The patch titled
kpagecount: add slab page checking because _mapcount is in a union
has been added to the -mm tree. Its filename is
kpagecount-added-slab-page-checking-because-of-_mapcount-in-union.patch
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------------------------------------------------------
Subject: kpagecount: add slab page checking because _mapcount is in a union
From: Petr Holasek <pholasek@xxxxxxxxxx>
Add a PageSlab() check before adding the _mapcount value to /kpagecount.
page->_mapcount is in a union with the SLAB structure so for pages
controlled by SLAB, page_mapcount() returns nonsense.
Signed-off-by: Petr Holasek <pholasek@xxxxxxxxxx>
Cc: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Cc: Matt Mackall <mpm@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/proc/page.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN fs/proc/page.c~kpagecount-added-slab-page-checking-because-of-_mapcount-in-union fs/proc/page.c
--- a/fs/proc/page.c~kpagecount-added-slab-page-checking-because-of-_mapcount-in-union
+++ a/fs/proc/page.c
@@ -40,7 +40,7 @@ static ssize_t kpagecount_read(struct fi
ppage = pfn_to_page(pfn);
else
ppage = NULL;
- if (!ppage)
+ if (!ppage || PageSlab(ppage))
pcount = 0;
else
pcount = page_mapcount(ppage);
_
Patches currently in -mm which might be from pholasek@xxxxxxxxxx are
kpagecount-added-slab-page-checking-because-of-_mapcount-in-union.patch
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