[PATCH] ppc64: fix enable_surveillance() for power5

On some platforms (notably power5) you can't enable surveillance
(firmware/service processor watchdog) from the kernel - you have to do
it in the firmware.

This patch changes enable_surveillance() to make the message that is
printed in this situation more informative.  Additionaly, the rtas_call
was changed to rtas_set_indicator so as to avoid having to handle
RTAS_BUSY returns.
Signed-off-by: Nathan Fontenot <nfont@austin.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ppc64/kernel/rtasd.c

@@ -343,15 +343,18 @@ static int enable_surveillance(int timeout)
 {
 	int error;
 
-	error = rtas_call(rtas_token("set-indicator"), 3, 1, NULL,
-			  SURVEILLANCE_TOKEN, 0, timeout);
+	error = rtas_set_indicator(SURVEILLANCE_TOKEN, 0, timeout);
 
-	if (error) {
-		printk(KERN_ERR "rtasd: could not enable surveillance\n");
-		return -1;
+	if (error == 0)
+		return 0;
+
+	if (error == RTAS_NO_SUCH_INDICATOR) {
+		printk(KERN_INFO "rtasd: surveillance not supported\n");
+		return 0;
 	}
 
-	return 0;
+	printk(KERN_ERR "rtasd: could not update surveillance\n");
+	return -1;
 }
 
 static int get_eventscan_parms(void)

include/asm-ppc64/rtas.h

@@ -22,12 +22,13 @@
 /* Buffer size for ppc_rtas system call. */
 #define RTAS_RMOBUF_MAX (64 * 1024)
 
-/* RTAS return codes */
-#define RTAS_BUSY		-2	/* RTAS Return Status - Busy */
-#define RTAS_EXTENDED_DELAY_MIN 9900
-#define RTAS_EXTENDED_DELAY_MAX 9905
+/* RTAS return status codes */
+#define RTAS_BUSY		-2    /* RTAS Busy */
+#define RTAS_NO_SUCH_INDICATOR	-3    /* No such indicator implemented */
+#define RTAS_EXTENDED_DELAY_MIN	9900
+#define RTAS_EXTENDED_DELAY_MAX	9905
 
-#define RTAS_UNKNOWN_OP		-1099	/* Return Status - Unknown RTAS Token */
+#define RTAS_UNKNOWN_OP		-1099 /* Unknown RTAS Token */
 
 /*
  * In general to call RTAS use rtas_token("string") to lookup