[PATCH] mm: split highorder pages

[linux-2.6.git] / arch / ppc / kernel / dma-mapping.c

diff --git a/arch/ppc/kernel/dma-mapping.c b/arch/ppc/kernel/dma-mapping.c
index b566d982806c937ba8ca7e55c01b007a32777477..61465ec88bc7268b0325001bac308c28d1db8588 100644 (file)
--- a/arch/ppc/kernel/dma-mapping.c
+++ b/arch/ppc/kernel/dma-mapping.c
@@ -115,7 +115,7 @@ static struct vm_region consistent_head = {
 };
 
 static struct vm_region *
-vm_region_alloc(struct vm_region *head, size_t size, int gfp)
+vm_region_alloc(struct vm_region *head, size_t size, gfp_t gfp)
 {
        unsigned long addr = head->vm_start, end = head->vm_end - size;
        unsigned long flags;
@@ -173,7 +173,7 @@ static struct vm_region *vm_region_find(struct vm_region *head, unsigned long ad
  * virtual and bus address for that space.
  */
 void *
-__dma_alloc_coherent(size_t size, dma_addr_t *handle, int gfp)
+__dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp)
 {
        struct page *page;
        struct vm_region *c;
@@ -223,6 +223,8 @@ __dma_alloc_coherent(size_t size, dma_addr_t *handle, int 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, int 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, int gfp)
                 * Free the otherwise unused pages.
                 */
                while (page < end) {
-                       set_page_count(page, 1);
                        __free_page(page);
                        page++;
                }
@@ -335,8 +335,6 @@ static int __init dma_alloc_init(void)
        pte_t *pte;
        int ret = 0;
 
-       spin_lock(&init_mm.page_table_lock);
-
        do {
                pgd = pgd_offset(&init_mm, CONSISTENT_BASE);
                pmd = pmd_alloc(&init_mm, pgd, CONSISTENT_BASE);
@@ -347,7 +345,7 @@ static int __init dma_alloc_init(void)
                }
                WARN_ON(!pmd_none(*pmd));
 
-               pte = pte_alloc_kernel(&init_mm, pmd, CONSISTENT_BASE);
+               pte = pte_alloc_kernel(pmd, CONSISTENT_BASE);
                if (!pte) {
                        printk(KERN_ERR "%s: no pte tables\n", __func__);
                        ret = -ENOMEM;
@@ -357,8 +355,6 @@ static int __init dma_alloc_init(void)
                consistent_pte = pte;
        } while (0);
 
-       spin_unlock(&init_mm.page_table_lock);
-
        return ret;
 }
 
@@ -401,10 +397,10 @@ EXPORT_SYMBOL(__dma_sync);
 static inline void __dma_sync_page_highmem(struct page *page,
                unsigned long offset, size_t size, int direction)
 {
-       size_t seg_size = min((size_t)PAGE_SIZE, size) - offset;
+       size_t seg_size = min((size_t)(PAGE_SIZE - offset), size);
        size_t cur_size = seg_size;
        unsigned long flags, start, seg_offset = offset;
-       int nr_segs = PAGE_ALIGN(size + (PAGE_SIZE - offset))/PAGE_SIZE;
+       int nr_segs = 1 + ((size - seg_size) + PAGE_SIZE - 1)/PAGE_SIZE;
        int seg_nr = 0;
 
        local_irq_save(flags);