[PATCH] mm: Add is_migrate_cma_page
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- To: linux-kernel@xxxxxxxxxxxxxxx
- Subject: [PATCH] mm: Add is_migrate_cma_page
- From: Laura Abbott <labbott@xxxxxxxxxx>
- Date: Tue, 19 Jul 2016 15:00:04 -0700
- Cc: Laura Abbott <labbott@xxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Rik van Riel <riel@xxxxxxxxxx>, Casey Schaufler <casey@xxxxxxxxxxxxxxxx>, PaX Team <pageexec@xxxxxxxxxxx>, Brad Spengler <spender@xxxxxxxxxxxxxx>, Russell King <linux@xxxxxxxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Will Deacon <will.deacon@xxxxxxx>, Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>, Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, Tony Luck <tony.luck@xxxxxxxxx>, Fenghua Yu <fenghua.yu@xxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, x86@xxxxxxxxxx, Christoph Lameter <cl@xxxxxxxxx>, Pekka Enberg <penberg@xxxxxxxxxx>, David Rientjes <rientjes@xxxxxxxxxx>, Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxx>, Mathias Krause <minipli@xxxxxxxxxxxxxx>, Jan Kara <jack@xxxxxxx>, Vitaly Wool <vitalywool@xxxxxxxxx>, Andrea Arcangeli <aarcange@xxxxxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>, Laura Abbott <labbott@xxxxxxxxxxxxxxxxx>, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, sparclinux@xxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, kernel-hardening@xxxxxxxxxxxxxxxxxx
- In-reply-to: <CAGXu5j+nHpHcYT8FyHNe6AFQCdakoSMW=UWDatyxhRK7CB7_=g@mail.gmail.com>
- List-id: <linux-ia64.vger.kernel.org>
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@xxxxxxxxxx>
---
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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