From: Thomas Tuttle <ttuttle@google.com>
Date: Fri, 6 Jun 2008 05:46:58 +0000 (-0700)
Subject: pagemap: return map count, not reference count, in /proc/kpagecount
X-Git-Tag: v2.6.26-rc6~40
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bbcdac0c20aa20d1daad41d9c138102b70e5aae4;p=linux-2.6

pagemap: return map count, not reference count, in /proc/kpagecount

Since pagemap is all about examining pages mapped into processes' memory
spaces, it makes sense for kpagecount to return the map counts, not the
reference counts.

Signed-off-by: Thomas Tuttle <ttuttle@google.com>
Cc: Matt Mackall <mpm@selenic.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index 32dc14cd89..5a16090a6d 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -726,7 +726,7 @@ static ssize_t kpagecount_read(struct file *file, char __user *buf,
 		if (!ppage)
 			pcount = 0;
 		else
-			pcount = atomic_read(&ppage->_count);
+			pcount = page_mapcount(ppage);
 
 		if (put_user(pcount, out++)) {
 			ret = -EFAULT;