[PATCH] mm: split highorder pages
[linux-2.6.git] / arch / ppc / kernel / dma-mapping.c
index 685fd0defe23484772bf89e99b772bd9cbd65486..61465ec88bc7268b0325001bac308c28d1db8588 100644 (file)
@@ -223,6 +223,8 @@ __dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp)
                pte_t *pte = consistent_pte + CONSISTENT_OFFSET(vaddr);
                struct page *end = page + (1 << order);
 
+               split_page(page, order);
+
                /*
                 * Set the "dma handle"
                 */
@@ -231,7 +233,6 @@ __dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp)
                do {
                        BUG_ON(!pte_none(*pte));
 
-                       set_page_count(page, 1);
                        SetPageReserved(page);
                        set_pte_at(&init_mm, vaddr,
                                   pte, mk_pte(page, pgprot_noncached(PAGE_KERNEL)));
@@ -244,7 +245,6 @@ __dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp)
                 * Free the otherwise unused pages.
                 */
                while (page < end) {
-                       set_page_count(page, 1);
                        __free_page(page);
                        page++;
                }