X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=mm%2Fhugetlb.c;h=618e98304080a8bdb3ace929c8dcb8938662fad4;hb=8054576dca7e76dd1f58c525af3309cfc9c74454;hp=d143ab67be444119b6240c5f8461a72fe2fc9647;hpb=e892873c5d7431324d98dfd3ed1572a2948046be;p=mv-sheeva.git

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index d143ab67be4..618e9830408 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -219,6 +219,35 @@ static pgoff_t vma_hugecache_offset(struct hstate *h,
 			(vma->vm_pgoff >> huge_page_order(h));
 }
 
+/*
+ * Return the size of the pages allocated when backing a VMA. In the majority
+ * cases this will be same size as used by the page table entries.
+ */
+unsigned long vma_kernel_pagesize(struct vm_area_struct *vma)
+{
+	struct hstate *hstate;
+
+	if (!is_vm_hugetlb_page(vma))
+		return PAGE_SIZE;
+
+	hstate = hstate_vma(vma);
+
+	return 1UL << (hstate->order + PAGE_SHIFT);
+}
+
+/*
+ * Return the page size being used by the MMU to back a VMA. In the majority
+ * of cases, the page size used by the kernel matches the MMU size. On
+ * architectures where it differs, an architecture-specific version of this
+ * function is required.
+ */
+#ifndef vma_mmu_pagesize
+unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
+{
+	return vma_kernel_pagesize(vma);
+}
+#endif
+
 /*
  * Flags for MAP_PRIVATE reservations.  These are stored in the bottom
  * bits of the reservation map pointer, which are always clear due to
@@ -371,8 +400,10 @@ static void clear_huge_page(struct page *page,
 {
 	int i;
 
-	if (unlikely(sz > MAX_ORDER_NR_PAGES))
-		return clear_gigantic_page(page, addr, sz);
+	if (unlikely(sz > MAX_ORDER_NR_PAGES)) {
+		clear_gigantic_page(page, addr, sz);
+		return;
+	}
 
 	might_sleep();
 	for (i = 0; i < sz/PAGE_SIZE; i++) {
@@ -404,8 +435,10 @@ static void copy_huge_page(struct page *dst, struct page *src,
 	int i;
 	struct hstate *h = hstate_vma(vma);
 
-	if (unlikely(pages_per_huge_page(h) > MAX_ORDER_NR_PAGES))
-		return copy_gigantic_page(dst, src, addr, vma);
+	if (unlikely(pages_per_huge_page(h) > MAX_ORDER_NR_PAGES)) {
+		copy_gigantic_page(dst, src, addr, vma);
+		return;
+	}
 
 	might_sleep();
 	for (i = 0; i < pages_per_huge_page(h); i++) {
@@ -972,7 +1005,7 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
 	return page;
 }
 
-__attribute__((weak)) int alloc_bootmem_huge_page(struct hstate *h)
+int __weak alloc_bootmem_huge_page(struct hstate *h)
 {
 	struct huge_bootmem_page *m;
 	int nr_nodes = nodes_weight(node_online_map);
@@ -991,8 +1024,7 @@ __attribute__((weak)) int alloc_bootmem_huge_page(struct hstate *h)
 			 * puts them into the mem_map).
 			 */
 			m = addr;
-			if (m)
-				goto found;
+			goto found;
 		}
 		hstate_next_node(h);
 		nr_nodes--;
@@ -1796,6 +1828,7 @@ void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,
 static int unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma,
 				struct page *page, unsigned long address)
 {
+	struct hstate *h = hstate_vma(vma);
 	struct vm_area_struct *iter_vma;
 	struct address_space *mapping;
 	struct prio_tree_iter iter;
@@ -1805,7 +1838,7 @@ static int unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma,
 	 * vm_pgoff is in PAGE_SIZE units, hence the different calculation
 	 * from page cache lookup which is in HPAGE_SIZE units.
 	 */
-	address = address & huge_page_mask(hstate_vma(vma));
+	address = address & huge_page_mask(h);
 	pgoff = ((address - vma->vm_start) >> PAGE_SHIFT)
 		+ (vma->vm_pgoff >> PAGE_SHIFT);
 	mapping = (struct address_space *)page_private(page);
@@ -1824,7 +1857,7 @@ static int unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma,
 		 */
 		if (!is_vma_resv_set(iter_vma, HPAGE_RESV_OWNER))
 			unmap_hugepage_range(iter_vma,
-				address, address + HPAGE_SIZE,
+				address, address + huge_page_size(h),
 				page);
 	}