[PATCH 3/3] mincore: Introduce the MINCORE_SWAP bit

[Pavel Emelyanov <xemul@parallels.com>]

When a page is swapped out it should be included in the memory dump,
but the existing mincore() doesn't report the set bit for such pages.

Thus add a bit for swapped out pages.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

---
 include/linux/mman.h |    1 +
 mm/mincore.c         |    2 +-
 2 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/include/linux/mman.h b/include/linux/mman.h
index 9d1de16..bfe4038 100644
--- a/include/linux/mman.h
+++ b/include/linux/mman.h
@@ -12,6 +12,7 @@
 
 #define MINCORE_RESIDENT	0x1
 #define MINCORE_ANON		0x2
+#define MINCORE_SWAP		0x4
 
 #ifdef __KERNEL__
 #include <linux/mm.h>
diff --git a/mm/mincore.c b/mm/mincore.c
index 3163dfb..82c5c3e 100644
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -146,7 +146,7 @@ static void mincore_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
 			} else {
 #ifdef CONFIG_SWAP
 				pgoff = entry.val;
-				*vec = mincore_page(&swapper_space, pgoff);
+				*vec = mincore_page(&swapper_space, pgoff) | MINCORE_SWAP;
 #else
 				WARN_ON(1);
 				*vec = MINCORE_RESIDENT;
-- 
1.5.5.6

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