powerpc: mem_init should call memblock_is_reserved with phys_addr_t

This has been broken for a while but hasn't been an issue until
now because nobody was reserving regions at high addresses.

Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 57e545b84bf1..097b288779e2 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -337,8 +337,9 @@ void __init mem_init(void)
 
                 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
                 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
+                        phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT;
                         struct page *page = pfn_to_page(pfn);
-                        if (memblock_is_reserved(pfn << PAGE_SHIFT))
+                        if (memblock_is_reserved(paddr))
                                 continue;
                         ClearPageReserved(page);
                         init_page_count(page);