Re: [PATCH] mm: Add is_migrate_cma_page
From: Kees Cook <hidden>
Date: 2016-07-19 22:40:52
Also in:
linux-arm-kernel, linux-mm, linuxppc-dev, lkml, sparclinux
On Tue, Jul 19, 2016 at 3:00 PM, Laura Abbott [off-list ref] wrote:
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>
Great, thanks!
--- Here's an explicit patch, slightly different than what I posted before. It can be kept separate or folded in as needed.
Assuming there's no objection, I'll add it to my tree and use the new macro. -Kees
quoted hunk ↗ jump to hunk
--- 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
-- Kees Cook Chrome OS & Brillo Security