Andrew, please drop procfs-detect-duplicate-names.patch and apply this
instead.
------------
[PATCH] proc: detect duplicate names on registration

From: Zhang Rui <[EMAIL PROTECTED]>

Print a warning if PDE is registered with a name which already exists in
target directory.

Bug report and a simple fix can be found here:
http://bugzilla.kernel.org/show_bug.cgi?id=8798

[\n fixlet and no undescriptive variable usage --adobriyan]
Signed-off-by: Zhang Rui <[EMAIL PROTECTED]>
Signed-off-by: Alexey Dobriyan <[EMAIL PROTECTED]>
---

 fs/proc/generic.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -518,6 +518,7 @@ static const struct inode_operations 
proc_dir_inode_operations = {
 static int proc_register(struct proc_dir_entry * dir, struct proc_dir_entry * 
dp)
 {
        unsigned int i;
+       struct proc_dir_entry *tmp;
        
        i = get_inode_number();
        if (i == 0)
@@ -536,6 +537,15 @@ static int proc_register(struct proc_dir_entry * dir, 
struct proc_dir_entry * dp
        }
 
        spin_lock(&proc_subdir_lock);
+
+       for (tmp = dir->subdir; tmp; tmp = tmp->next)
+               if (strcmp(tmp->name, dp->name) == 0) {
+                       printk(KERN_WARNING "PDE '%s' already registered\n",
+                               dp->name);
+                       dump_stack();
+                       break;
+               }
+
        dp->next = dir->subdir;
        dp->parent = dir;
        dir->subdir = dp;

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