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Message-Id: <1468965604-25023-1-git-send-email-labbott@redhat.com>
Date: Tue, 19 Jul 2016 15:00:04 -0700
From: Laura Abbott <labbott@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: Laura Abbott <labbott@...hat.com>,
Kees Cook <keescook@...omium.org>,
Rik van Riel <riel@...hat.com>,
Casey Schaufler <casey@...aufler-ca.com>,
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Andrea Arcangeli <aarcange@...hat.com>,
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Laura Abbott <labbott@...oraproject.org>,
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Subject: [PATCH] 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@...hat.com>
---
Here's an explicit patch, slightly different than what I posted before. It can
be kept separate or folded in as needed.
---
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
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