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| author | Laura Abbott <labbott@redhat.com> | 2016-07-19 15:00:04 -0700 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2016-07-26 14:41:46 -0700 |
| commit | 7c15d9bb8231f998ae7dc0b72415f5215459f7fb (patch) | |
| tree | 1e94e7b8dfd0ff09928860d83af6b3492a158472 /include/linux/mmzone.h | |
| parent | 523d939ef98fd712632d93a5a2b588e477a7565e (diff) | |
| download | lwn-7c15d9bb8231f998ae7dc0b72415f5215459f7fb.tar.gz lwn-7c15d9bb8231f998ae7dc0b72415f5215459f7fb.zip | |
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: Laura Abbott <labbott@redhat.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'include/linux/mmzone.h')
| -rw-r--r-- | include/linux/mmzone.h | 2 |
1 files changed, 2 insertions, 0 deletions
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) \ |