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[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>
This commit is contained in:
Michael Ellerman 2008-02-29 18:33:24 +11:00 committed by Arnd Bergmann
parent 08e024272e
commit edf441fb80
1 changed files with 6 additions and 6 deletions
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12
arch/powerpc/platforms/cell/iommu.c
View File

@ -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);