[POWERPC] Move allocation of cell IOMMU pad page

There's no need to allocate the pad page unless we're going to actually
use it - so move the allocation to where we know we're going to use it.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/arch/powerpc/platforms/cell/iommu.c b/arch/powerpc/platforms/cell/iommu.c
index 555d264..8e57e1a 100644 (file)
--- a/arch/powerpc/platforms/cell/iommu.c
+++ b/arch/powerpc/platforms/cell/iommu.c
@@ -344,12 +344,6 @@ static void cell_iommu_setup_page_tables(struct cbe_iommu *iommu,
        iommu->ptab = page_address(page);
        memset(iommu->ptab, 0, ptab_size);
 
-       /* allocate a bogus page for the end of each mapping */
-       page = alloc_pages_node(iommu->nid, GFP_KERNEL, 0);
-       BUG_ON(!page);
-       iommu->pad_page = page_address(page);
-       clear_page(iommu->pad_page);
-
        /* number of pages needed for a page table */
        n_pte_pages = (pages_per_segment *
                       sizeof(unsigned long)) >> IOMMU_PAGE_SHIFT;
@@ -463,6 +457,7 @@ cell_iommu_setup_window(struct cbe_iommu *iommu, struct device_node *np,
                        unsigned long pte_offset)
 {
        struct iommu_window *window;
+       struct page *page;
        u32 ioid;
 
        ioid = cell_iommu_get_ioid(np);
@@ -501,6 +496,11 @@ cell_iommu_setup_window(struct cbe_iommu *iommu, struct device_node *np,
         * This code also assumes that we have a window that starts at 0,
         * which is the case on all spider based blades.
         */
+       page = alloc_pages_node(iommu->nid, GFP_KERNEL, 0);
+       BUG_ON(!page);
+       iommu->pad_page = page_address(page);
+       clear_page(iommu->pad_page);
+
        __set_bit(0, window->table.it_map);
        tce_build_cell(&window->table, window->table.it_offset, 1,
                       (unsigned long)iommu->pad_page, DMA_TO_DEVICE);