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authorChangbin Du <changbin.du@intel.com>2017-11-15 17:32:53 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-15 18:21:02 -0800
commit41710443f790b5f7f5305eba99dacce88e259f4c (patch)
treef5d90cb7f7e1bccb1f6080c8229d5487c1b08a37
parentc413af877ffa8a8c28796c9d156cf40a83e58994 (diff)
downloadlinux-41710443f790b5f7f5305eba99dacce88e259f4c.tar.bz2
mm: update comments for struct page.mapping
struct page.mapping can be NULL or points to one object of type address_space, anon_vma or KSM private structure. Link: http://lkml.kernel.org/r/1506485067-15954-1-git-send-email-changbin.du@intel.com Signed-off-by: Changbin Du <changbin.du@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/mm_types.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index c85f11dafd56..d1b8e8f97fc2 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -48,8 +48,10 @@ struct page {
* inode address_space, or NULL.
* If page mapped as anonymous
* memory, low bit is set, and
- * it points to anon_vma object:
- * see PAGE_MAPPING_ANON below.
+ * it points to anon_vma object
+ * or KSM private structure. See
+ * PAGE_MAPPING_ANON and
+ * PAGE_MAPPING_KSM.
*/
void *s_mem; /* slab first object */
atomic_t compound_mapcount; /* first tail page */