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Commit 407821a3 authored by Michael Ellerman's avatar Michael Ellerman Committed by Benjamin Herrenschmidt
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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: default avatarMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 06c88766

arch/powerpc/kernel/paca.c

+1 −0
Original line number Diff line number Diff line
@@ -142,6 +142,7 @@ void __init initialise_paca(struct paca_struct *new_paca, int cpu) 
	new_paca->hw_cpu_id = 0xffff;

	new_paca->kexec_state = KEXEC_STATE_NONE;

	new_paca->__current = &init_task;

	new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL;

#ifdef CONFIG_PPC_STD_MMU_64

	new_paca->slb_shadow_ptr = &slb_shadow[cpu];

#endif /* CONFIG_PPC_STD_MMU_64 */