[PATCH] mm: Add is_migrate_cma_page
From: Laura Abbott <hidden>
Date: 2016-07-19 22:00:19
Also in:
linux-arch, linux-mm, linuxppc-dev, lkml, sparclinux
Subsystem:
memory management - core, memory management - mglru (multi-gen lru), the rest · Maintainers:
Andrew Morton, David Hildenbrand, Linus Torvalds
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 <redacted> --- Here's an explicit patch, slightly different than what I posted before. It can be kept separate or folded in as needed. --- include/linux/mmzone.h | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 02069c2..c8478b2 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h@@ -68,8 +68,10 @@ extern char * const migratetype_names[MIGRATE_TYPES]; #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) \
--
2.7.4