X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=mm%2Fhugetlb.c;h=107da3d809a87b0ad13e57256a050763a0b3d17b;hb=ffaba674090f287afe0c44fd8d978c64c03581a8;hp=5cb8bc7c80f709a8213309b9617c4a396854f057;hpb=08fba69986e20c1c9e5fe2e6064d146cc4f42480;p=safe%2Fjmp%2Flinux-2.6

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 5cb8bc7..107da3d 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -236,6 +236,19 @@ unsigned long vma_kernel_pagesize(struct vm_area_struct *vma)
 }
 
 /*
+ * 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
  * alignment.
@@ -387,8 +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++) {
@@ -420,8 +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++) {
@@ -988,7 +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);
@@ -1007,8 +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--;
@@ -2253,12 +2269,18 @@ void hugetlb_change_protection(struct vm_area_struct *vma,
 
 int hugetlb_reserve_pages(struct inode *inode,
 					long from, long to,
-					struct vm_area_struct *vma)
+					struct vm_area_struct *vma,
+					int acctflag)
 {
 	long ret, chg;
 	struct hstate *h = hstate_inode(inode);
 
-	if (vma && vma->vm_flags & VM_NORESERVE)
+	/*
+	 * Only apply hugepage reservation if asked. At fault time, an
+	 * attempt will be made for VM_NORESERVE to allocate a page
+	 * and filesystem quota without using reserves
+	 */
+	if (acctflag & VM_NORESERVE)
 		return 0;
 
 	/*
@@ -2283,13 +2305,31 @@ int hugetlb_reserve_pages(struct inode *inode,
 	if (chg < 0)
 		return chg;
 
+	/* There must be enough filesystem quota for the mapping */
 	if (hugetlb_get_quota(inode->i_mapping, chg))
 		return -ENOSPC;
+
+	/*
+	 * Check enough hugepages are available for the reservation.
+	 * Hand back the quota if there are not
+	 */
 	ret = hugetlb_acct_memory(h, chg);
 	if (ret < 0) {
 		hugetlb_put_quota(inode->i_mapping, chg);
 		return ret;
 	}
+
+	/*
+	 * Account for the reservations made. Shared mappings record regions
+	 * that have reservations as they are shared by multiple VMAs.
+	 * When the last VMA disappears, the region map says how much
+	 * the reservation was and the page cache tells how much of
+	 * the reservation was consumed. Private mappings are per-VMA and
+	 * only the consumed reservations are tracked. When the VMA
+	 * disappears, the original reservation is the VMA size and the
+	 * consumed reservations are stored in the map. Hence, nothing
+	 * else has to be done for private mappings here
+	 */
 	if (!vma || vma->vm_flags & VM_SHARED)
 		region_add(&inode->i_mapping->private_list, from, to);
 	return 0;