Messages in this thread Patch in this message | | | From | Kees Cook <> | Subject | [PATCH v4 01/12] mm: Add is_migrate_cma_page | Date | Wed, 20 Jul 2016 13:26:56 -0700 |
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From: Laura Abbott <labbott@redhat.com>
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> --- include/linux/mmzone.h | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 02069c23486d..c8478b29f070 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
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