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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>
This commit is contained in:
Changbin Du 2017-11-15 17:32:53 -08:00 committed by Linus Torvalds
parent c413af877f
commit 41710443f7
1 changed files with 4 additions and 2 deletions
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6
include/linux/mm_types.h
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@ -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 */