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-rw-r--r--mm/memory.c71
1 files changed, 71 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 567bca80ea53..60e1c68d8218 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3645,3 +3645,74 @@ void might_fault(void)
}
EXPORT_SYMBOL(might_fault);
#endif
+
+#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
+static void clear_gigantic_page(struct page *page,
+ unsigned long addr,
+ unsigned int pages_per_huge_page)
+{
+ int i;
+ struct page *p = page;
+
+ might_sleep();
+ for (i = 0; i < pages_per_huge_page;
+ i++, p = mem_map_next(p, page, i)) {
+ cond_resched();
+ clear_user_highpage(p, addr + i * PAGE_SIZE);
+ }
+}
+void clear_huge_page(struct page *page,
+ unsigned long addr, unsigned int pages_per_huge_page)
+{
+ int i;
+
+ if (unlikely(pages_per_huge_page > MAX_ORDER_NR_PAGES)) {
+ clear_gigantic_page(page, addr, pages_per_huge_page);
+ return;
+ }
+
+ might_sleep();
+ for (i = 0; i < pages_per_huge_page; i++) {
+ cond_resched();
+ clear_user_highpage(page + i, addr + i * PAGE_SIZE);
+ }
+}
+
+static void copy_user_gigantic_page(struct page *dst, struct page *src,
+ unsigned long addr,
+ struct vm_area_struct *vma,
+ unsigned int pages_per_huge_page)
+{
+ int i;
+ struct page *dst_base = dst;
+ struct page *src_base = src;
+
+ for (i = 0; i < pages_per_huge_page; ) {
+ cond_resched();
+ copy_user_highpage(dst, src, addr + i*PAGE_SIZE, vma);
+
+ i++;
+ dst = mem_map_next(dst, dst_base, i);
+ src = mem_map_next(src, src_base, i);
+ }
+}
+
+void copy_user_huge_page(struct page *dst, struct page *src,
+ unsigned long addr, struct vm_area_struct *vma,
+ unsigned int pages_per_huge_page)
+{
+ int i;
+
+ if (unlikely(pages_per_huge_page > MAX_ORDER_NR_PAGES)) {
+ copy_user_gigantic_page(dst, src, addr, vma,
+ pages_per_huge_page);
+ return;
+ }
+
+ might_sleep();
+ for (i = 0; i < pages_per_huge_page; i++) {
+ cond_resched();
+ copy_user_highpage(dst + i, src + i, addr + i*PAGE_SIZE, vma);
+ }
+}
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */