powerpc: use non-racy method for proc entries creation

Use proc_create()/proc_create_data() to make sure that ->proc_fops and ->data
be setup before gluing PDE to main tree.

Add correct ->owner to proc_fops to fix reading/module unloading race.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/powerpc/platforms/pseries/reconfig.c

@@ -512,12 +512,9 @@ static int proc_ppc64_create_ofdt(void)
 	if (!machine_is(pseries))
 		return 0;
 
-	ent = create_proc_entry("ppc64/ofdt", S_IWUSR, NULL);
-	if (ent) {
-		ent->data = NULL;
+	ent = proc_create("ppc64/ofdt", S_IWUSR, NULL, &ofdt_fops);
+	if (ent)
 		ent->size = 0;
-		ent->proc_fops = &ofdt_fops;
-	}
 
 	return 0;
 }