When calling to early_setup(), we picks "boot_paca" up for the
master CPU and initialize that with initialise_paca(). At the
point, SLB shadow buffer isn't populated yet. Updating the SLB
shadow buffer should corrupt what we had in physical address 0
where the trap instruction is usually stored.
Signed-off-by: Gavin Shan <gws...@linux.vnet.ibm.com>
---
arch/powerpc/kernel/paca.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
index d6e195e..048a6ee 100644
--- a/arch/powerpc/kernel/paca.c
+++ b/arch/powerpc/kernel/paca.c
@@ -115,6 +115,9 @@ static struct slb_shadow * __init init_slb_shadow(int cpu)
{
struct slb_shadow *s = &slb_shadow[cpu];
+ if (!slb_shadow)
+ return NULL;
+
s->persistent = cpu_to_be32(SLB_NUM_BOLTED);
s->buffer_length = cpu_to_be32(sizeof(*s));
--
1.8.3.2
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