1 files changed, 26 insertions, 2 deletions

diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index 2b5a399f6fa6..0f2d239d94c4 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -94,6 +94,9 @@ unsigned long htab_hash_mask;
 int mmu_linear_psize = MMU_PAGE_4K;
 int mmu_virtual_psize = MMU_PAGE_4K;
 int mmu_vmalloc_psize = MMU_PAGE_4K;
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+int mmu_vmemmap_psize = MMU_PAGE_4K;
+#endif
 int mmu_io_psize = MMU_PAGE_4K;
 int mmu_kernel_ssize = MMU_SEGSIZE_256M;
 int mmu_highuser_ssize = MMU_SEGSIZE_256M;
@@ -387,11 +390,32 @@ static void __init htab_init_page_sizes(void)
         }
 #endif /* CONFIG_PPC_64K_PAGES */
 
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+        /* We try to use 16M pages for vmemmap if that is supported
+         * and we have at least 1G of RAM at boot
+         */
+        if (mmu_psize_defs[MMU_PAGE_16M].shift &&
+            lmb_phys_mem_size() >= 0x40000000)
+                mmu_vmemmap_psize = MMU_PAGE_16M;
+        else if (mmu_psize_defs[MMU_PAGE_64K].shift)
+                mmu_vmemmap_psize = MMU_PAGE_64K;
+        else
+                mmu_vmemmap_psize = MMU_PAGE_4K;
+#endif /* CONFIG_SPARSEMEM_VMEMMAP */
+
         printk(KERN_DEBUG "Page orders: linear mapping = %d, "
-               "virtual = %d, io = %d\n",
+               "virtual = %d, io = %d"
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+               ", vmemmap = %d"
+#endif
+               "\n",
                mmu_psize_defs[mmu_linear_psize].shift,
                mmu_psize_defs[mmu_virtual_psize].shift,
-               mmu_psize_defs[mmu_io_psize].shift);
+               mmu_psize_defs[mmu_io_psize].shift
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+               ,mmu_psize_defs[mmu_vmemmap_psize].shift
+#endif
+               );
 
 #ifdef CONFIG_HUGETLB_PAGE
         /* Init large page size. Currently, we pick 16M or 1M depending