The patch titled
Subject: proc-kpagecount-return-0-for-special-pages-that-are-never-mapped-v2
has been added to the -mm tree. Its filename is
proc-kpagecount-return-0-for-special-pages-that-are-never-mapped-v2.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/proc-kpagecount-return-0-for-special-pages-that-are-never-mapped-v2.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/proc-kpagecount-return-0-for-special-pages-that-are-never-mapped-v2.patch
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------------------------------------------------------
From: Anthony Yznaga <anthony.yznaga@xxxxxxxxxx>
Subject: proc-kpagecount-return-0-for-special-pages-that-are-never-mapped-v2
incorporate feedback from Matthew Wilcox
Link: http://lkml.kernel.org/r/1544481313-27318-1-git-send-email-anthony.yznaga@xxxxxxxxxx
Signed-off-by: Anthony Yznaga <anthony.yznaga@xxxxxxxxxx>
Acked-by: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Alexander Duyck <alexander.h.duyck@xxxxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Miles Chen <miles.chen@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/include/linux/page-flags.h~proc-kpagecount-return-0-for-special-pages-that-are-never-mapped-v2
+++ a/include/linux/page-flags.h
@@ -669,19 +669,18 @@ PAGEFLAG_FALSE(DoubleMap)
#define PAGE_TYPE_BASE 0xf0000000
/* Reserve 0x0000007f to catch underflows of page_mapcount */
+#define PAGE_MAPCOUNT_RESERVE -128
#define PG_buddy 0x00000080
#define PG_balloon 0x00000100
#define PG_kmemcg 0x00000200
#define PG_table 0x00000400
-#define PAGE_TYPE_ALL (PG_buddy | PG_balloon | PG_kmemcg | PG_table)
#define PageType(page, flag) \
((page->page_type & (PAGE_TYPE_BASE | flag)) == PAGE_TYPE_BASE)
static inline int page_has_type(struct page *page)
{
- return (PageType(page, 0) &&
- ((page->page_type & PAGE_TYPE_ALL) != PAGE_TYPE_ALL));
+ return (int)page->page_type < PAGE_MAPCOUNT_RESERVE;
}
#define PAGE_TYPE_OPS(uname, lname) \
_
Patches currently in -mm which might be from anthony.yznaga@xxxxxxxxxx are
tools-vm-page-typesc-fix-kpagecount-returned-fewer-pages-than-expected-failures.patch
proc-kpagecount-return-0-for-special-pages-that-are-never-mapped.patch
proc-kpagecount-return-0-for-special-pages-that-are-never-mapped-v2.patch
