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mm: Add is_migrate_cma_page

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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 7c15d9bb82)
Signed-off-by: Alex Shi <alex.shi@linaro.org>
This commit is contained in:
Laura Abbott 2016-07-19 15:00:04 -07:00 committed by Alex Shi
parent 21a48ffe4d
commit 472dd6904d
1 changed files with 2 additions and 0 deletions
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2
include/linux/mmzone.h
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@ -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) \