Pageattr comments for page_private usage.

Signed-off-by: Nick Piggin <npiggin@suse.de>

Index: linux-2.6/arch/i386/mm/pageattr.c
===================================================================
--- linux-2.6.orig/arch/i386/mm/pageattr.c
+++ linux-2.6/arch/i386/mm/pageattr.c
@@ -51,6 +51,10 @@ static struct page *split_large_page(uns
 	if (!base) 
 		return NULL;
 
+	/*
+	 * page_private is used to track the number of entries in
+	 * the page table page have non standard attributes.
+	 */
 	SetPagePrivate(base);
 	page_private(base) = 0;
 
Index: linux-2.6/arch/x86_64/mm/pageattr.c
===================================================================
--- linux-2.6.orig/arch/x86_64/mm/pageattr.c
+++ linux-2.6/arch/x86_64/mm/pageattr.c
@@ -45,6 +45,10 @@ static struct page *split_large_page(uns
 	pte_t *pbase;
 	if (!base) 
 		return NULL;
+	/*
+	 * page_private is used to track the number of entries in
+	 * the page table page have non standard attributes.
+	 */
 	SetPagePrivate(base);
 	page_private(base) = 0;
 
@@ -127,8 +131,8 @@ __change_page_attr(unsigned long address
 			set_pte(kpte, pfn_pte(pfn, prot));
 		} else {
  			/*
- 			 * split_large_page will take the reference for this change_page_attr
- 			 * on the split page.
+			 * split_large_page will take the reference for this
+			 * change_page_attr on the split page.
  			 */
 
 			struct page *split;