* [PATCH] kpagecount: added slab page checking because of _mapcount in union
@ 2010-12-16 17:10 Petr Holasek
0 siblings, 0 replies; only message in thread
From: Petr Holasek @ 2010-12-16 17:10 UTC (permalink / raw)
To: linux-kernel; +Cc: tiwai, akpm, Petr Holasek
PageSlab macro check was added before putting of _mapcount value
to /kpagecount. page->_mapcount is in union with SLAB structure
so for pages controlled by SLAB page_mapcount() returns nonsenses.
Signed-off-by: Petr Holasek <pholasek@redhat.com>
---
fs/proc/page.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/fs/proc/page.c b/fs/proc/page.c
index 3b8b456..b06c674 100644
--- a/fs/proc/page.c
+++ b/fs/proc/page.c
@@ -40,7 +40,7 @@ static ssize_t kpagecount_read(struct file *file, char __user *buf,
ppage = pfn_to_page(pfn);
else
ppage = NULL;
- if (!ppage)
+ if (!ppage || PageSlab(ppage))
pcount = 0;
else
pcount = page_mapcount(ppage);
--
1.7.2.3
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2010-12-16 17:10 [PATCH] kpagecount: added slab page checking because of _mapcount in union Petr Holasek
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