OK, please try this and let me know if it helps:
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 1c93c25..98d7bf9 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -75,11 +75,10 @@ static inline pte_t *virt_to_kpte(unsigned long vaddr)
int page_is_ram(unsigned long pfn)
{
- unsigned long paddr = (pfn << PAGE_SHIFT);
-
#ifndef CONFIG_PPC64 /* XXX for now */
- return paddr < __pa(high_memory);
+ return pfn < max_pfn;
#else
+ unsigned long paddr = (pfn << PAGE_SHIFT);
int i;
for (i=0; i < lmb.memory.cnt; i++) {
unsigned long base;
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