Commit 41710443 authored Nov 15, 2017 by Changbin Du Committed by Linus Torvalds Nov 15, 2017

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>

parent c413af87

include/linux/mm_types.h

+4 −2

Original line number	Diff line number	Diff line
		@@ -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 */