep splat.
Did you try the fix attached ?
https://lkml.org/lkml/2014/10/22/722
> I'm using CONFIG_TREE_RCU=y, as this is SMP without PREEMPT. > > Anyone with a clue?
> > In personal conversations with technical people, I call myself a hacker. But > when I'm talking to journalists I just say "programmer" or something like that. > -- Linus Torvalds >
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