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Commit 7c15d9bb authored by Laura Abbott's avatar Laura Abbott Committed by Kees Cook
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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: default avatarLaura Abbott <labbott@redhat.com>
Signed-off-by: default avatarKees Cook <keescook@chromium.org>
parent 523d939e

include/linux/mmzone.h

+2 −0
Original line number Diff line number Diff line
@@ -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) \