* [PATCH] powerpc: Initialise paca.data_offset with poison
@ 2012-09-08 1:31 Michael Ellerman
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From: Michael Ellerman @ 2012-09-08 1:31 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Anton Blanchard
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>
---
arch/powerpc/kernel/paca.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
index fbe1a12..cd6da85 100644
--- a/arch/powerpc/kernel/paca.c
+++ b/arch/powerpc/kernel/paca.c
@@ -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 */
--
1.7.9.5
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