[PATCH] mm: split highorder pages

Have an explicit mm call to split higher order pages into individual pages.
 Should help to avoid bugs and be more explicit about the code's intention.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: David Howells <dhowells@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Chris Zankel <chris@zankel.net>
Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/arm/mm/consistent.c b/arch/arm/mm/consistent.c
index c2ee18d..8a1bfcd 100644
--- a/arch/arm/mm/consistent.c
+++ b/arch/arm/mm/consistent.c
@@ -223,6 +223,8 @@
 		pte = consistent_pte[idx] + off;
 		c->vm_pages = page;
 
+		split_page(page, order);
+
 		/*
 		 * Set the "dma handle"
 		 */
@@ -231,7 +233,6 @@
 		do {
 			BUG_ON(!pte_none(*pte));
 
-			set_page_count(page, 1);
 			/*
 			 * x86 does not mark the pages reserved...
 			 */
@@ -250,7 +251,6 @@
 		 * Free the otherwise unused pages.
 		 */
 		while (page < end) {
-			set_page_count(page, 1);
 			__free_page(page);
 			page++;
 		}