[PATCH] oprofile: ppro: need to enable/disable all the counters

Need to enable/disable all the counters instead of just counter 0.

This affects all cpus with family=6, including i386/core.  Usual symptom:
only counter 0 provides samples.  Other counters don't produce samples.
Signed-off-by: Arun Sharma <arun.sharma@google.com>
Cc: Philippe Elie <phil.el@wanadoo.fr>
Cc: John Levon <levon@movementarian.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/i386/oprofile/op_model_ppro.c

@@ -138,11 +138,14 @@ static int ppro_check_ctrs(struct pt_regs * const regs,
 static void ppro_start(struct op_msrs const * const msrs)
 {
 	unsigned int low,high;
+	int i;
 
-	if (reset_value[0]) {
-		CTRL_READ(low, high, msrs, 0);
+	for (i = 0; i < NUM_COUNTERS; ++i) {
+		if (reset_value[i]) {
+			CTRL_READ(low, high, msrs, i);
 			CTRL_SET_ACTIVE(low);
-		CTRL_WRITE(low, high, msrs, 0);
+			CTRL_WRITE(low, high, msrs, i);
+		}
 	}
 }
 
@@ -150,11 +153,14 @@ static void ppro_start(struct op_msrs const * const msrs)
 static void ppro_stop(struct op_msrs const * const msrs)
 {
 	unsigned int low,high;
+	int i;
 
-	if (reset_value[0]) {
-		CTRL_READ(low, high, msrs, 0);
+	for (i = 0; i < NUM_COUNTERS; ++i) {
+		if (!reset_value[i])
+			continue;
+		CTRL_READ(low, high, msrs, i);
 		CTRL_SET_INACTIVE(low);
-		CTRL_WRITE(low, high, msrs, 0);
+		CTRL_WRITE(low, high, msrs, i);
 	}
 }