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

[Kirill A. Shutemov]

The patch adds description for page flags policies.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
 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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/