From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
The comment on page->mapping is terse, and out of date (it does not
mention the possibility of PAGE_MAPPING_MOVABLE). Instead, point
the interested reader to page-flags.h where there is a much better
comment.
Signed-off-by: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
---
include/linux/mm_types.h | 12 +++---------
1 file changed, 3 insertions(+), 9 deletions(-)
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index c2294e6204e8..8c3b8cea22ee 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -50,15 +50,9 @@ struct page {
unsigned long flags; /* Atomic flags, some possibly
* updated asynchronously */
union {
- struct address_space *mapping; /* If low bit clear, points to
- * inode address_space, or NULL.
- * If page mapped as anonymous
- * memory, low bit is set, and
- * it points to anon_vma object
- * or KSM private structure. See
- * PAGE_MAPPING_ANON and
- * PAGE_MAPPING_KSM.
- */
+ /* See page-flags.h for the definition of PAGE_MAPPING_FLAGS */
+ struct address_space *mapping;
+
void *s_mem; /* slab first object */
atomic_t compound_mapcount; /* first tail page */
/* page_deferred_list().next -- second tail page */
--
2.15.1
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