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powerpc: Initialise paca.data_offset with poison
It's possible for the cpu_possible_mask to change between the time we initialise the pacas and the time we setup per_cpu areas. Obviously impossible cpus shouldn't ever be running, but stranger things have happened. So be paranoid and initialise data_offset with a poison value in case we don't set it up later. Based on a patch from Anton Blanchard. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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@ -142,6 +142,7 @@ void __init initialise_paca(struct paca_struct *new_paca, int cpu)
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new_paca->hw_cpu_id = 0xffff;
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new_paca->kexec_state = KEXEC_STATE_NONE;
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new_paca->__current = &init_task;
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new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL;
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#ifdef CONFIG_PPC_STD_MMU_64
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new_paca->slb_shadow_ptr = &slb_shadow[cpu];
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#endif /* CONFIG_PPC_STD_MMU_64 */
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