GRU driver: minor updates

A few minor updates for the GRU driver.
	- documentation changes found in code reviews
	- changes to #ifdefs to make them recognized by "unifdef"
	  (used in simulator testing)
	- change GRU context load/unload to prefetch data

[akpm@linux-foundation.org: fix typo in comment]
Signed-off-by: Jack Steiner <steiner@sgi.com>
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/gru.h b/drivers/misc/sgi-gru/gru.h
index 40df7cb..f93f03a 100644
--- a/drivers/misc/sgi-gru/gru.h
+++ b/drivers/misc/sgi-gru/gru.h
@@ -30,9 +30,9 @@
 /*
  * Size used to map GRU GSeg
  */
-#if defined CONFIG_IA64
+#if defined(CONFIG_IA64)
 #define GRU_GSEG_PAGESIZE	(256 * 1024UL)
-#elif defined CONFIG_X86_64
+#elif defined(CONFIG_X86_64)
 #define GRU_GSEG_PAGESIZE	(256 * 1024UL)		/* ZZZ 2MB ??? */
 #else
 #error "Unsupported architecture"