Commit 472dd690 authored Jul 19, 2016 by Laura Abbott Committed by Alex Shi Aug 27, 2016

mm: Add is_migrate_cma_page

Code such as hardened user copy[1] needs a way to tell if a
page is CMA or not. Add is_migrate_cma_page in a similar way
to is_migrate_isolate_page.

[1]http://article.gmane.org/gmane.linux.kernel.mm/155238



Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
(cherry picked from commit 7c15d9bb8231f998ae7dc0b72415f5215459f7fb)
Signed-off-by: Alex Shi <alex.shi@linaro.org>

parent 21a48ffe

include/linux/mmzone.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -65,8 +65,10 @@ enum {

		#ifdef CONFIG_CMA
		# define is_migrate_cma(migratetype) unlikely((migratetype) == MIGRATE_CMA)
		# define is_migrate_cma_page(_page) (get_pageblock_migratetype(_page) == MIGRATE_CMA)
		#else
		# define is_migrate_cma(migratetype) false
		# define is_migrate_cma_page(_page) false
		#endif

		#define for_each_migratetype_order(order, type) \