[PATCH 10/16] page-flags: define PG_swapbacked behavior on compound pages

From: Kirill A. Shutemov
Date: Thu Sep 24 2015 - 10:51:25 EST

PG_swapbacked is used for transparent huge pages. For head pages only.
Let's use PF_NO_TAIL policy.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
include/linux/page-flags.h | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 5ba8130fffb5..a31d682caeb2 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -266,9 +266,9 @@ PAGEFLAG(Foreign, foreign, PF_NO_COMPOUND);

PAGEFLAG(Reserved, reserved, PF_NO_COMPOUND)
-PAGEFLAG(SwapBacked, swapbacked, PF_ANY)
- __CLEARPAGEFLAG(SwapBacked, swapbacked, PF_ANY)
- __SETPAGEFLAG(SwapBacked, swapbacked, PF_ANY)
+PAGEFLAG(SwapBacked, swapbacked, PF_NO_TAIL)
+ __CLEARPAGEFLAG(SwapBacked, swapbacked, PF_NO_TAIL)
+ __SETPAGEFLAG(SwapBacked, swapbacked, PF_NO_TAIL)

* Private page markings that may be used by the filesystem that owns the page

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