1 files changed, 1 insertions, 1 deletions

diff --git a/arch/i386/kernel/pci-dma.c b/arch/i386/kernel/pci-dma.c
index 3ebcea033623..30b754f7cbec 100644
--- a/arch/i386/kernel/pci-dma.c
+++ b/arch/i386/kernel/pci-dma.c
@@ -77,7 +77,7 @@ int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 {
         void __iomem *mem_base = NULL;
         int pages = size >> PAGE_SHIFT;
-        int bitmap_size = (pages + 31)/32;
+        int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);
 
         if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0)
                 goto out;