1 files changed, 5 insertions, 1 deletions

diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index 0c37f16b6950..1a017f00e867 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -77,10 +77,14 @@ void __init dma32_reserve_bootmem(void)
         if (end_pfn <= MAX_DMA32_PFN)
                 return;
 
+        /*
+         * check aperture_64.c allocate_aperture() for reason about
+         * using 512M as goal
+         */
         align = 64ULL<<20;
         size = round_up(dma32_bootmem_size, align);
         dma32_bootmem_ptr = __alloc_bootmem_nopanic(size, align,
-                                 __pa(MAX_DMA_ADDRESS));
+                                 512ULL<<20);
         if (dma32_bootmem_ptr)
                 dma32_bootmem_size = size;
         else