linux-kernel - [PATCH 2/3] page-flags: add documentation for policies

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Date:	Fri,  2 Oct 2015 08:40:15 +0300
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH 2/3] page-flags: add documentation for policies

The patch adds description for page flags policies.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 include/linux/page-flags.h | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 465ca42af633..19e4129f00e5 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -133,7 +133,23 @@ enum pageflags {
 
 #ifndef __GENERATING_BOUNDS_H
 
-/* Page flags policies wrt compound pages */
+/*
+ * Page flags policies wrt compound pages
+ *
+ * PF_ANY:
+ *     the page flag is relevant for small, head and tail pages.
+ *
+ * PF_HEAD:
+ *     for compound page all operations related to the page flag applied to
+ *     head page.
+ *
+ * PF_NO_TAIL:
+ *     modifications of the page flag must be done on small or head pages,
+ *     checks can be done on tail pages too.
+ *
+ * PF_NO_COMPOUND:
+ *     the page flag is not relevant for compound pages.
+ */
 #define PF_ANY(page, enforce)	page
 #define PF_HEAD(page, enforce)	compound_head(page)
 #define PF_NO_TAIL(page, enforce) ({					\
-- 
2.5.1

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