GRU Driver V3: fixes to resolve code review comments

Fixes problems identified in a code review:
	- add comment with high level dscription of the GRU
	- prepend "gru_" to all global names
	- delete unused function
	- couple of trivial bug fixes

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Jack Steiner <steiner@sgi.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/misc/sgi-gru/gruprocfs.c b/drivers/misc/sgi-gru/gruprocfs.c
index bdb1ad8..533923f 100644
--- a/drivers/misc/sgi-gru/gruprocfs.c
+++ b/drivers/misc/sgi-gru/gruprocfs.c
@@ -122,7 +122,7 @@
 
 static int options_show(struct seq_file *s, void *p)
 {
-	seq_printf(s, "0x%lx\n", options);
+	seq_printf(s, "0x%lx\n", gru_options);
 	return 0;
 }
 
@@ -136,7 +136,7 @@
 	    (buf, userbuf, count < sizeof(buf) ? count : sizeof(buf)))
 		return -EFAULT;
 	if (!strict_strtoul(buf, 10, &val))
-		options = val;
+		gru_options = val;
 
 	return count;
 }