The patch titled
Subject: mm: improve comment on page->mapping
has been added to the -mm tree. Its filename is
mm-improve-comment-on-page-mapping.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-improve-comment-on-page-mapping.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-improve-comment-on-page-mapping.patch
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------------------------------------------------------
From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
Subject: mm: improve comment on page->mapping
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mapping is terse, and out of date (it does not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.
Link: http://lkml.kernel.org/r/20171220155552.15884-5-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Acked-by: Christoph Lameter <cl@xxxxxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm_types.h | 12 +++---------
1 file changed, 3 insertions(+), 9 deletions(-)
diff -puN include/linux/mm_types.h~mm-improve-comment-on-page-mapping include/linux/mm_types.h
--- a/include/linux/mm_types.h~mm-improve-comment-on-page-mapping
+++ a/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 */
_
Patches currently in -mm which might be from mawilcox@xxxxxxxxxxxxx are
provide-useful-debugging-information-for-vm_bug.patch
mm-align-struct-page-more-aesthetically.patch
mm-de-indent-struct-page.patch
mm-remove-misleading-alignment-claims.patch
mm-improve-comment-on-page-mapping.patch
mm-introduce-_slub_counter_t.patch
mm-store-compound_dtor-compound_order-as-bytes.patch
mm-document-how-to-use-struct-page.patch
mm-remove-reference-to-pg_buddy.patch
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